Dr Nike Stam presents Maartje Draak Dublin Institute for Advanced Studies DIAS 2026-09-20 | Dr Nike Stam presents Maartje Draak
2024 11 22 SCS Statutory Public Lecture Barry J Lewis Dublin Institute for Advanced Studies DIAS 2024-12-12 | Léacht Reachtúil / Statutory Public LectureProfessor Barry J. LewisDosparthus yw y gerd, a barnu a ellir arnei: the Welsh bardic poet as literary criticThomas Davis Theatre, Arts Building, Trinity College, Dublin.
Mathematics & Physics: An Entangled Tango Dublin Institute for Advanced Studies DIAS 2024-12-12 | Statutory Public Lecture 2024Speaker: Yang-Hui HeAbstract: We invite the audience to enjoy that intricate dance between theoretical physics and pure mathematics over the centuries, how they are constantly feeding each other new ideas, whilst distinguishing between mathematical physics and physical mathematics. We shall focus especially on contemporary developments such as string theory, and why this attempt of unified theory of everything is still very much relevant.
Open House Dublin - DIAS Dunsink Observatory 2024 Dublin Institute for Advanced Studies DIAS 2024-12-06 | Open House Dublin is a free festival of architecture with 100+ tours, talks, lectures, workshops, podcasts and more across the city and county – brought to you by the Irish Architecture Foundation (https://openhousedublin.com).DIAS Dunsink Observatory (dunsink.dias.ie) has been a centre for astronomical research and public engagement in Ireland since its foundation in 1785.
Samhain agus Science 2024: Fin Whale Whispers Beneath your Feet Dublin Institute for Advanced Studies DIAS 2024-12-04 | Fin whales are the second largest animal on Earth and produce one of the loudest vocalisations in the animal kingdom. These sounds can be recorded with hydrophones deployed at sea, but it is a very challenging task and only limited information about migration and social structure of fin whale populations is currently available.We reveal that in some coastal regions human living spaces are ensonified by fin whale song, and that these vibrations can be recorded with relatively low-cost citizen science seismometers. This offers the potential to enhance public engagement with the oceans and presents new opportunities for global monitoring of fin whales.We envisage a new community of citizen scientists contributing to science-driven investigations on how climate change and increasing human pressure on the marine environment impact the migration patterns, welfare and changing social patterns of fin whales.**********Martin Möllhoff studied Geophysics in Cologne, Germany, and Galway. In 1999, he began working as a Technical Officer with the Geophysics Group at UCD, where he also pursued a PhD in seismology. He joined DIAS in 2015, becoming Director of Seismic Networks in 2018. Throughout his career, he has gained extensive experience in installing and managing seismic networks, often in remote and challenging environments. Martin’s primary research interests focus on environmental seismology, particularly in relation to volcanoes, ocean waves, water flow and whale calls.
Samhain agus Science 2024: How Space Spooks your Skeleton Dublin Institute for Advanced Studies DIAS 2024-11-15 | Skeletons do not like spaceflight. Microgravity effects on bone health and the rates of muscle loss are frightening. Therefore, huge energy and time investment goes into protecting astronauts' bones. This talk covered the human hazards of spaceflight and teach you how to take good care of your bones like an astronaut.**********This talk was given by Dr Lisa McNamee.Dr Lisa McNamee is a medical doctor with a special interest in aviation and space medicine. She holds honours degrees from Royal College of Surgeons in Ireland, Trinity College Dublin and an MSc from University College Dublin.She has completed the European Space Agency's space physician training course and the University of Texas Medical Branch Principles of Aviation and Space Medicine course. She is a co-founder of Space Medicine Ireland and is working on multiple space medicine research projects. She lectures in medicine and engineering and has published extensively in the academic and mainstream press.She won the Women's Aerospace Awards 2024 in the category of medicine and health. She received the Anita Mantri PhD Award in the field of Aerospace Medicine education, outreach and leadership. She was the winner of the 2024 Women in STEM Rising Star Award. She developed a free medical emergencies translation app, Fluent Medic, which is available on the App store.She is a podcast co-host for Irish Doctors for the Environment's Climate Conversations Podcast. She is the Outreach lead for the Women in Medicine in Ireland Network.Lisa is a passionate science communicator and space aficionado.**********Now in its seventh year, Samhain agus Science brings together researchers from DIAS and around the world for a series of free events that take inspiration from the Celtic festival of Samhain and look at the dark side of science.The festival aims to make the big scientific questions of our time and Celtic history relevant, accessible, and fun to a general audience who might not normally be familiar with these topics.
Samhain agus Science 2024: Christian Curses in Medieval Ireland Dublin Institute for Advanced Studies DIAS 2024-11-14 | Medieval Christians believed in the power of God, his saints, and his clergy to bless or curse their endeavours. Many of Ireland's most prominent saints, including St. Patrick, St. Adomnán of Iona, and Dublin's patron St. Lorcán Ó Tuathail, were celebrated or feared as champion cursers. This can sometimes be surprising, given the modern Christian emphasis on the biblical command to "bless them that persecute you: bless, and curse not."Why did medieval Christians believe in the power of their saints and priests to curse? How did such curses work? And what kinds of miraculous punishment did they believe those curses could bring about? This talk will explore the rich traditions of Christian curses and their associated beliefs in medieval Europe and Ireland.**********This talk was given by Dr. Jesse Patrick Harrington (below), a research fellow at the School of Celtic Studies, Dublin Institute for Advanced Studies. He has previously held a Government of Ireland Postdoctoral Fellowship at University College Cork and has been a visiting researcher at the Norwegian Institute in Rome, the Centre d'études supérieures de civilisation médiévale in Poitiers, and the Centre Culturel Irlandais in Paris on a fellowship awarded by the French Embassy in Dublin.His PhD at the University of Cambridge explored depictions of divine vengeance and saintly cursing in medieval England and Ireland, a theme on which he has widely published. His principal research project currently concerns St. Lorcán Ó Tuathail, twelfth-century archbishop and patron saint of Dublin, for which he is additionally advising the international octocentenary and nonocentenary commemorations planned in France and Ireland for 2025 and 2028.**********Now in its seventh year, Samhain agus Science brings together researchers from DIAS and around the world for a series of free events that take inspiration from the Celtic festival of Samhain and look at the dark side of science.The festival aims to make the big scientific questions of our time and Celtic history relevant, accessible, and fun to a general audience who might not normally be familiar with these topics.
Samhain agus Science 2024: Primordial Mountains and Dancing Giants Dublin Institute for Advanced Studies DIAS 2024-11-14 | Presented by Dr. Sysky Rӓsӓnen (University of Helsinki)
Samhain agus Science 2024: Spooky Space Weather and the Halloween Storm Dublin Institute for Advanced Studies DIAS 2024-11-13 | In this talk, Alexandra discusses the “winds”, “storms” and “rains” of Earth’s Space Weather.Starting at the centre of the Solar System, where the Sun’s atmosphere bubbles and streams out. This solar “wind” crashes into planets throughout the solar system, driving “stormy” conditions which in turn drive all kinds of dynamics. Alexandra explored the famous Halloween space weather storm of 2003, and its impacts on human technology.Finally, particles which “rain” down on the Earth’s atmosphere dramatically drive the Earth’s aurora: it’s Northern and Southern lights, she discussedimages of the aurora as seen from Ireland.**********Dr Alexandra Ruth FoggAlexandra is a Space Scientist working at DIAS Dunsink Observatory, a site of historical significance in Irish (and international) astronomy. She has always been passionate about science, technology, engineering and mathematics (STEM), and so completed her Physics degree with a specialism in space science and technology at the University of Leicester in 2016. With a passion for space physics, Alexandra completed a PhD on Earth’s Space Weather in 2020, which was a springboard for a career in space science.Since 2020, Alexandra has worked in Dublin, researching primarily Earth’s Space environment and Space Weather through many different avenues. She has also explored similarities and differences with the space environments of different planets of the solar system.**********Now in its seventh year, Samhain agus Science brings together researchers from DIAS and around the world for a series of free events that take inspiration from the Celtic festival of Samhain and look at the dark side of science.The festival aims to make the big scientific questions of our time and Celtic history relevant, accessible, and fun to a general audience who might not normally be familiar with these topics.
Non-Linear Dynamics of Frustrated Magnets Dublin Institute for Advanced Studies DIAS 2024-11-13 | Speaker: Ciarán Hickey (UCD)Abstract: Many of the most important and widespread techniques in use today in probing many-body systems can be understood within the framework of linear response. However, though incredibly powerful, in some cases linear response can be simply blind to the underlying physics at play, unable to distinguish between different potential possibilities. One of the most exciting recent developments in pushing beyond this linear response regime has been the advent of non-linear spectroscopy as a tool to study quantum many-body systems. In this talk, I will discuss how non-linear response can be used to reveal new information about frustrated quantum magnets.
Defects and Interfaces in the O(N) Model Dublin Institute for Advanced Studies DIAS 2024-11-13 | Speaker: Sabine Harribey (DIAS)Abstract: Introducing defects for O(N) critical models has recently sparked much interest. Indeed, from a theoretical point of view defects give rise to new universality classes of 3D CFTs that can often be studied analytically. Defects can also describe physical impurities or finite-size effects that can be realised experimentally. In this talk, I will first review line defects and surface defects in the O(N) model. I will then present another approach through interfaces with localised cubic interactions perturbing a quartic multi-scalar model. We computed the one-loop beta functions and then looked for fixed points both analytically and numerically for different bulk symmetries. We found a large landscape of fixed points breaking the bulk symmetry to various subgroups
Loop Quantum Gravity and Quantum Information Dublin Institute for Advanced Studies DIAS 2024-11-04 | Speaker: Eugenio Bianchi (Penn State University)Abstract: I will give a brief introduction to key aspects of loop quantum gravity, using the quantum polyhedron as a model system. Then I will discuss how the entanglement entropy of geometric observables provides a probe of locality and semiclassicality of quantum states of the geometry.
Decoding the Physics of the Early Universe Through Primordial Black Holes, Dark Matter & GWs Dublin Institute for Advanced Studies DIAS 2024-10-22 | Speaker: Riajul Haque (Indian Statistical Institute Kolkata)Abstract: I will start my talk with a brief overview of the standard reheating scenario. Then, I will discuss reheating through the evaporation of primordial black holes (PBHs) if one assumes PBHs are formed during the reheating phase. Depending on their initial mass, abundance, and inflaton coupling with the radiation, I discuss two physically distinct possibilities of reheating the universe. In one possibility, the thermal bath is solely obtained from the decay of PBHs, while inflaton plays the dominant energy component in the entire process. In the other possibility, PBHs dominate the total energy budget of the universe during evolution, and then their subsequent evaporation leads to a radiation-dominated universe. I will discuss the impact of monochromatic and extended PBH mass functions and estimate the detailed parameter ranges for realizing those distinct reheating histories. The evaporation of PBHs is also responsible for the production of DM. I will show its parameters in the background of reheating obtained from two chief systems in the early universe: the inflaton and the primordial black holes (PBHs). Then, I will move my discussion towards decoding the very early universe physics through GWs, where initially, I will focus on the primordial gravitational waves (PGWs), the tensor perturbation without any source term. If PBHs are produced due to the enhancement of the primordial scalar power spectrum on small scales, such primordial spectra also inevitably lead to strong amplification of the scalar-induced secondary gravitational waves (GWs) at higher frequencies. I will show how the recent detection of the stochastic gravitational wave background (SGWB) by the pulsar timing arrays (PTAs) has opened up the possibility of directly probing the very early universe through the scalar-induced secondary gravitational waves. Finally, I will conclude my talk by elaborating on the effect of quantum correction on the Hawking radiation for ultra-light PBHs and its observational signature through dark matter and gravitational waves.
Are Entropy Bounds Epistemic? Dublin Institute for Advanced Studies DIAS 2024-10-11 | Speaker: Emily AdlamAbstract: Entropy bounds have played an important role in the development of holography as an approach to quantum gravity. In this talk I will discuss several interpretations of the covariant entropy bound. I observe that there is a possible way of thinking about the covariant entropy bound which would suggest that it encodes an epistemic limitation rather than an objective count of the true number of degrees of freedom on a light-sheet; thus I distinguish between ontological and epistemic interpretations of the covariant bound. I will consider the consequences that these interpretations might have for physics and we discuss what each approach has to say about gravitational phenomena. Finally, I will consider what existing knowledge about entanglement entropies can tell us about this question.
Thermodynamics as a Tool for (Quantum) Gravitational Dynamics Dublin Institute for Advanced Studies DIAS 2024-10-07 | Speaker: Marek Liška (DIAS)Abstract: Since the seminal work of T. Jacobson, it has been known that thermodynamics of local causal horizons encodes equations governing gravitational dynamics. I discuss how this thermodynamic perspective can improve our understanding of gravity. I first argue that the classical dynamics implied by thermodynamics correspond to unimodular (Weyl transverse) gravity rather than to general relativity. In the second part of the talk, I then show how thermodynamics of local causal horizons may allow us to study the low energy quantum gravitational effects and discuss its implications in several different regimes.
Newgrange and JWST: Humanitys Enduring Quest to Understand the Universe Dublin Institute for Advanced Studies DIAS 2024-10-02 | Despite being separated by millennia, both Newgrange and JWST underscore humanity's enduring quest to understand our place in the cosmos through the study of the stars and the universe.This talk was delivered by Dr. Frank Prendergast, archaeoastronomer and Emeritus Research Fellow at Technological University Dublin, and Professor Gillian Wright, European Principal Investigator of MIRI and Director of the UK Astronomy Technology Centre in Edinburgh.
A Simple Axiom for Euclidean Quantum Field Theory Dublin Institute for Advanced Studies DIAS 2024-09-20 | Speaker: Werner Nahm (DIAS)Abstract: Mathematical interest in quantum field theory washampered by the lack of a definition that mathematicians couldremember. Here is one: A unitary euclidean quantum field theoryis a functor from a category of Riemannian manifolds (with boundaries)to a category of Hilbert spaces (with linear maps). In thenon-unitary case, the latter have to be generalized to spaces of self-dualBanach spaces. In the unitary case, the natural properties of thecategories (continuity, monoidal structure, self-adjointness)are supposed to be respected by the functor.The talk will explain, how the usual physics emerges fromthis axiom.
Numerical Relativity in Effective Field Theories of Gravity Dublin Institute for Advanced Studies DIAS 2024-09-19 | Speaker: Aaron Held (Ecole Normale Supérieure)Abstract: The age of gravitational-wave astronomy is now in full swing. For the first time, we gain observational access to the highly dynamical strong-field regime of the gravitational interaction. Constraining potential deviations from General Relativity (GR) requires reliable waveform predictions, not just in GR, but also when higher curvature corrections contribute to the dynamics. I will present an overview of recent progress on (i) mathematical well-posedness, (ii) physical time evolution in the presence of ghosts, and (iii) resulting numerical nonlinear waveforms. In combination, the above constitutes a feasible pathway to use current and future gravitational-wave observations to constrain effective field theories of gravity.
Learning Theory-Informed Priors for Bayesian Inference: A Case Study with Early Dark Energy Dublin Institute for Advanced Studies DIAS 2024-09-18 | Speaker: Michael Toomey (MIT)Abstract: Cosmological models are often formulated in the language of particle physics, using quantities like the axion decay constant, but tested against data using physical quantities such as energy density ratios, with uniform priors assumed on these quantities. This standard approach overlooks important theory-driven priors, including constraints from fundamental physics, like particle physics and string theory, which often favor sub-Planckian axion decay constants. In this talk, I will present a novel method for learning theory-informed priors for Bayesian inference using normalizing flows (NF), a flexible generative machine learning technique. NFs allows us to generate priors on model parameters in cases where analytic expressions are unavailable or difficult to compute. I’ll demonstrate this technique with an application to early dark energy (EDE), a model that has gained attention in the context of the Hubble tension. First, I’ll validate our NF-based approach using the limited theory-based constraints available for EDE, and then, leveraging the computational efficiency of NFs, I’ll showcase how we achieve some of the most stringent constraints on EDE when incorporating large-scale structure likelihoods. This talk will highlight the versatility of NFs in Bayesian inference in cosmology (and beyond) and how NFs and other generative machine learning techniques can help bridge the gap between theoretical models and data analysis.
Summer Students - Final Presentations : Part 2 Dublin Institute for Advanced Studies DIAS 2024-09-10 | Speakers: Beth Campbell, Patrick Gormley & Luke JohnsonTitle: Demonstrating Perfect Quantum State Transfer Through A Chaotic Spin ChainSpeaker: Tomas GillandersTitle: Exploring Unlinkings of Symmetric Quivers & Permutohedra
Summer Students - Final Presentations : Part 1 Dublin Institute for Advanced Studies DIAS 2024-09-10 | Speakers: Matthew Blakeney, Tim Daly & Jack Murphy Title: Hamiltonian Monte Carlo Simulations of the BFSS Matrix ModelSpeaker: Benjamin Clark Title: Changing the Fundamental Constants of the UniverseSpeakers: Adam Luddy, Colm McElwain & James Kilcoyne
Primordial Black Holes from Stochastic Inflation Dublin Institute for Advanced Studies DIAS 2024-09-10 | Speaker: Syksy Rasamen (University of Helsinki)Abstract: Primordial black holes are a longstanding candidate for dark matter. I will discuss how to generate their seeds from inflation, and how stochasticity can enhance the black hole abundance by orders of magnitude.
Gravitational Waves as a Probe of the Early Universe Dublin Institute for Advanced Studies DIAS 2024-09-10 | Speaker: Valerie Demcke (CERN)Abstract: Due to their extremely weak interactions, gravitational waves are a very promising, but also challenging, probe of the early Universe. In this talk I will review the status of gravitational wave searches across different frequency bands, including the growing evidence for a stochastic gravitational wave background at pulsar timing arrays and data analysis challenges in next-generation interferometers. I will also discuss new ideas to search for gravitational waves at MHz and GHz frequencies.
Precise Predictions and New Insights for the Migdal Effect Dublin Institute for Advanced Studies DIAS 2024-07-26 | Speaker: Matthew Dolan (University of Melbourne)Abstract: The scattering of neutral particles by an atomic nucleus can lead to electronic ionisation and excitation through a process known as the Migdal effect. I will describe the necessity of revisiting previous calculations to provide more accurate predictions which allow for large nuclear recoil velocities and incorporate the effects of multiple ionisation. These results are relevant for dark matter direct detection searches, as well as ongoing experiments involving neutron sources.I will also discuss the sensitivity of the HydroX proposal to dope the LZ experiment with hydrogen using the Migdal effect. HydroX could have sensitivity to dark matter masses as low as 5 MeV for both spin-independent and spin-dependent scattering, with XLZD extending that reach to lower cross sections. This technique would substantially enhance the sensitivity of direct detection to spin-dependent proton scattering, well beyond the reach of any current experiments.
Fluid Dynamics, Edge Modes and All That Dublin Institute for Advanced Studies DIAS 2024-07-26 | Speaker: Parameswaran Nair (CUNY, New York)Abstract: I will describe a formulation of fluid dynamics in terms of co-adjoint orbits in group theory and use it to analyze the effects of anomalies, spin-orbit coupling, etc. Then I will describe how to analyze the dynamics of color charges using edge modes in nonabelian gauge theories and how this leads to equations for color flows in QCD.
Precise Predictions and New Insights for the Migdal Effect Dublin Institute for Advanced Studies DIAS 2024-07-05 | Speaker: Matthew Dolan (University of Melbourne)Abstract: The scattering of neutral particles by an atomic nucleus can lead to electronic ionisation and excitation through a process known as the Migdal effect. I will describe the necessity of revisiting previous calculations to provide more accurate predictions which allow for large nuclear recoil velocities and incorporate the effects of multiple ionisation. These results are relevant for dark matter direct detection searches, as well as ongoing experiments involving neutron sources.I will also discuss the sensitivity of the HydroX proposal to dope the LZ experiment with hydrogen using the Migdal effect. HydroX could have sensitivity to dark matter masses as low as 5 MeV for both spin-independent and spin-dependent scattering, with XLZD extending that reach to lower cross sections. This technique would substantially enhance the sensitivity of direct detection to spin-dependent proton scattering, well beyond the reach of any current experiments.
Learning 4-Dimensional Knot Invariants from the Jones Polynomial Dublin Institute for Advanced Studies DIAS 2024-06-18 | Speaker: Mark Hughes (Brigham Young University)Abstract: Machine learning techniques have proven to be effective in knottheory, identifying subtle relationships between topological invariants andfinding optimal solutions to problems with large intractable search spaces. In this talk I will outline the current state of affairs of machine learning inknot theory, and discuss problems of learning certain 4-dimensional topological invariants (like the slice genus, Khovanov homology, and the Rasmussen s-invariant) from the Jones polynomial. I will discuss what these results suggest about the underlying structure of these 4D invariants, and identify new lines of approach for studying knot theory via machine learning.
Are Supermassive Black Holes Primordial? Dublin Institute for Advanced Studies DIAS 2024-06-04 | Speaker: Christian Byrnes (University of Sussex)Abstract: Black holes with masses between a million and a billion solar masses are seen in the centres of many galaxies, even at high redshift. Their origin remains unknown and hard to explain, raising the possibility that these black holes are primordial rather than astrophysical. I will discuss the motivation for this scenario and the difficulty in finding a working model of the early universe (e.g. inflation) which can generate them. In particular, I will discuss the CMB spectral distortions which tightly constrain non-standard initial conditions on the relevant length scale for supermassive black holes.
Mary Mulvihill Award 2024 - Highly Commended Award : Róisín Ferguson Dublin Institute for Advanced Studies DIAS 2024-05-27 | Róisín Ferguson, who has just completed a degree in genetics in TCD, took the ostensibly brainlessscarecrow from the Wizard of Oz as the starting point for an ambitious exploration of the relatedconcepts of intelligence and cognition—and the relationship of both to the brain and to morerudimentary information processing systems in “aneural organisms”, such as worms, plants, andmicrobes, which do not possess a brain. Her entry comprised an audio essay and a recorded interview with Dr. Kevin Mitchell, Associate Professor of Neurobiology and Genetics at TCD.TCD student Róisín Ferguson, who is from Dublin, has just completed a degree in genetics. Herdegree project involved the genetic analysis of DNA isolated from the teeth of mesolithic settlers that were found at the Killuragh archaeological site in County Limerick. A regular contributor to Trinity News, she was also nominated for the 2024 SFI Award for Journalism relating to Science &Technology, as part of the National Student Media Awards.
Mary Mulvihill Award 2024 Dublin Institute for Advanced Studies DIAS 2024-05-27 | https://marymulvihillaward.ie/award/The theme of this year’s competition is ‘Intelligence’.
Universal Electromagnetic Properties of Strongly-coupled Electron-phonon Superconductors Dublin Institute for Advanced Studies DIAS 2024-05-15 | Speaker: Joshuah T. Heath (Dartmouth College, New Hampshire)Abstract: High-temperature superconductors are characterized by exotic normal states, and are still a subject of intense study nearly four decades after their introduction. A formal attempt to uniquely determine high-Tc behavior is given by Homes law: namely, that there is a linear relationship between T=0 superconducting ground-state properties and the T=Tc normal-phase DC conductivity. Homes law has been shown to work in the conventional (i.e., BCS) dirty limit, and remains a mostly empirical relation with an ill-defined origin. In this talk, I will outline theoretical and numerical work done on universal scaling relations in the context of electron-phonon superconductors described by Eliashberg theory. We find that Homes scaling is independent of both a high-Tc pairing mechanism and dirty BCS-like physics, and is instead a consequence of a non-Galilean invariant interaction. In the asymptotically strong limit, the Eliashberg equations reduce to a universal theory described by an Einstein spectrum, in which case we can make universal statements about scaling relations and the electromagnetic properties of strongly coupled electron-phonon superconductors. In this way, Homes scaling is shown to be a fundamental result in a wide class of superconducting compounds, and challenges the colloquial definition of “conventional” superconductivity.
Search for Cosmic Strings Through Their Gravitational Wave Signals Dublin Institute for Advanced Studies DIAS 2024-05-12 | Speaker: Marek Lewicki (University of Warsaw)Abstract: We are currently witnessing the dawn of a new era in astrophysics and cosmology, started by the LIGO/Virgo observations of Gravitational Waves (GWs). In this talk I will discuss prospects for detection of GW signals from cosmic strings with the upcoming next generation next generation of experiments and their current status in light of the recent data from pulsar timing arrays.
From Classical to Quantum Fields on Causal Sets Dublin Institute for Advanced Studies DIAS 2024-05-12 | Speaker: Christoph Minz (University of Leipzig)Abstract: In this talk, I will give a brief review of algebraic classical and quantum field theory on causal sets. There are different approaches to quantise the classical fields, of which we consider deformation quantisation and geometric quantisation over the symplectic space of the classical field data that is equipped with an inner product. For a free scalar field on a causal set, I show how to define a state associated to the corresponding quantisation map that turns out to be the Sorkin-Johnston state. The geometric construction suggests a natural generalization to less linear examples, such as interacting fields, which is subject to an ongoing project. The main results are based on my PhD project with Eli Hawkins and Kasia Rejzner (arXiv:2207.05667
CATCH22+2 2024-05-05 Dublin Institute for Advanced Studies DIAS 2024-05-08 | https://indico.cern.ch/event/1291893/timetable/?view=standard#day-2024-05-05(00:00:00) Prof. Cliff Burgess - The Gravity of Particle Physics (Naturally)(00:21:24) Prof. Stefano Profumo - The Primordial Black Holes Variations(00:41:07) Dr. Syksy Räsänen - Primordial black holes from stochastic inflation(00:56:54) Dr. Sachiko Kuroyanagi - Searching new physics via features of the stochastic gravitational wave background(01:16:28) Dr. Ghazal Geshnizjani - On the initial singularity and extendibility of flat quasi-de Sitter spacetimes(01:33:29) Dr. Enrico Maria Sessolo - Naturally small neutrino mass from asymptotic safety(01:51:11) Dr. Gianluca Calcagni - Imminent test of quantum gravity with gravitational waves(02:07:43) Dr. Qiuyue Liang - Test parity violation signal from stochastic gravitational wave background(02:24:17) Dr. Francesco Costa - Freeze-in at stronger coupling and the highest temperature in the Universe(02:38:27) Dr. Maeve Madigan - Hide and seek: how PDFs can conceal new physics(02:53:05) Dr. Aidin Masouminia - BSM parton showers in Herwig 7(03:12:51) Dr. Kateryna Radchenko Serdula - Impact of Loop Corrections to the Trilinear Higgs Couplings and Interference Effects on Experimental Limits(03:27:30) Dr. Ken Mimasu - Indirect new physics constraints with 1,2 and 3 bosons(03:45:00) Prof. Jonathan R. Ellis - Review talk: state-of-the-art of the field(04:11:29) Dr. Venus Keus - Closing session + competition results and prizes
CATCH22+2 2024-05-04 Dublin Institute for Advanced Studies DIAS 2024-05-08 | https://indico.cern.ch/event/1291893/timetable/?view=standard#day-2024-05-04(00:00:00) Prof. Mariano Quiros Carcelen - Dark branes for PTA signal and dark matter(00:18:35) Prof. Michael Spira - Pair production of Higgs Bosons at NLO(00:35:41) Prof. Milada Muhlleitner - Precision Calculations in the Next-to-Minimal Supersymmetric Standard Model (NMSSM) and Phenomenological Implications(00:54:29) Dr. Kamila Kowalska - Entanglement in flavored scattering(01:12:08) Prof. Gustavo Branco - Aspects of Models with Vector-like Quarks(01:34:49) Dr. Claudia Hagedorn - Phenomenological aspects of flavour (and CP) symmetries(01:55:30) Prof. Apostolos Pilaftsis - Natural Alignment and CP Violation Beyond the Standard Model(02:14:37) Prof. Per Osland - Properties of the Weinberg 3HDM potential(02:32:05) Prof. Margarida Nesbitt Rebelo - Complex S3-symmetric 3HDM(02:55:04) Prof. Bohdan Grzadkowski - Semisymmetries in 2HDM(03:16:06) Dr. Peter Matak - Cutting rules and unitarity constraints for CP asymmetric processes(03:30:17) Dr. Seyda Ipek - QCD Baryogenesis(03:49:58) Prof. Nausheen Shah - Deconstructing Flavor: The Privately Democratic Higgs(04:05:49) Prof. Marta Losada - Flavor of a light charged Higgs(04:23:07) Dr. Jaana Heikkilae - SUSY searches at CMS(04:39:53) Dr. Tania Natalie Robens - Physics with singlets(04:55:56) Prof. Stefano Moretti - Composite 2HDM at the LHC: Single & Double Higgs(05:16:29) Prof. Antonio Delgado - Quo Vadis DM?(05:32:12) Dr. Jeff Dror - The Fluctuating Spacetime of Dark Matter(05:48:56) Dr. Lisa Biermann - Tracking Minima, Phase Transitions and Gravitational Waves with BSMPTv3
CATCH22+2 2024-05-03 Dublin Institute for Advanced Studies DIAS 2024-05-07 | https://indico.cern.ch/event/1291893/timetable/?view=standard#day-2024-05-03(00:00:00) Prof. Michael Ramsey-Musolf - How Viable Is Electroweak Baryogensis ?(00:20:24) Prof. Stephen Frederick King - Gravitational Waves as Probes of New Physics(00:39:53) Prof. Germano Nardini - Probing first-order phase transitions at LISA(01:01:35) Prof. Kimmo Juhani Kainulainen - Transport equations for electroweak baryogenesis(01:21:48) Prof. Paula Chadwick - Gamma-ray Astronomy: a Unique Probe of the Universe(01:41:07) Prof. Aleksi Vuorinen - Neutron stars as a laboratory for particle and nuclear physics(02:00:36) Dr. Nataliya Porayko - Chasing dark matter with pulsar experiments(02:19:39) Dr. Cristina Mondino - Axion screening of the CMB(02:38:37) Prof. Peter Gallagher - History of Dunsink(02:57:18) Prof. Marieke Postma - Sourcing electroweak baryogenesis(03:15:37) Prof. Shinya KANEMURA - Exploring loop-induced first order electroweak phase transition in the Higgs effective field theory(03:32:21) Prof. Sven Heinemeyer - Signs for a FOEWPT at the LHC?!(03:51:05) Prof. Rikard Enberg - First-order electroweak phase transition in the SMEFT(04:07:49) Dr. Jose Miguel No - Baryogenesis from transient CP violation in the early Universe(04:25:08) Prof. Manfred Lindner - Hierarchies and conformal UV completions(04:41:10) Prof. Diego Aristizabal - Coherent Elastic neutrino-Nucleus Scattering with directional detectors(04:58:48) Dr. Mariam Tórtola - Constraining BSM neutrino physics with CEvNS
CATCH22+2 2024-05-02 Dublin Institute for Advanced Studies DIAS 2024-05-03 | https://indico.cern.ch/event/1291893/timetable/?view=standard#day-2024-05-02(00:00:00) Prof. Patrizia Azzi - BSM at FCC(00:19:57) Prof. Alicia Calderon Tazon - Higgs+DM searches in CMS(00:36:55) Dr. Jana Schaarschmidt - Searches for Higgs boson pair production at ATLAS(00:51:56) Dr. Djuna Croon - Constraints and probes of dark matter objects(01:14:03) Prof. Enrico Nardi - Can the QCD axion feed a dark energy component?(01:30:33) Prof. Alejandro Ibarra - Connecting the baryons to the dark matter of the Universe(01:47:48) Prof. Belen Gavela - CP violation with ALPs and with singlet scalars(02:05:00) Prof. Francesco D'Eramo - Back to the phase space: thermal axions(02:21:55) Dr. Miguel Vanvlasselaer - Photo production from anomaly terms in supernovae and neutron stars(02:41:00) Prof. Jose Ramon Espinosa Sedano - Applications of the Tunneling Potential Formalism(02:59:15) Dr. Oliver Gould - Bubble nucleation for cosmological phase transitions(03:15:54) Dr. Xander Nagels - Criterion for ultra-fast bubble walls: the impact of hydrodynamic obstruction(03:29:40) Dr. Marek Lewicki - Search for cosmological phase transitions through their gravitational wave signals(03:47:42) Dr. Anne-Katherine Burns - PRyMordial: The first minutes of the universe, computed in seconds(04:05:01) Prof. Arttu Rajantie - Stochastic effective theory for scalar fields in de Sitter spacetime(04:27:24) Dr. Chris Dessert - Cosmic Axiverse Background(04:42:36) Dr. Patrick Stengel - Contributions to N_eff from freeze-in production of light relics
CATCH22+2 2024-05-01 Afternoon Sessions Dublin Institute for Advanced Studies DIAS 2024-05-02 | https://indico.cern.ch/event/1291893/timetable/?view=standard#day-2024-05-01(00:00:00) Prof. Tesla Jeltema - Astrophysical Probes of Self-Interacting Dark Matter(00:18:17) Prof. Maria Martinez - Status and Future Prospects of the search for Dark Matter Annual Modulation in NaI(00:34:40) Dr. Valentina De Romeri - Light vector mediators at direct detection experiments(00:51:11) Dr. Cristobal Padilla Aranda - The Euclid mission: scientific forecast, overview and status(01:11:16) Dr. Neda Darvishi - Sub-GeV Dark Matter Searches with QUEST-DMC(01:29:22) Prof. Howard Haber - Classes of complete dark photon models constrained by Z-Physics(01:51:13) Dr. Zoltán Péli - Exclusion bounds for Z' bosons(02:07:26) Dr. Avelino Vicente - Tri-unification: a separate SU(5) for each fermion family(02:26:23) Dr. Gabriela Lichtenstein - Lepton-flavour-violating constraints from triality(02:44:46) Prof. Richard Ruiz - Precision Neutrino DIS at CERN's Forward Physics Facility (and Beyond)
CATCH22+2 2024-05-01 Morning Sessions Dublin Institute for Advanced Studies DIAS 2024-05-01 | https://indico.cern.ch/event/1291893/timetable/?view=standard#day-2024-05-01(00:00:00) Dr. Eucharia - Meehan History of DIAS(00:13:54) Prof. Sinead Ryan - Ireland in CERN(00:29:41) Prof. Susan Gascon-Shotkin - Searches for additional low-mass Higgs bosons at the LHC(00:53:57) Dr. Joany Manjarres - Testing the Electroweak Theory with multi-boson polarization measurements(01:15:17) Prof. Jeonghyeon Song - Diphoton jet signals from light fermiophobic Higgs boson at the HL-LHC(01:34:46) Prof. Mikhail Shaposhnikov - Cosmic Matter-Antimatter Separation and Sterile Neutrino Dark Matter(01:55:32) Prof. Raymond Volkas - Two ideas in dark matter model building(02:16:14) Prof. Michel Tytgat - Light from darkness : history of a hot dark sector(02:38:33) Prof. Stefania De Curtis - Collider-cosmology synergy for strong dynamics signals(02:59:07) Prof. Matthew Dolan - Precise Predictions and New Insights for the Migdal Effect
Flavour Puzzles and the LHCb Experiment Dublin Institute for Advanced Studies DIAS 2024-04-18 | Speaker: Marcel Merk (Nikhef, Amsterdam)Abstract: Why is there no antimatter in the universe and why does nature provide us with three generations of similar fundamental fermions? These so-called flavour puzzles are among the most intriguing mysteries in particle physics. In the seminar we will discuss the origin of CP violation in the Standard Model and review highlights of CP violating measurements performed by the LHCb experiment. Finally, I will present recent results on the so-called flavour anomalies.
Flavour Puzzles and the LHCb Experiment Dublin Institute for Advanced Studies DIAS 2024-04-18 | Speaker: Marcel Merk (Nikhef, Amsterdam)Abstract: Why is there no antimatter in the universe and why does nature provide us with three generations of similar fundamental fermions? These so-called flavour puzzles are among the most intriguing mysteries in particle physics. In the seminar we will discuss the origin of CP violation in the Standard Model and review highlights of CP violating measurements performed by the LHCb experiment. Finally, I will present recent results on the so-called flavour anomalies.
Covariant Loop Quantum Gravity and Cosmology Dublin Institute for Advanced Studies DIAS 2024-04-18 | Speaker: Francesca Vidotto (Western University, Ontario)Abstract: The covariant formulation of Loop Quantum Gravity dynamics, referred also as Spinfoam, provides currently the most complete formulation for a non-perturbative theory of quantum gravity. It is a formulation of the gravitational path integral as a discrete sum over geometries: it gives well defined transition amplitudes in 4-dimensional Lorentzian spacetime, possibly formulated also with a positive cosmological constant, that have General Relativity as their classical limit. The conceptual and computational progresses in the covariant framework of LQG have brought a number of results in its application to cosmology. In this talk I highlight some of the most interesting steps forward in spinfoam cosmology. I briefly review the general assumption in defining the cosmological model. I focus then on the development of a novel strategy to compute cosmological primordial correlations and entanglement entropy. I also discuss the current understanding of the singularity resolution and the cosmological bounce from the covariant perspective.
Frame PB-groupoid of a VB-groupoid Dublin Institute for Advanced Studies DIAS 2024-04-04 | Speaker: Alfonso Garmendia (I’Institut d’Estudis Catalans, Barcelona)Abstract: Principal bundles are essential objects in gauge theories. A basic example of a principal bundle is the frames (or pointwise ordered basis) of a vector bundle on a manifold. Using this principal bundle one can relate geometric connections, reduction and different structures on the underlying manifold. In this talk, we explore properties of some special principal bundle. This is the set of some frames on the tangent vector bundle TG, where G is not only a manifold, but the space of arrows of a Lie groupoid, i.e. TG is a (vector bundle or) VB groupoid. This principal bundle will also be a PB groupoid.
Correlations, Representations and the Emergence of Spacetime Dublin Institute for Advanced Studies DIAS 2024-03-25 | Speaker: Achim Kempf (University of Waterloo & Perimeter Institute)Abstract: There are reasons to expect that spacetime might change dimension at sufficiently high energies or at least that, at energies as high as the Planck scale, spacetime might emerge from an essentially non-geometric structure. The question is, how the phenomena of the emergence of spacetime, and possibly also its change(s) of dimension, could be described mathematically. I am proposing that the physics of the emergence of spacetime, and possible dimension change, could correspond to a mathematical structure that possesses different mathematical representations in different regimes. In the concrete approach that I will present, the number of spacetime dimensions is found to be determined by the balance of a generalized bosonic pull and a fermionic push. This balance depends on the number of bosonic and fermionic species present at a given mass scale, which then accounts for the changing of dimensions with energy and also allows for non-geometric regimes. The proposed approach is entirely information theoretic.
New Physics: Where Do We Stand? Dublin Institute for Advanced Studies DIAS 2024-03-25 | Speaker: Veronica Sanz (University of Valencia)Abstract: This talk will be a discussion of our long-standing search for new phenomena in High-Energy Physics. We will describe the current situation, a decade after the Higgs discovery, and talk about the good ideas that died, the ones that are still standing, and our hopes for the future.
Dark Energy with a Little Help from its Friends (and why it might need somebody) Dublin Institute for Advanced Studies DIAS 2024-03-07 | Speaker: Susha Parameswaran (University of Liverpool)Abstract: I will give a (somewhat biased) overview of the current ideas for Dark Energy in String Theory; the insights they hope to give us into quantum gravity itself, their connections with experiments and observations, and the challenges that need to be overcome. I will then focus on some string-inspired scenarios for Dark Energy, in which simple coupled Dark Sectors help to overcome the challenges of vanilla constructions, with potentially observable consequences.
Green Functions for Black Hole Spacetimes: Wave Propagation/Self-Force/Stability/Quantum Properties Dublin Institute for Advanced Studies DIAS 2024-03-07 | Speaker: Marc Casals (University of Leipzig)Abstract: Field perturbations of black hole spacetimes satisfy a wave equation, for which crucial objects are its classical (e.g., retarded) and quantum (e.g., Feynman) Green functions. In this talk, we will discuss some mathematical properties of Green functions in Schwarzschild and Kerr black hole spacetimes, such as their global singularity structure, their Fourier modes and wave propagation properties. We will also present some physical applications of these Green functions to the late-time stage (ringdown) of gravitational waveforms, self-force problem for modelling black hole inspirals, black hole stability properties and quantu
Three-dimensional Massive Gravity and the Fractional Quantum Hall Effect Dublin Institute for Advanced Studies DIAS 2024-02-22 | Speaker: Eric Bergshoeff (Groningen University)Abstract: In this talk I will compare the massive spin-2 modes that have been observed in the Fractional Quantum Hall effect with the Fierz-Pauli description of massive spin-2 modes in quantum field theory. Subsequently, I will discuss the generalization to massive higher-spin modes both in the Fractional Quantum Hall effect and quantum field theory. In the final part of the talk I will discuss how new developments in three-dimensional massive gravity could affect the description of massive modes in the Fractional Quantum Hall effect.
Non-Relativistic Gravity Dublin Institute for Advanced Studies DIAS 2024-02-08 | Speaker: Jelle Hartong (Edinburgh University)Abstract: I will discuss the 1/c expansion of general relativity where c is the speed of light. At low orders this gives Newton-Cartan gravity and generalisations thereof. At higher orders (and weak fields) this can be matched with the post-Newtonian expansion used in gravitational wave physics. The 1/c expansion can also be used to systematically study quantum mechanical systems in fixed gravitational backgrounds. Finally, by adding a negative cosmological constant I will show that non-relativistic gravity can mimic the fluid/gravity correspondence for Galilean fluids on the boundary of a non-relativistic version of AdS spacetime.
Entanglement Resolution and Boundary Conformal Field Theory Dublin Institute for Advanced Studies DIAS 2024-02-08 | Speaker: Christian Northe (Ben-Gurion University)Abstract: Conformal field theory is playing an essential role in developing our understanding of entanglement in many-body systems and field theory. I will discuss how it allows one to access the entanglement spectrum, which is known to encode defining characteristics of the system, such as topological signatures. In order to study these spectra in-depth in the presence of symmetries, a refined notion, called symmetry-resolved entanglement, can be introduced. I will demonstrate the lessons this holds when the system’s symmetry is generated by a U(1) Kac-Moody algebra and the Virasoro algebra.
Maxwell Theory of Fractons Dublin Institute for Advanced Studies DIAS 2024-02-08 | Speaker: Erica Bertolini (DIAS)Abstract: In this talk I will show that the main properties of the fracton quasiparticles can be derived from a generalized covariant Maxwell-like action. Starting from a rank-2 symmetric tensor field, a partially symmetric rank-3 tensor field strength can be built, which obeys a kind of Bianchi identity. The most general action invariant under the covariant fracton? transformation consists of two independent terms: one describing Linearized Gravity (LG) and the other referable to fractons, a proof of the always suspected relation between fractons and gravitons. I will also discuss that, as claimed in the Literature, the fracton part can be reconduced to a generalized Maxwell theory. In particular, in the covariant generalization of the fracton theory, the equations describing the fracton limited mobility, i.e. the charge and dipole conservation, are not external constraints, but rather consequences of the field equations of motion, hence of the invariant action and, ultimately, of the fracton covariant symmetry. I will also discuss boundary effects related to this fracton model.
