SEMF | Vijay Balasubramanian | Complexity, Quantum Physics and Spacetime Structure @SEMF | Uploaded December 2022 | Updated October 2024, 15 hours ago.
Talk kindly contributed by Vijay Balasubramanian in SEMF's 2022 Spacious Spatiality
semf.org.es/spatiality
TALK ABSTRACT
Quantum mechanics and general relativity are the two pillars of 20th-century physics. However, paradoxes arise when we attempt to combine these theories to arrive at a quantum theory of space and time, often because the appearance of black holes and spacetime singularities seem to destroy quantum information. I will discuss how we can resolve these paradoxes by drawing on concepts of complexity and information from theoretical computer science, communications theory and cryptography. I will use techniques from these fields to explain diverse, interlinked aspects of fundamental physics, including: the possible emergence of space from non-spatial physical entities; the recovery of information from beyond the horizon of black holes; and, most fundamentally, causality in physical processes.
VIJAY BALASUBRAMANIAN
Department of Physics and Astronomy, University of Pennsylvania: https://live-sas-physics.pantheon.sas.upenn.edu/
University of Pennsylvania profile: https://live-sas-physics.pantheon.sas.upenn.edu/people/standing-faculty/vijay-balasubramanian
Personal website: https://www.sas.upenn.edu/~vbalasub/public-html/Home.html
Wikipedia: en.wikipedia.org/wiki/Vijay_Balasubramanian
Google Scholar: scholar.google.com/citations?user=ltj3BwwAAAAJ
ResearchGate: researchgate.net/scientific-contributions/Vijay-Balasubramanian-7739821
SEMF NETWORKS
Website: semf.org.es
Twitter: twitter.com/semf_nexus
LinkedIn: linkedin.com/company/semf-nexus
Instagram: instagram.com/semf.nexus
Facebook: facebook.com/semf.nexus
MUSIC
youtube.com/user/Baroquenoise
TIMESTAMPS
00:00:13 Introduction
00:01:17 Space, locality and causality
00:06:38 Warping space and time
00:10:08 Black holes
00:15:33 Black hole thermodynamics
00:25:53 What is quantum mechanics?
00:29:03 Hawking radiation
00:30:57 The black hole information paradox
00:39:39 How to construct the physical states of quantum gravity
00:44:51 Most black hole states are algorithmically complex
00:50:38 Meanings of “complexity”
00:55:53 Simple states can evolve into black holes
00:57:03 Quantum chaos and black hole formation
01:00:18 Chaos and complexity of time evolution
01:13:14 Chaos, complexity of time evolution, and black holes
01:15:33 Summary
01:18:47 Classical information
01:20:21 Quantum information
01:24:11 Information recovery from black holes
01:26:51 The no-cloning theorem
01:28:47 Causality is protected by complexity
01:31:14 A conjecture?
Talk kindly contributed by Vijay Balasubramanian in SEMF's 2022 Spacious Spatiality
semf.org.es/spatiality
TALK ABSTRACT
Quantum mechanics and general relativity are the two pillars of 20th-century physics. However, paradoxes arise when we attempt to combine these theories to arrive at a quantum theory of space and time, often because the appearance of black holes and spacetime singularities seem to destroy quantum information. I will discuss how we can resolve these paradoxes by drawing on concepts of complexity and information from theoretical computer science, communications theory and cryptography. I will use techniques from these fields to explain diverse, interlinked aspects of fundamental physics, including: the possible emergence of space from non-spatial physical entities; the recovery of information from beyond the horizon of black holes; and, most fundamentally, causality in physical processes.
VIJAY BALASUBRAMANIAN
Department of Physics and Astronomy, University of Pennsylvania: https://live-sas-physics.pantheon.sas.upenn.edu/
University of Pennsylvania profile: https://live-sas-physics.pantheon.sas.upenn.edu/people/standing-faculty/vijay-balasubramanian
Personal website: https://www.sas.upenn.edu/~vbalasub/public-html/Home.html
Wikipedia: en.wikipedia.org/wiki/Vijay_Balasubramanian
Google Scholar: scholar.google.com/citations?user=ltj3BwwAAAAJ
ResearchGate: researchgate.net/scientific-contributions/Vijay-Balasubramanian-7739821
SEMF NETWORKS
Website: semf.org.es
Twitter: twitter.com/semf_nexus
LinkedIn: linkedin.com/company/semf-nexus
Instagram: instagram.com/semf.nexus
Facebook: facebook.com/semf.nexus
MUSIC
youtube.com/user/Baroquenoise
TIMESTAMPS
00:00:13 Introduction
00:01:17 Space, locality and causality
00:06:38 Warping space and time
00:10:08 Black holes
00:15:33 Black hole thermodynamics
00:25:53 What is quantum mechanics?
00:29:03 Hawking radiation
00:30:57 The black hole information paradox
00:39:39 How to construct the physical states of quantum gravity
00:44:51 Most black hole states are algorithmically complex
00:50:38 Meanings of “complexity”
00:55:53 Simple states can evolve into black holes
00:57:03 Quantum chaos and black hole formation
01:00:18 Chaos and complexity of time evolution
01:13:14 Chaos, complexity of time evolution, and black holes
01:15:33 Summary
01:18:47 Classical information
01:20:21 Quantum information
01:24:11 Information recovery from black holes
01:26:51 The no-cloning theorem
01:28:47 Causality is protected by complexity
01:31:14 A conjecture?
