Kumiko Kotera - Les messagers de l’Univers violent @IhesFr

Uploaded December 2025 | Updated September 2026, 2 weeks ago

Véritables paparazzis du cosmos, les astronomes capturent aujourd’hui d’éphémères supernovae, pulsars, coalescences de trous noirs, sursauts gamma, etc. Sources d’une extraordinaire quantité d’énergie, ils libèrent de la lumière, mais aussi des rayons cosmiques, des neutrinos ou encore ces ondes gravitationnelles que nous détectons depuis peu.
Dans cette conférence, nous partirons à l’exploration de ce nouveau champ de recherche : l’Univers violent, et à la chasse à ses multi-messagers. Je conterai ce faisant l’aventure collective du projet GRAND, qui cherche à détecter ces particules grâce à des dizaines de milliers antennes déployées dans le désert de Gobi et la pampa argentine.

Kumiko Kotera (CNRS-Institut d’Astrophysique de Paris)

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Find this and many more scientific videos on carmin.tv - a French video platform for mathematics and their interactions with other sciences offering extra functionalities tailored to meet the needs of the research community.

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Kumiko Kotera - Les messagers de l’Univers violent

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$Pierre Schapira - Sheaves for spacetimes A causal manifold $(M,lambda)$ is a real manifold $M$ endowed with a closed convex proper cone $lambda$ in its cotangent bundle $T^*M$. On such a manifold, one defines the $lambda$-topology and the past or the future of any subset. A time function is a smooth surjective causal map $q: Mtomathbb R$ proper on the past or future of any compact subset of $M$. Using a time function, we show that if the micro-support of a sheaf $F$ does not intersect $lambdacup-lambda$ outside of the zero-section, then for any Cauchy hypersurface $N_t=q^{-1}(t)$, the restriction morphism $mathrm{R}Gamma(M;F)tomathrm{R}Gamma(N_t;Fvert_{N_t})$ is an isomorphism. As an application, we get that the Cauchy problem is globally well-posed for hyperfunction solutions of hyperbolic systems. Pierre Schapira (Institut de mathématiques Jussieu-Paris Rive Gauche) Find this and many more scientific videos on https://www.carmin.tv/ - a French video platform for mathematics and their interactions with other sciences offering extra functionalities tailored to meet the needs of the research community.$