| Thursday 25 April 2024 | |
| Events for day: Wednesday 08 December 2021 |
| 11:00 - 12:00 Wednesday Weekly Seminar - google meet Holographic entanglement entropy and modular Hamiltonian in warped CFT in the framework of GMMG model School PARTICLES AND ACCELERATORS Abstract: We study some aspects of a class of non-AdS holography where the 3d bulk gravity is given by Generalized Minimal Massive Gravity (GMMG). We consider the spacelike warped $AdS_3$ ($WAdS_3$) black hole solution of this model where the 2d dual boundary theory is the warped conformal field theory (WFCT). The charge algebra of the isometries in the bulk and the charge algebra of the vacuum symmetries at the boundary are compatible and this is an evidence for the duality conjecture. Further evidence for this duality is the equality of entanglement entropy and modular Hamiltonian on both sides of the duality. So we consider the modu ... 13:30 - 15:00 Weekly Seminar (Online) Rainbow black hole in quantum gravity https://www.skyroom.online/ch/soa/weekly-seminar School ASTRONOMY In this talk, I will present the theory of test quantum fields propagating on quantum spacetime of a collapsing homogeneous dust ball. It will be shown that, (i) due to quantum gravity effects, field modes experience a (semiclassical) dressed geometry on which classical singularity is resolved and is replaced by a bounce; (ii) in the presence of the backreaction of the field modes on the background quantum geometry, the emergent (interior) spacetime becomes mode-dependent; (iii) by matching the interior region with a convenient exterior geometry at the boundary surface, a mode-dependent (so-called rainbow) black hole spacetime emerges in the ... 14:00 - 15:00 Combinatorics and Computing Weekly Seminar Two Generalizations of Cayley Graphs and Related Problems School MATHEMATICS Link: https://join.skype.com/Ap6f2b74n00x ... 14:00 - 15:00 Weekly Seminar Condensed Matter and Statistical Physics Group A critical look at theoretical predictions and experimental discoveries of topological states of matter School PHYSICS Abstract: Topology is a branch of mathematics addressing the global properties of objects being independent of local smooth deformation, which has led to the concepts of topological invariants. The use of quantum topological concepts, however, have become common in condensed matter physics over the last 40 years. The first topological state discovered experimentally is the integer quantum Hall pointing to the topological character of the wave functions of a 2D electron gas. The topological materials have been, however, discovered in 2000-2021, mostly following theoretical predictions. While this might be tantalizing at first l ... 17:00 - 19:00 Mathematical Logic Weekly Seminar Higher Order Stability, 3-uniform Hyper Graphs, and Arithmetic Regularity School MATHEMATICS A hereditary graph property is a class of finite graphs closed under isomorphism and induced subgraphs. The stable regularity lemma of Malliaris and Shelah, along with folklore results about half-graphs, imply the following: a hereditary graph property P is stable if and only if for all $epsilon>0$, every sufficiently large element in P has an $epsilon$-regular partition with no irregular pairs. It is well known there are several distinct generalizations of Szemeredi's regularity lemma to the setting of hypergraphs. Consequently, there are several potential ways to generalize the correspondence between stability and the absence of irregula ... |