During the semester we have a high energy seminar and a lunch seminar. In addition to these two seminars we participate in a joint theoretical high energy theory seminar in Newe Shalom. The joint seminar takes place on Tuesdays from 10:30 until 13:30 and includes two talks and lunch. This seminar is attended by the high energy groups of all the Israeli institutions and usually attracts a crowd of roughly twenty participants.
Sun Mon Tue Wed Thu Fri Sat
Title: Boundary conditions for a free scalar field
Abstract:
In the first part of the talk, I will consider the problem of classifying the conformal boundary conditions (b.c.) for the free scalar CFT. We will see how to tackle this problem using conformal bootstrap techniques. In the case of 4d bulk, I will show ournumerical results, which feature a “kink” that indicates the existence of a non-trivial “interacting” b.c., besides the obvious Neumann and Dirichlet “free” b.c.’s.
In the second part of the talk, I will discuss the RG flow of a 4d free scalar field coupled to large N vector models on the boundary. The (classically marginal) coupling involves the boundary mode of the scalar and the O(N) single-trace scalar operator. Iwill explain that the resulting RG connects two fixed points with bulk and boundary decoupled, and the local 3d sector is the free vector model in one end, and the critical one in the other end. This same RG admits two weak-strong dual descriptions, one fromthe free end, and one from the critical end.
Abstract: We illustrate the appearance of quantum extremal islands in holographic setups in higher dimensions. We emphasize the close parallel with the behaviour of holographic entanglement entropy in more familiar settings.
A
Title : Multi-point Bootstrap (and the search for a single open/closed string description of N=4 SYM)
A
Title: The Unreasonable Effectiveness of Higher-Derivative Supergravity in AdS_4 Holography
Abstract: I will describe the four-derivative corrections to four-dimensional N=2 minimal gauged supergravity and show that they are controlled by two constants. Interestingly, the solutions of the equations of motion in the two-derivative theory are not modified by the higher-derivative corrections. I will use this to arrive at a general formula for the regularized on-shell action for any asymptotically locally AdS_4 solution of the theory and show how the higher-derivative corrections affect black hole thermodynamic quantities in a universal way. I will employ these results in the context of holography to derive new explicit results for the subleading corrections in the large N expansion of supersymmetric partition functions on various compact manifolds for a large class of three-dimensional SCFTs arising from M2- and M5-branes. I will also briefly discuss possible extensions and generalizations of these results.
ayarom@technion.ac.il is inviting you to a scheduled Zoom meeting.
Topic: Bar’s journal club
Time: Nov 15, 2020 02:30 PM Jerusalem
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https://technion.zoom.us/j/99099738727
Meeting ID: 990 9973 8727
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Title: Fine probes of quantum chaos
Abstract: Quantum chaotic dynamics is associated to diverse physical phenomena and signatures. In this talk, we describe progress in building effective theories for three of these: the butterfly effect, the pole skipping phenomenon, and thermalization through the lens of entanglement entropy. We uncover their interplay by showing that the butterfly velocity plays an important role in all three manifestations of chaos. The discussion is informed by results from AdS/CFT and from models of SYK type.
ayarom@technion.ac.il is inviting you to a scheduled Zoom meeting.
Topic: Anton’s talk
Time: Nov 22, 2020 02:30 PM Jerusalem
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https://technion.zoom.us/j/96411533871
Meeting ID: 964 1153 3871
One tap mobile
+972553301762,,96411533871# Israel
+97239786688,,96411533871# Israel
Dial by your location
+972 55 330 1762 Israel
+972 3 978 6688 Israel
Meeting ID: 964 1153 3871
Find your local number: https://technion.zoom.us/u/aggbKmz7h