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
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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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
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Title: Gravity from Averaging CFTs
Abstract: I will explore the idea that certain theories of gravity in Anti-de
Sitter space are dual to an average over an ensemble of quantum
theories, rather than to a specific quantum theory. I will describe
an average over Narain’s family of two-dimensional conformal field
theories which describe free bosons on a torus, and compute the
partition function using the Siegel-Weil formula. The result takes
the form of a sum over geometries as one would expect in a theory of
gravity. But the gravitational theory looks more like a Chern-Simons
theory than like Einstein gravity.
ayarom@technion.ac.il is inviting you to a scheduled Zoom meeting.
Topic: Sebastian’s journal club talk
Time: Nov 29, 2020 02:30 PM Jerusalem
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https://technion.zoom.us/j/93922529082
Meeting ID: 939 2252 9082
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Meeting ID: 939 2252 9082
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Title: Global symmetry, Euclidean gravity, and the black hole information problem
Abstract: In this talk I will show how the essential ingredients of recent calculations of the Page curve of an evaporating black hole can be usedto generalize a recent argument against global symmetries beyond the AdS/CFT correspondence to more realistic theories of quantum gravity, illustrating a close connection between the absence of global symmetries and a unitary resolution of the black hole informationproblem. I’ll also give several low-dimensional examples of quantum gravity theories which do not have a unitary resolution of the black hole information problem, and which therefore can and do have global symmetries. Motivated by this discussion, I’ll conjecturethat in a certain sense Euclidean quantum gravity is equivalent to holography. Based on recent work with Edgar Shaghoulian.
ayarom@technion.ac.il is inviting you to a scheduled Zoom meeting.
Topic: Paolo’s talk
Time: Dec 6, 2020 02:30 PM Jerusalem
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https://technion.zoom.us/j/96588524118
Meeting ID: 965 8852 4118
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Meeting ID: 965 8852 4118
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