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: 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.
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Topic: Paolo’s talk
Time: Dec 6, 2020 02:30 PM Jerusalem
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Meeting ID: 965 8852 4118
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In this talk, we will derive and solve an effective theory to describe 4D flat space black holes which are just above the BPS bound. This theory is an N=4 supersymmetric version of the 2D Jackiw-Teitelboim gravity <-> 1D Schwarzian correspondence which we will obtain from nearly AdS2xS2 black holes in 4D N=2 supergravity. Using the Schwarzian description of these low temperature black holes, we can compute the partition function and density of states exactly. Our results verify several conjectures about near-BPS black holes coming from string theory, including an exact extremal degeneracy agreeing with Bekenstein-Hawking and a thermodynamic mass gap between extremal and near-extremal black holes.
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Meeting ID: 955 0764 0967
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Title: Thermal order in large N conformal gauge theories
Abstract: Our experience with many physical systems tells us that usually when a symmetry is spontaneously broken at low temperatures, it is restored upon increasing the temperature sufficiently. The abundance of such systems raises the question of whether this is a universal feature of all quantum systems. In this talk, I will present examples of (3+1)-dimensional non-supersymmetric large N gauge theories which demonstrate violations of the above feature. I will argue that in the N tending to infinity limit, these theories have conformal manifolds which survive under all loop corrections to the beta functions of the couplings. I will show that under certain conditions, a subset of points on such a conformal manifold demonstrates the spontaneous breaking of a global symmetry at all nonzero temperatures. Furthermore, I will demonstrate that this symmetry breaking is accompanied by the Higgsing of a subset of gauge bosons leading the system to be in a persistent Brout-Englert-Higgs phase.
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Meeting ID: 939 8250 8036
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Title: Comments on holographic description of Narain theories.
Abstract: I will discuss to what extent holographic description of
Narain theories can mimic the conventional picture of large c
holography with weakly coupled gravity in the bulk. Namely is it
possible that the effective IR bulk theory consist of “$U(1)$
gravity” amended with some additional states. This picture leads to a
hypothesis that in the large central charge limit density of states of
any Narain theory would be bounded by below by that one of “$U(1)$
gravity.” This immediately implies maximal value of spectral gap of
primary fields is $Delta_1=c/(2pi e)$. In the rest of the talk I
will discuss self-consistency of this picture using quantum code and
chiral CFTs. First, I will show the proposed picture yields a new
bound on quantum stabilizer codes, which is compatible with previously
known bounds in the literature. Next, I will discuss variance of the
density of states, which for consistency, must be vanishingly small in
the large $c$ limit. I will consider ensembles of code and chiral
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ayarom@technion.ac.il is inviting you to a scheduled Zoom meeting.
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Meeting ID: 996 6058 6760
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