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: 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
Join Zoom Meeting
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
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
Join Zoom Meeting
https://technion.zoom.us/j/93922529082
Meeting ID: 939 2252 9082
One tap mobile
+97239786688,,93922529082# Israel
+972553301762,,93922529082# Israel
Dial by your location
+972 3 978 6688 Israel
+972 55 330 1762 Israel
Meeting ID: 939 2252 9082
Find your local number: https://technion.zoom.us/u/aZYLQpUdS
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
Join Zoom Meeting
https://technion.zoom.us/j/96588524118
Meeting ID: 965 8852 4118
One tap mobile
+97239786688,,96588524118# Israel
+972553301762,,96588524118# Israel
Dial by your location
+972 3 978 6688 Israel
+972 55 330 1762 Israel
Meeting ID: 965 8852 4118
Find your local number: https://technion.zoom.us/u/adtIpI2DKL
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.
ayarom@technion.ac.il is inviting you to a scheduled Zoom meeting.
Join Zoom Meeting
https://technion.zoom.us/j/95507640967
Meeting ID: 955 0764 0967
One tap mobile
+972553301762,,95507640967# Israel
+97239786688,,95507640967# Israel
Dial by your location
+972 55 330 1762 Israel
+972 3 978 6688 Israel
Meeting ID: 955 0764 0967
Find your local number: https://technion.zoom.us/u/ad23egj816