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
ayarom@technion.ac.il is inviting you to a scheduled Zoom meeting.
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https://technion.zoom.us/j/93982508036
Meeting ID: 939 8250 8036
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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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https://technion.zoom.us/j/99660586760
Meeting ID: 996 6058 6760
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Meeting ID: 996 6058 6760
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ayarom@technion.ac.il is inviting you to a scheduled Zoom meeting.
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https://technion.zoom.us/j/93584505801
Meeting ID: 935 8450 5801
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Title: Frontiers in Positive Geometry.
Abstract: In this talk I will describe work in progress connecting scattering amplitudes to amplituhedra and positive geometries in kinematic space. For N=4 SYM in the planar limit, I will show how the geometry of the amplituhedron naturally provides a new approach to non-perturbative physics. I will also describe conjectural all-loop order, non-planar, non-supersymmetric amplituhedra for the tr(phi^3) theory–which are new (generally infinite) polytopes attached to any Riemann surface–and show how the connection to positive geometry forces the existence of “gravity” in this setting.
ayarom@technion.ac.il is inviting you to a scheduled Zoom meeting.
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https://technion.zoom.us/j/91205843934
Meeting ID: 912 0584 3934
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Meeting ID: 912 0584 3934
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Title: Using Soft Hair to Dissolve the Firewall
Abstract: We build on the observation by Hawking, Perry and Strominger that a global black hole space-time supports a large number of soft hair degrees of freedom to shed new light on the firewall argument by Almheiri, Marolf, Polchinski, and Sully. The soft hair carries a sizable amount of entropy and is encoded in a transition function that connects the asymptotic and near horizon regions. We argue that an infalling observer automatically measures the classical value of the soft mode before reachingthe horizon and that this measurement implements a code subspace projection that enables the reconstruction of interior operators. We use the soft hair dynamics to introduce an observer dependent notion of the firewall and show that an infalling observer neverencounters a firewall before reaching the singularity.
Title: Detecting chaos in hydrodynamics
Abstract: Hydrodynamics assumes local equilibration and equilibration assumes ergodic mixing driven by chaos — at least in semi-classical systems. For a generic such system the timescales of macroscopic thermalization and onset of microscopic chaos are very different. Nevertheless, it is a pillar of Boltzmann transport that long-time equilibration can be computed from microscopic dynamics. We show how in these systems the two timescales are in fact related. Moreover, we show that a similar connection between both scales surprisingly also exists in extremely strongly coupled systems through a phenomenon christened pole-skipping in hydrodynamic response.