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Technion-Haifa University String Theory Group

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    • Seminars
    • Conferences
    • Visitors
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  • Home
  • Members
  • Publications
  • Activities
    • Seminars
    • Conferences
    • Visitors
  • Resources
  • Prospective students

Seminars

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.

  • Categories
    Neve Shalom
    Journal club
    Local seminar
Month
Agenda
Day
Month
Week
2019 Sep October 2020 Nov 2021
Sun Mon Tue Wed Thu Fri Sat
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4
5
6
Shota komatsu 4:00 pm
Shota komatsu
Oct 6 @ 4:00 pm – 5:00 pm
Tickets
Title: Landau diagrams in AdS and S-matrices from conformal correlators Abstract: Quantum field theories in AdS generate conformalcorrelation functions on the boundary, and in the limit where AdS is nearly flat one should be able …
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10
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12
13
Lorenzo di Pietro 11:30 am
Lorenzo di Pietro
Oct 13 @ 11:30 am – 12:30 pm
Tickets
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 …
14
15
16
17
18
19
20
Rob Myers 4:00 pm
Rob Myers
Oct 20 @ 4:00 pm – 5:00 pm
Tickets
Title: Quantum Extremal Islands Made EasyAbstract: 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 …
21
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26
High Energy Physics Seminar, Bin Wu, Title: Deciphering the Inner Workings of the Quark-Gluon Plasma 11:30 am
High Energy Physics Seminar, Bin Wu, Title: Deciphering the Inner Workings of the Quark-Gluon Plasma
Oct 26 @ 11:30 am – 12:30 pm
Tickets
A
27
Pedro Vieira 4:00 pm
Pedro Vieira
Oct 27 @ 4:00 pm – 5:00 pm
Tickets
Title : Multi-point Bootstrap (and the search for a single open/closed string description of N=4 SYM)
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2019 Sep October 2020 Nov 2021
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  • Categories
    Neve Shalom
    Journal club
    Local seminar
Agenda
Agenda
Day
Month
Week
October – November 2020 Oct – Nov 2020
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Oct
6
Tue
Shota komatsu
Tickets
Oct 6 @ 4:00 pm – 5:00 pm

Title: Landau diagrams in AdS and S-matrices from conformal correlators

Abstract: Quantum field theories in AdS generate conformalcorrelation functions on the boundary, and in the limit where AdS is nearly flat one should be able to extract an S-matrix from such correlators. We discuss a particularly simple position-space procedure to do so. It features a direct map from boundary positionsto (on-shell) momenta and thereby relates cross ratios to Mandelstam invariants. This recipe succeeds in several examples, includes the momentum-conserving delta functions, and can be shown to imply the two proposals based on Mellin space and on the OPE data.Interestingly the procedure does not always work: the Landau singularities of a Feynman diagram are shown to be part of larger regions, to be called `bad regions’, where the flat-space limit of the Witten diagram diverges. To capture these divergences we introducethe notion of Landau diagrams in AdS. As in flat space, these describe on-shell particles propagating over large distances in a complexified space, with a form of momentum conservation holding at each bulk vertex. As an application we recover the anomalousthreshold of the four-point triangle diagram at the boundary of a bad region.

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Categories: Neve Shalom
Oct
13
Tue
Lorenzo di Pietro
Tickets
Oct 13 @ 11:30 am – 12:30 pm

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.

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Categories: Neve Shalom
Oct
20
Tue
Rob Myers
Tickets
Oct 20 @ 4:00 pm – 5:00 pm
Title: Quantum Extremal Islands Made Easy

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.

Read more
Categories: Neve Shalom
Oct
26
Mon
High Energy Physics Seminar, Bin Wu, Title: Deciphering the Inner Workings of the Quark-Gluon Plasma
Tickets
Oct 26 @ 11:30 am – 12:30 pm

A

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Categories: Local seminar
Oct
27
Tue
Pedro Vieira
Tickets
Oct 27 @ 4:00 pm – 5:00 pm

Title : Multi-point Bootstrap (and the search for a single open/closed string description of N=4 SYM)

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Categories: Neve Shalom
Nov
3
Tue
Barak Kol
Tickets
Nov 3 @ 4:00 pm – 5:00 pm
Title: Flux-based statistical prediction of three-body outcomes

Abstract: The three-body problem in Newtonian gravity is one of the oldest and richest problems in physics. Giants worked on it and it served as the source of numerous fields in theoretical physics and mathematics including perturbation theory, topology and chaos. Yet, it remains unsolved, and up to this work, the associated statistical theory was incomplete and flawed. 

Here, I present a reduction of the differential decay rate in a factorized form. One factor is the flux of phase-space volume, rather than the volume itself which was used in all previous works, and it is given in a cutoff-independent closed-form. The other factor is related to the chaotic absorptivity and to Kirchhoff’s law of thermal radiation, also known as greybody radiation. Numerical evidence will be presented. I believe that this exact factorization cracks the problem and would allow future progress. Based on https://arxiv.org/abs/2002.11496

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Categories: Neve Shalom
Nov
9
Mon
High Energy Physics Seminar, Roy Brener, Title: Estimating the sensitivity to new light resonances decaying to boosted quark pairs and produced in association with a photon in the ATLAS experiment
Tickets
Nov 9 @ 11:30 am – 12:30 pm

A

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Categories: Local seminar
Nov
10
Tue
Nikolay Bobev
Tickets
Nov 10 @ 4:00 pm – 5:00 pm

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.

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Categories: Neve Shalom
Nov
15
Sun
Bar’s journal club
Tickets
Nov 15 @ 2:30 pm – 3:30 pm

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

Join Zoom Meeting
https://technion.zoom.us/j/99099738727

Meeting ID: 990 9973 8727
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Categories: Journal club
Nov
17
Tue
Mark Mezei
Tickets
Nov 17 @ 4:00 pm – 5:00 pm

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.

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Categories: Neve Shalom
October – November 2020 Oct – Nov 2020
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