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Speakers: João Penedones (EPFL, Lausanne), David Mateos (Univ. of Barcelona), Shira Chapman (Univ. of Amsterdam) and Costis Papageorgakis (Queen Mary, London). Location: Arenberg Castle, Leuven (Belgium).

Event details of Holography: triangle meeting
Date 25 January 2019
Time 10:30 -18:00


10:30 - 11:15  Arrival+Coffee/Tea

11:15 - 12:15  João Penedones (EPFL, Lausanne) 

Bootstrapping QCD: the lake, the peninsula and the kink

12:15 - 13:30 Lunch

13:30 - 14:30  David Mateos (Univ. of Barcelona) 

Extreme Holography

14:30 - 15:00  Coffee/Tea

15:00 - 16:00 Shira Chapman (Univ. of Amsterdam)

Holographic Complexity in Vaidya Spacetimes

16:00 - 17:00  Costis Papageorgakis (Queen Mary, London)

Exact Dimensional Deconstruction

17:00  Drinks


João Penedones

Bootstrapping QCD: the lake, the peninsula and the kink 

I will setup the S-matrix bootstrap of four dimensional scattering amplitudes with O(3) symmetry and no bound-states, and apply it to pion physics. A signature of pions is that they are derivatively coupled leading to (chiral) zeros in their scattering amplitudes.  Exploring the multi-dimensional space of chiral zeros positions, scattering length values and resonance mass values, we encounter lakes, peninsulas and kinks depending on which sections of this intricate multi-dimensional space we consider. I will discuss the remarkable location where QCD seems to lie in these plots, based on various experimental and theoretical expectations.

David Mateos

Extreme Holography

A massive experimental effort will be devoted in the coming years to the properties of QCD at high energy density and/or high baryon density. Understanding this physics, especially out of equilibrium, is an important theoretical challenge.

I will discuss how holography can help us address this challenge. Topics covered will include the far-from-equilibrium dynamics near the QCD critical point and colour superconducting phases. 

Shira Chapman 

Holographic Complexity in Vaidya Space times

We investigate holographic complexity for eternal black hole backgrounds perturbed by shock waves, with both the complexity = action (CA) and complexity = volume (CV) proposals.

We consider Vaidya geometries describing a thin shell of null fluid with arbitrary energy falling in from one of the boundaries of a two-sided AdS-Schwarzschild spacetime. We demonstrate how scrambling and chaos are imprinted in the complexity of formation and in the full time evolution of complexity via the switchback effect for light shocks, as well as analogous properties for heavy ones.

Costis Papageorgakis

Exact Dimensional Deconstruction

The deconstruction proposal provides a way to relate theories across dimensions. By starting with periodic-quiver gauge theories and taking an appropriate limit, one can reach higher-dimensional theories by reconstructing their KK spectrum, essentially turning compact directions in "theory space" to geometric ones. 

After reviewing the relevant details, I will describe how this idea can be implemented at the level of exact, supersymmetric partition functions. This will be followed by various applications in relation to the 6D (2,0) theory, Little String Theory and 4D N=2 theories in the presence of defects.


Arenberg Castle, Kardinaal Mercierlaan 94, 3001 Leuven (Belgium)

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Nikolay Bobev (Leuven)
Diego Hofman (Amsterdam)
Umut Gursoy (Utrecht)
Koenraad Schalm (Leiden)
Kyriakos Papadodimas (Groningen)


This event is part of a regular series of meetings sponsored by Delta ITP with the objective of bringing together the theoretical physics communities in Amsterdam, Leiden, Utrecht and our sister nodes Groningen, Brussels (ULB and VUB) and Leuven. The topic of this meeting is holography and its applications to different physical systems. We encourage researchers from different areas in theoretical physics to participate!