Dr
Marcus Sperling
(Yau Mathematical Sciences Center, Tsinghua University)
25/09/2019, 16:30
Cosmology & Astroparticle Physics
The physics of M5 branes placed near an M9 plane on an A-type ALE singularity exhibits a variety of phenomena that introduce additional massless degrees of freedom. There are tensionless strings whenever two M5 branes coincide or whenever an M5 brane approaches the M9 plane. These systems do not admit a low-energy Lagrangian description so new techniques are desirable to shed light on the...
Dr
Antonio Pittelli
(Uppsala University)
25/09/2019, 16:50
Cosmology & Astroparticle Physics
We consider 4d N=1 gauge theories with R-symmetry on a hemisphere times a torus. We apply localization techniques to evaluate the exact partition function through a cohomological reformulation of the supersymmetry transformations. Our results represent the natural elliptic lifts of the lower dimensional analogs as well as a field theoretic derivation of the conjectured 4d holomorphic blocks,...
Mr
Romain Ruzziconi
(ULB and International Solvay Institutes)
25/09/2019, 17:10
Cosmology & Astroparticle Physics
In this talk, I will discuss the solution space of general relativity in Bondi gauge, with non-vanishing cosmological constant. Using the dictionary between Bondi and Fefferman-Graham gauges, the analogues of the Bondi news, Bondi mass and Bondi angular momentum aspects at the boundary of generic asymptotically locally dS4 spacetimes will be identified. Then, I will introduce the Λ-BMS4 group...
Mr
Andrea Legramandi
(University of Milano-Bicocca)
25/09/2019, 17:35
Cosmology & Astroparticle Physics
Spinor bilinears have played an important role in classification of supergravity vacuum solutions. In this talk I will present a novel reformulation of supersymmetry conditions for type II theories in terms of spinor bilinears without assuming any factorization of space-time. These bispinors can be used to define brane calibrations, namely differential forms whose integrals measure minimal...
Marius Gerbershagen
(Universität Würzburg)
25/09/2019, 17:55
Cosmology & Astroparticle Physics
Due to the non-factorization of the Hilbert space into tensor products, the definition of entanglement entropy in gauge theories is subtle. It can be defined either by resorting to an algebraic approach or by embedding the state into an enlarged factorizing Hilbert space. The equivalence of these two approaches will be shown for entanglement between spatial degrees of freedom in 2d CFTs with...
Mr
Christian Northe
(Universität Würzburg)
25/09/2019, 18:20
Cosmology & Astroparticle Physics
We construct Kondo-like flows in the D1/D5 system. Within CFT, the
Kondo effect is described via branes which acquire additional dimensions. Starting from the D1/D5 system, we have found the BPS solutions to the DBI system describing Kondo-like RG flows between D1- and D3-brane solutions. Using a class of half BPS solutions we find corresponding backreacted supergravity interface solutions...
Mr
Hugo Camargo
(Max Planck Institute for Gravitational Physics)
25/09/2019, 18:40
String & Mathematical Physics
We apply the recently developed notion of complexity for field theory to a quantum quench through a critical point in 1+1 dimensions. We begin with a toy model consisting of a quantum harmonic oscillator, and show that complexity exhibits universal scalings in both the slow and fast quench regimes. We then generalize our results to a one-dimensional harmonic chain, and show that preservation...
