SPEAKERS

• Betouras, Joseph (Loughborough U.)

Title:Some recent developments in correlated electron systems: effects of interactions on topological Fermi surface transitions and non-Landau damping in ferromagnetic superconductors

Abstract: Topological transitions of the Fermi Surface (Lifshitz) is an old concept, that has started playing a fundamental role in the physics of many quantum systems. The effects of interactions remain unresolved. In this talk, after introducing the main concepts of Lifshitz and Pomeranchuk instabilities of the Fermi surface as well as a proposal for a cold atom experiment, I will focus on the recent physics of sodium cobaltates (NaxCoO2) exposed under the hypothesis of a Lifshitz transition. If time permits, I will also discuss the resolution of a long-standing puzzle on the absence of Landau damping in some ferromagnetic superconductors.

• Charmousis, Christos (Univ Paris Sud, CNRS)

Title: Hairy black holes in scalar tensor theories

Abstract: We will discuss spherically symmetric black holes of a certain class of Horndeski theories where the scalar field has translational invariance. We will show how one can construct hairy black holes where the scalar field has time and radial dependence and is regular on the black hole event horizon.

• Farakos, Fotis (Padua U.)

Title: Supergravity and constrained superfields

Abstract: When supersymmetry is broken one may remove from the spectrum of the theory various component fields. This is achieved by introducing appropriate constraints to the various superfields. We discuss the coupling of the nilpotent Goldstino superfield to supergravity, and other forms of matter couplings and constrained superfields. We also discuss applications to inflationary cosmology.

• Iatrakis, Ioannis (Utrecht U.)

Title: The anomalous transport of axial charge, induced by topological fluctuations

Abstract: Axial charge imbalance is an essential ingredient in novel effects related to the the chiral anomaly like the chiral magnetic effect. In non-Abelian plasma with chiral fermions, local axial charge can be generated either by topological fluctuations of the medium or by usual thermal fluctuations. We show how local topological domains in QCD medium lead to the dynamical generation of an axial flavor current. The current is explicitly calculated in the context of holography

and it's phenomenological importance in Heavy-Ion collisions is discussed. The transport of dynamically generated axial charge density is then presented, and the

corresponding chiral magnetic current is computed.

• Itsios, Georgios (Santiago de Compostela U.)

Title: Holographic quantum liquids

Abstract: In this talk we discuss aspects of quantum liquids using holographic techniques. Our holographic description is realized through a top-down approach, in which we consider D-brane intersections of different dimensionalities. We will analyze several properties of these systems such as the speed of first sound, the speed of zero sound and the diffusion constant.

• Linardopoulos, Georgios (Demokritos & Athens U.)

Title: The Omega-Infinity Limit of Single Spikes

Abstract: A new infinite-size limit of strings in RxS2 is presented. The limit is obtained from single spike strings by letting their angular velocity omega become infinite. We derive the energy-momenta relation of omega-infinity single spikes as their linear velocity v-->1 and their angular momentum J-->1. Generally, the v-->1, J-->1 limit of single spikes is singular and has to be excluded from the spectrum and be studied separately. We discover that the dispersion relation of omega-infinity single spikes contains logarithms in the limit J-->1. This result is somewhat surprising, since the logarithmic behavior in the string spectra is typically associated with their motion in non-compact spaces such as AdS.

• Panotopoulos, Grigoris (Chile U.)

Title: Non-standard quartic inflation after the Planck results

Abstract: After the recent Higgs boson discovery at CERN, it is natural to try to realize inflation with the Higgs and its self-interaction potential provided by the particle physics we know. However, the simplest scalar potential allowed in renormalizable theories, namely the quartic one, has been ruled out by data in standard cold inflation with a minimally coupled scalar field. Here we show that the quartic potential can give rise to viable inflation in non-standard scenarios, such as warm inflation or non-minimally coupled scalar field to gravity.

• Papadimitriou, Ioannis (SISSA)

Title:A goldstino at the bottom of the cascade

Abstract: Working within a five-dimensional consistent truncation of type IIB supergravity dimensionally reduced on T^(1,1), we consider supersymmetry breaking solutions with the asymptotics of the supersymmetric Klebanov-Strassler background. There exists a two-parameter family of such solutions. Within this family, we show that those (and only those) solutions related to antiD-branes at the tip of the conifold correspond to dual field theory vacua where a goldstino mode is present and supercurrent Ward identities hold. Our findings do not depend on the IR singularity of the dual backgrounds, nor on its resolution. As such, they constitute an independent, necessary check for the existence of supersymmetry breaking vacua in the conifold cascading gauge theory. Our analysis relies on a holographic derivation of the Ward identities which has a wider applicability, beyond the specific system and symmetries considered here.

• Papadodimas, Kyriakos (CERN)

Title: The black hole information paradox and the fate of the infalling observer

Abstract: General Relativity predicts that the horizon of a large black hole is smooth. On the other hand, Quantum mechanics, and the requirement that no information is lost during black hole evaporation, suggests that the horizon may be dramatically modified at the quantum level, even when the local curvature is small.

I will discuss recent developments related to this fundamental conflict between General Relativity and quantum mechanics. I will present a proposal, motivated by the AdS/CFT correspondence, which seems to resolve the paradox and which opens up a novel framework for a quantitatively precise description of the black hole interior.

• Pomoni, Elli (DESY)

Title: Spectral curves of N = 1 theories of class Sk

Abstract: We study the Coulomb branch of class Sk N = 1 SCFTs by constructing and analyzing their spectral curves.

• Proukakis, Nikolaos (Newcastle U.)

Title: Quantum Gases: An ideal playground for macroscopic quantum physics

Abstract: Bose-Einstein condensation is a ubiquitous phenomenon arising across all physical length and energy scales, ranging from atomic and condensed matter physics to astrophysics and giving rise to macroscopic "super"-properties. A detailed study of such a phase transition requires a weakly-interacting system (gas), and ground-breaking experiments over the past 20 years have enabled the pure study of condensation phenomena in novel systems (e.g. cold atoms, polaritons, photons, magnons) where ab initio theories can be formulated to describe the system. After a brief overview of the "ultracold atom revolution", which provided the first "smoking gun" signature of Bose-Einstein condensation (Nobel Prize 2001), I will discuss selected examples of the diverse physics encompassed by such systems, including dynamics of macroscopic excitations, condensate formation and the emergence of universal scaling laws in controlled phase transition quenches.

• Zafeiropoulos, Savvas (Frankfurt U.)

Title: Random Matrix Theory for Wilson Fermions

Abstract: We summarize recent results of Random Matrix Theory (RMT) for Wilson fermions. We focus on the Hermitian as well as the non-Hermitian Wilson Dirac operator and provide analytical and numerical results of their eigenvalue densities. The results span both QCD and QCD-like theories. We conclude by utilizing the analytical RMT formulae in order to extract Low Energy Constants of Quantum Chromodynamics from a dynamical simulation of Twisted Mass Wilson fermions on the lattice.