Speaker:   Zohar Komargodski
Title:   Entropic order
Abstract:   Ordered phases of matter, such as solids, ferromagnets, superfluids, or quantum topological order, typically only exist at low temperatures. Relatedly, large Black Holes have no hair. We present explicit
local models in which order exists at arbitrarily high temperature. The physical mech-
anism is that order in one degree of freedom can enable
many more to freely fluctuate, leading to “entropic order”, whereby typical high energy states are
ordered! Interacting bosons can lead to entropic order at any temperature, avoiding existing
no-go theorems on long-range order or entanglement at high temperature. We also show how we can obtain superconductors at very high temperature using these ideas.

Speaker:   Giuseppe Policastro
Title:   Energy transport in 2D holographic conformal and non-conformal interfaces
Abstract:   Defects and interfaces are the subjects of intense study in different contexts, as they provide useful probes quantum field theory and condensed-matter systems. In the case of two-dimensional conformal interfaces, universal properties are encoded in the flux of energy transmitted and reflected for an excitation scattering with the interface. I will discuss the study of energy trasport across interfaces in the holographic setup, using the minimal holographic model of a brane in AdS3, and extended brane configurations that can mimic top-down smooth gravity solutions, and the extension to a class of non-conformal defects obtained by turning on a TTbar-deformation of the CFT.

Observance
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Observance
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Title:   Computing with Thurston maps
Speaker:   Laurent Bartholdi [Saarland University]

Abstract:   Thurston maps are branched coverings of the 2-sphere all of whose critical points have finite orbits. They admit an algebraic avatar, a set with two commuting actions of a free group. I will present some computer code that translates between these two worlds, and show its usefulness in studying twists, matings, obstructions etc.
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Title:   Near-Degenerate Regime in Transcendental Dynamics
Speaker:   Kostiantyn Drach [Universitat de Barcelona]

Abstract:   Near-Degenerate Regime, i.e., a collection of tools and ideas to control degeneration of Riemann surfaces endowed with dynamics, has been instrumental in the most recent progress towards the MLC Conjecture and understanding rigidity of quadratic polynomials. Likewise, it was one of the key ingredients of extending Yoccoz's results from quadratic polynomials to polynomials of higher degree. In this talk, based on joint work in progress with Dima Dudko, we introduce this set of ideas into Transcendental Dynamics (to Yoccoz-type maps in the Speiser class) and discuss possible applications to rigidity as well as to Thurston-type realization problems.
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Public holiday