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Equivariant Localization in Factorization Homology and Vertex Algebras from Supersymmetric Gauge Theory
I will discuss recent developments in describing the chiral algebras associated to 4d N=2 theories introduced by Beem et al. in terms of Omega backgrounds, and give a description of...
Sep 12, 2019
A solvable model for magnetic skyrmions
Magnetic skyrmions are topological solitons which occur in a large class of ferromagnetic materials and which are currently attracting much attention, not least because of their potential use for low-energy...
Sep 13, 2019
A mathematical framework for operational fine tunings
In the framework of ontological models, the features of quantum theory that emerge as inherently nonclassical always involve properties that are fine tuned, i.e. properties that hold at the operational...
Sep 13, 2019
Cosmology and cosmography from peculiar velocities in the nearby Universe
Maps of the mass density field can be used to predict peculiar velocities point-by-point. The comparison of these predictions to peculiar velocity data can be used to determine the cosmological...
Sep 17, 2019
Markov Chain Monte Carlo
Markov Chain Monte Carlo
Sep 17, 2019
Black hole microstate cosmology
In this talk we study a special class of high-energy states in holographic CFTs defined via Euclidean evolution from conformal boundary states. We argue that these are dual to black...
Sep 17, 2019
Entanglement entropy, quasiparticle fluctuations, and 1D thermal entropy in topological phases
Entanglement entropy in topologically ordered matter phases has been computed extensively using various methods. In this talk, we study the entanglement entropy of 2D topological phases from the perspective of...
Sep 17, 2019
Two applications of homotopy theory to physics
Topology illuminates properties of geometric spaces which are independent of scale. Scale-independent features of physical systems play an important role, for example when deducing the large-scale behavior from a small-scale...
Sep 18, 2019
Observational signatures for extremal black holes
The event horizon and the Cauchy horizon of an extremal black hole admit conserved charges associated with scalar perturbations. We will see that these charges are externally measurable from null...
Sep 19, 2019
Gapped boundary theories for 3d Chern-Simons
I will discuss a theorem, joint work in progress with Constantin Teleman, in which we characterize which topological 3-dimensional Chern-Simons theories admit nonzero boundary theories. Accepting some physical heuristics, it...
Sep 19, 2019