Physics

Abstract: Complementing the spectacular breakthroughs in gravitational wave and multi-messenger observations of merging black holes and neutron stars, advancements in our theoretical understanding and modelling of strong gravity are essential to...

Abstract: In this work we attempt to understand the analytic structure of amplitudes in theories with broken Lorentz invariance. To this end, we use as an example a UV complete model for relativistic superfluids - a complex scalar theory with...

Abstract: For backgrounds with known exact worldsheet theory descriptions, ordinary string perturbation theory can be employed to study observables such as spectrum and scattering. However, the majority of interesting string backgrounds, including...

Abstract: Recently it was shown that black holes impart a fundamental rate of decoherence on all nearby quantum superpositions [Danielson, Satishchandran, Wald (DSW) 2022], eventually erasing all quantum information in their vicinity.  The effect...

Abstract: I will describe connections between ground states of quantum Hall Hamiltonians with multiple-Landau-level orbitals, whose excitations display either Abelian or non-Abelian braiding statistics, and  (non-holomorphic) symmetric polynomials...

Abstract: I will describe a double scaled matrix and tensor integral whose Feynman diagrams can be organized in a 3d topological expansion which agrees term by term with partition functions of 3d gravity. The integral is taken over CFT2 data, and...

Abstract: A basic tenet of quantum theory is that all elementary particles are either bosons or fermions. Ensembles of bosons or fermions behave differently due to differences in their underlying quantum statistics. Starting in the late 1970’s it...

Abstract: This will be an informal presentation / discussion of the basics of holographic theories that live on Cauchy slices (arXiv:2204.00591), which can be constructed by the TTbar deformation.  Please feel free to bring in questions and I will...

Abstract: How are infrared divergences related to the Shapiro time delay in GR? In this pedagogical lecture aimed at graduate students, we will study the physics of infrared divergences and their imprint on scattering amplitudes. We will mostly work...