Physics

Abstract: While von Neumann entropies for local subregions in quantum field theory universally contain ultraviolet divergences, there is widespread belief that differences between von Neumann entropies can be finite and well-defined in many...

Pulsar timing arrays {PTAs) and gravitational wave detectors can serve as valuable tools in the detection of dark matter. Dark matter substructure within the Milky Way Galaxy can induce gravitational pulls on pulsars, leading to observable...

Abstract: In this talk we will discuss how two objects of great interest to both mathematicians and physicists are connected.

On one hand, Amplituhedra are the image under a linear map of the positive part of the Grassmannian -- where all the...

Abstract: Recently, it has been argued that in certain settings, the entropy of a region in semiclassical quantum gravity can be computed in a UV-finite way using tools from the theory of operator algebras. I will attempt to formulate the most...

Abstract: Kinematically, massless particles in Lorentz-invariant theories are classified by a dimensionful "spin scale"ρ  (2nd Casimir invariant) that characterizes helicity states' mixing under little group transformations.  However, dynamics for...

Abstract: The existence of an event horizon is the defining property of a black hole. I shall review the properties of event horizons and discuss various examples demonstrating that event horizons are not smooth in dynamical processes such as black...

Abstract: Historically tensor networks have been helpful models of AdS/CFT, but there have always been some aspects that they fail to capture, particularly those involving the time direction. In this talk I will take the perspective that we can...

Abstract: We discuss shockwave geometries and the connections to aspects of flat space holography. We first show how the ’t Hooft commutation relations of shockwave operators are equivalent to the commutation relation between soft and Goldstone...

Abstract: Scattering amplitudes for the simplest theory of colored scalars— Tr $\phi^3$ theory — have been understood as arising from a counting problem associated with curves on a surface (arXiv:2309.15913v1). This formulation produces “stringy”...

Abstract: I discuss physical motivations from black hole physics and holography for expecting finite quantum entanglement entropy in quantum gravity. I describe recent and earlier results in defining such a notion in perturbative string theory by a...