Archive of IAS Physics Group Meetings

Abstract: I will present a class of exactly solvable lattice models of bosonic modes on the square lattice that realize chiral topological phases described by U(1)_{2n}​ Chern-Simons theory. The key ingredient is a factorization of the bosonic...

Abstract: Using the modified Villain lattice Hamiltonian formulation of the 1+1d compact boson theory, we construct exactly solvable abelian chiral lattice gauge theories in two spacetime dimensions. As a concrete example, we derive an explicit...

Abstract: In arxiv.org/abs/2306.16687 we developed a general construction of bulk 1+1d geometry from the two-point function of a generalized free field at the 0+1d boundary. This construction was numerical and requires discretization of time. In...

Abstract: I will briefly review the obstacles to constructing Anti–de Sitter vacua in string theory with very small extra dimensions compared to the AdS length, and the main ideas proposed to overcome them. I will then focus on a particular class of...

Abstract: I will introduce an effective field theory which describes scattering in the Regge limit in a systematic triple expansion in terms of t/s, Gt, and G^2st. Using the usual properties of the S-matrix, along with the emergent symmetries of the...

Abstract: I will argue on the possibility that compact extra dimensions obtain large size by higher dimensional inflation, relating the weakness of the actual gravitational force to the size of the observable universe. Although this can be realised...

Abstract: Global symmetry and anomaly have long served as powerful organizing principles for understanding quantum phases of matter in ground states. In this talk I will discuss recent progress in extending these ideas to many-body mixed states. I...

Abstract: I will discuss a simple model of topological gravity defined by a 3d TQFT summed over all geometries. I will explain how this sum is formulated so that the holographically dual boundary ensemble admits a probabilistic interpretation. This...

Abstract: Not much is known about what happens at the end of black hole evaporation. Pushing the semi-classical evolution well beyond its regime of validity suggests that the final Cauchy slice breaks into a piece that remains behind the event...