Speaker:	Shota Komatsu (CERN)
Title:	Title: 1. Chiral Composite Linear Dilaton / Title 2. No Shift, Sherlock
Date (JST):	Tue, Dec 16, 2025, 15:30 - 17:00
Place:	Seminar Room B
Abstract:	1. I will explain the Chiral Composite Linear Dilaton (CLD), a novel worldsheet theory recently introduced. It is a beta-gamma system deformed by a linear-dilaton like action made out of a composite of gamma's. It can be viewed as a noncritical generalization of nonrelativistic string theory previously studied by Gomis and Ooguri. I will explain how observables can be computed by a path integral despite high nonlinearity and highlight applications to string duals of chiral 2d Yang-Mills and symmetric product orbifolds and a worldsheet description of a class of generalized Veneziano amplitudes. 2. I present a non-perturbative argument for the absence of shift symmetry in quantum gravity in AdS. We first translate the statement in the bulk quantum gravity to a statement in conformal field theory using the AdS/CFT correspondence. The corresponding CFT statement is the absence of "trivial" conformal manifold, which I will define. I will then argue such trivial conformal manifolds cannot arise in CFTs with stress tensor by making use of the conformal interface. I will also discuss generalizations to higher-form symmetries and the connection to monodromy defects. Our argument extends the existing argument by Harlow and Ooguri (for a special case of the shift symmetry) to a regime where quantum gravity is not necessarily semiclassical. Based on work to appear with Jose Calderon-Infante, Lucia Cordova and Irene Valenzuela.

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