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Quantum Fields and Strings Group Seminar
String Sandwiches & Worldsheet Quantum Equivalence Principle
String Sandwiches & Worldsheet Quantum Equivalence Principle
Organizers
Speaker
M. M. Sheikh-Jabbari
Time
Thursday, April 10, 2025 2:55 PM - 4:30 PM
Venue
A3-4-301
Online
Zoom 462 110 5973
(BIMSA)
Abstract
Worldsheet theory of strings is a generic Weyl-invariant 2d gravity and is customarily quantized by requiring vanishing of Virasoro constraints on physical string states up to spurious states. This customary choice obscures WQEP, Equivalence Principle at the Quantized Worldsheet theory level. We discuss that QWEP for closed strings can be made explicit by requiring Sandwich Virasoro Constraints (SVC), requiring vanishing of Virasoro constraints sandwiched between any two physical states. We show solutions to SVC come in four classes which are specified with whether they keep or break worldsheet parity P and/or time reversal T. The class which makes P and T manifest is associated with the usual Minkoswki worldsheet observer discussed in the string theory textbooks. The three other classes constitute Hilbert spaces of generic non-inertial worldsheet observers in which P or T or both are not broken. We apply our formulation to an accelerated worldsheet with horizons, initiating the worldsheet formulation of a thermal string theory and strings probing horizon of black holes.