On time-dependent backgrounds in 1 + 1 dimensional string theory

Balthazar, Bruno; Chu, Jinwei; Kutasov, David

doi:10.1007/jhep03(2024)025

Title: On time-dependent backgrounds in 1 + 1 dimensional string theory

Journal Article · 04 March 2024 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/jhep03(2024)025 · OSTI ID:2481514

Balthazar, Bruno ^[1]; Chu, Jinwei ^[2]; Kutasov, David ^[2]

University of Chicago, IL (United States); New York University (NYU), NY (United States)
University of Chicago, IL (United States)

In perturbative string theory, one is generally interested in asymptotic observables, such as the S-matrix in flat spacetime, and boundary correlation functions in anti-de Sitter spacetime. However, there are backgrounds in which such observables do not exist. We study examples of such backgrounds in 1 + 1 dimensional string theory. In these examples, the Liouville wall accelerates and can become spacelike in the past and/or future. When that happens, the corresponding null infinity, at which the standard scattering states are defined, is shielded by the Liouville wall. We compute scattering and particle production amplitudes in these backgrounds in the region in parameter space where the wall remains timelike, and discuss the continuation of this picture to the spacelike regime. We also discuss the physics from the point of view of the dynamics of free fermions in backgrounds with a time-dependent Fermi surface.

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Research Organization:: University of Chicago, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0009924

OSTI ID:: 2481514

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 3 Vol. 2024; ISSN 1029-8479

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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