Phys. Rev. D 70, 044017 (2004) [11 pages]

Particle production in matrix cosmology

Abstract

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Sumit R. Das^1,*, Joshua L. Davis^2,†, Finn Larsen^2,‡, and Partha Mukhopadhyay^1,§
¹Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA
²Michigan Center for Theoretical Physics, University of Michigan, Ann Arbor, Michigan 48109, USA

Received 27 April 2004; published 17 August 2004

We consider cosmological particle production in 1+1 dimensional string theory. The process is described most efficiently in terms of anomalies, but we also discuss the explicit mode expansions. In matrix cosmology the usual vacuum ambiguity of quantum fields in time-dependent backgrounds is resolved by the underlying matrix model. This leads to a finite energy density for the “in” state which cancels the effect of anomalous particle production.

URL:

http://link.aps.org/doi/10.1103/PhysRevD.70.044017

DOI:

10.1103/PhysRevD.70.044017

PACS:

04.62.+v, 04.60.Kz, 11.15.Pg

^*Email address: das@pa.uky.edu

^†Email address: joshuald@umich.edu

^‡Email address: larsenf@umich.edu

^§Email address: partha@pa.uky.edu

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Phys. Rev. D 70, 044017 (2004) [11 pages]

Particle production in matrix cosmology