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Stringy effects during inflation and reheating

Frey, Andrew R. and Mazumdar, Anupam and Myers, Robert C. (2006) Stringy effects during inflation and reheating. Physical Review D, 73 (2). Art. No. 026003. ISSN 2470-0010.

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We consider inflationary cosmology in the context of string compactifications with multiple throats. In scenarios where the warping differs significantly between throats, string and Kaluza-Klein physics can generate potentially observable corrections to the cosmology of inflation and reheating. First we demonstrate that a very low string scale in the ground state compactification is incompatible with a high Hubble scale during inflation, and we propose that the compactification geometry is altered during inflation. In this configuration, the lowest scale is just above the Hubble scale, which is compatible with the effective field theory but still leads to potentially observable cosmic microwave background corrections. Also in the appropriate region of parameter space, we find that reheating leads to a phase of long open strings in the standard model sector (before the usual radiation-dominated phase). We sketch the cosmology of the long string phase and we discuss possible observational consequences.

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Additional Information:©2006 The American Physical Society (Received 28 September 2005; published 23 January 2006) We would like to thank O. Aharony, R. Brandenberger, A. Buchel, C. Burgess, X.-G. Chen, J. Cline, S. Hofmann, S. Kachru, L. Kofman, J. Polchinski, M. Savage, and M. Schulz for useful comments and conversations. The work of A.R.F. was supported by a John A. McCone Fellowship in Theoretical Physics at the California Institute of Technology. A.R. F. received additional partial support from DOE Grant No. DE-FG03-92-ER40701. Research at the Perimeter Institute is supported in part by funds from NSERC of Canada and MEDT of Ontario. R.C.M. is further supported by an NSERC Discovery grant. A.R.F. and A.M. would also like to thank the Aspen Center for Physics for hospitality during the final stages of this work.
Subject Keywords:string theory; cosmology; Kaluza-Klein theory; standard model; radiofrequency cosmic radiation
Issue or Number:2
Record Number:CaltechAUTHORS:FREprd06
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4094
Deposited By: Archive Administrator
Deposited On:26 Jul 2006
Last Modified:02 Oct 2019 23:09

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