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The masses of weakly-coupled scalar fields in the early universe.

Lyth, David H. and Moroi, Takeo (2004) The masses of weakly-coupled scalar fields in the early universe. Journal of High Energy Physics, 2004 (5). 004.

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Abstract

We consider the effective mass-squared in the early Universe, of a scalar field which has only Planck-suppressed couplings with light fields and whose true mass is less than the Hubble parameter H. A detailed investigation shows that the effective mass-squared generically is of order ±H2 during inflation and matter-domination, but much smaller during radiation domination. We consider the special circumstances under which the mass-squared may be much bigger or much smaller than the generic value.

Item Type: Article
Journal or Publication Title: Journal of High Energy Physics
Uncontrolled Keywords: Cosmology of Theories beyond the SM ; Physics of the Early Universe
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 23929
Deposited By: ep_ss_importer
Deposited On: 24 Feb 2009 10:28
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 16:18
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/23929

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