The masses of weakly-coupled scalar fields in the early Universe

Details The masses of weakly-coupled scalar fields in the early Universe The masses of weakly-coupled scalar fields in the early Universe

2004-02-17

arxiv.org/abs/hep-ph/0402174v2

JHEP 0405 (2004) 004

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages, published version

Scientific paper

10.1088/1126-6708/2004/05/004

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 $\pm H^2$ 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.

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