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

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 $\pm H^2$ 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.

21 pages, published version

References in corpus (3)

• Towards Inflation in String Theory
• Closer towards inflation in string theory
• On Brane Inflation With Volume Stabilization

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