Home > Research > Publications & Outputs > The masses of weakly-coupled scalar fields in t...
View graph of relations

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

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>05/2004
<mark>Journal</mark>Journal of High Energy Physics
Issue number5
Pages (from-to)004
Publication StatusPublished
<mark>Original language</mark>English


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.