Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - The masses of weakly-coupled scalar fields in the early universe.
AU - Lyth, David H.
AU - Moroi, Takeo
PY - 2004/5
Y1 - 2004/5
N2 - 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.
AB - 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.
KW - Cosmology of Theories beyond the SM
KW - Physics of the Early Universe
U2 - 10.1088/1126-6708/2004/05/004
DO - 10.1088/1126-6708/2004/05/004
M3 - Journal article
VL - 2004
SP - 004
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
IS - 5
ER -