Long-Wavelength Modes of Cosmological Scalar Fields
Abstract
We give a numerical analysis of long-wavelength modes in the WKB approximation of cosmological scalar fields coupled to gravity via
ξ
ϕ
2
R
. Massless fields are coupled conformally at
ξ=1/6
. Conformality can be preserved for fields of nonzero mass by shifting
ξ
. We discuss implications for density perturbations.