Warm wave dark matter free streaming can shift by up to roughly 40% in a very early dark energy cosmology, while early matter domination moves the signal to unobservably small scales.
Moduli decay in the hot early Universe
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We consider moduli fields interacting with thermalized relativistic matter. We determine the temperature dependence of their damping rate and find it is dominated by thermal effects in the high temperature regime, i.e. for temperatures larger than their mass. For a simple scalar model the damping rate is expressed through the known matter bulk viscosity. The high temperature damping rate is always smaller than the Hubble rate, so that thermal effects are not sufficient for solving the cosmological moduli problem.
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Free streaming of warm wave dark matter in modified expansion histories
Warm wave dark matter free streaming can shift by up to roughly 40% in a very early dark energy cosmology, while early matter domination moves the signal to unobservably small scales.