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2010

Non-adiabatic perturbations in decaying vacuum cosmology

Zimdahl, W., Borges, H. A., Carneiro, S. et al.

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We investigate a spatially flat Friedmann-Lema\^itre-Robertson-Walker cosmology in which a decaying vacuum term causes matter production at late times.

Assuming a decay proportional to the Hubble rate, the ratio of the background energy densities of dark matter and dark energy changes with the cosmic scale factor as $a^{-3/2}$.
The intrinsically non-adiabatic two-component perturbation dynamics of this model is reduced to a single second-order equation.
Perturbations of the vacuum term are shown to be negligible on scales that are relevant for structure formation.

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