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Non-adiabatic perturbations in decaying vacuum cosmology

W. Zimdahl
(
- Espirito Santo U.
)
,
H.A. Borges
(
- Bahia U.
)
,
S. Carneiro
(
- Bahia U.
)
,
J.C. Fabris
(
- Espirito Santo U.
)
,
W.S. Hipolito-Ricaldi
(
- Espirito Santo U.
)

Apr, 2011

13 pages

Published in:

JCAP 04 (2011) 028

e-Print:

1009.0672 [astro-ph.CO]

DOI:

10.1088/1475-7516/2011/04/028

View in:

ADS Abstract Service

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Abstract: (arXiv)

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. On larger scales, dark-energy perturbations give a somewhat higher contribution but remain always smaller than the dark-matter perturbations.

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