Parameterizing the Effect of Dark Energy Perturbations on the Growth of Structures - INSPIRE

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Parameterizing the Effect of Dark Energy Perturbations on the Growth of Structures

Guillermo Ballesteros
(
- Madrid, IFT and
- CERN
)
,
Antonio Riotto
(
- CERN and
- INFN, Padua
)

Jul, 2008

6 pages

Published in:

Phys.Lett.B 668 (2008) 171-176

e-Print:

0807.3343 [astro-ph]

DOI:

10.1016/j.physletb.2008.08.035

Report number:

CERN-PH-TH-2008-160,
IFT-UAM-CSIC-08-46

View in:

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Abstract: (Elsevier)

We present an analytical fit to the growth function of the dark matter perturbations when dark energy perturbations are present. The growth index γ depends upon the dark energy equation of state w , the speed of sound of the dark energy fluctuations, the dark matter abundance and the observed comoving scale. The growth index changes by O(5%) for small speed of sound and large deviations of w from −1 with respect to its value in the limit of no dark energy perturbations.

References(55)

Figures(7)

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SNLS

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Edmund Bertschinger
(
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)

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(
- LBL, Berkeley
)
,
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(
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)

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(
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)

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Viviana Acquaviva
(
- Pennsylvania U. and
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)
,
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(
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)

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Bhuvnesh Jain
(
- Pennsylvania U.
)
,
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(
- Shanghai, Astron. Observ. and
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)

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•
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(
- Tsinghua U., Beijing
)
,
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(
)

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•
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- JCAP 12 (2036) 001

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(
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)

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(
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(
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)
,
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)

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