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

We present an analytical fit to the growth function of the dark matter perturbations when dark energy perturbations are present. The growth index 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...

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Detalles Bibliográficos
Autores principales: Ballesteros, Guillermo, Riotto, Antonio
Lenguaje:eng
Publicado: 2008
Materias:
Astrophysics and Astronomy
Acceso en línea:https://dx.doi.org/10.1016/j.physletb.2008.08.035
http://cds.cern.ch/record/1116651
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author Ballesteros, Guillermo
Riotto, Antonio
author_facet Ballesteros, Guillermo
Riotto, Antonio
author_sort Ballesteros, Guillermo
collection CERN
description We present an analytical fit to the growth function of the dark matter perturbations when dark energy perturbations are present. The growth index 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 ~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.
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institution Organización Europea para la Investigación Nuclear
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publishDate 2008
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spelling cern-11166512023-03-15T19:11:22Zdoi:10.1016/j.physletb.2008.08.035http://cds.cern.ch/record/1116651engBallesteros, GuillermoRiotto, AntonioParameterizing the Effect of Dark Energy Perturbations on the Growth of StructuresAstrophysics and AstronomyWe present an analytical fit to the growth function of the dark matter perturbations when dark energy perturbations are present. The growth index 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 ~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.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.We present an analytical fit to the growth function of the dark matter perturbations when dark energy perturbations are present. The growth index 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 ~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.arXiv:0807.3343CERN-PH-TH-2008-160IFT-UAM-CSIC-08-46CERN-PH-TH-2008-160IFT-UAM-CSIC-08-46oai:cds.cern.ch:11166512008-07-23
spellingShingle Astrophysics and Astronomy
Ballesteros, Guillermo
Riotto, Antonio
Parameterizing the Effect of Dark Energy Perturbations on the Growth of Structures
title Parameterizing the Effect of Dark Energy Perturbations on the Growth of Structures
title_full Parameterizing the Effect of Dark Energy Perturbations on the Growth of Structures
title_fullStr Parameterizing the Effect of Dark Energy Perturbations on the Growth of Structures
title_full_unstemmed Parameterizing the Effect of Dark Energy Perturbations on the Growth of Structures
title_short Parameterizing the Effect of Dark Energy Perturbations on the Growth of Structures
title_sort parameterizing the effect of dark energy perturbations on the growth of structures
topic Astrophysics and Astronomy
url https://dx.doi.org/10.1016/j.physletb.2008.08.035
http://cds.cern.ch/record/1116651
work_keys_str_mv AT ballesterosguillermo parameterizingtheeffectofdarkenergyperturbationsonthegrowthofstructures
AT riottoantonio parameterizingtheeffectofdarkenergyperturbationsonthegrowthofstructures

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