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Cited by 60Cosmology and Gravitation TheoriesGalaxies: Formation, Evolution, PhenomenaDark Matter and Cosmic Phenomena

Can a galaxy redshift survey measure dark energy clustering?

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Takada, Masahiro·2006·Physical Review D
DOI 10.1103/physrevd.74.043505
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Abstract

A wide-field galaxy redshift survey allows one to probe galaxy clustering at largest spatial scales, which carries invaluable information on horizon-scale physics complementarily to the cosmic microwave background (CMB). Assuming the planned survey consisting of $z\ensuremath{\sim}1$ and $z\ensuremath{\sim}3$ surveys with areas of 2000 and $300\text{ }\text{ }{\mathrm{deg}}^{2}$, respectively, we study the prospects for probing dark energy clustering from the measured galaxy power spectrum, assuming the dynamical properties of dark energy are specified in terms of the equation of state and the effective sound speed ${c}_{\mathrm{e}}$ in the context of an adiabatic cold dark dominated matter model. The dark energy clustering adds a power to the galaxy power spectrum amplitude at spatial scales greater than the sound horizon, and the enhancement is sensitive to redshift evolution of the net dark energy density, i.e. the equation of state. We find that the galaxy survey, when combined with CMB expected from the Planck satellite mission, can distinguish dark energy clustering from a smooth dark energy model such as the quintessence model (${c}_{\mathrm{e}}=1$), when ${c}_{\mathrm{e}}\ensuremath{\lesssim}0.04$ (0.02) in the case of the constant equation of state ${w}_{0}=\ensuremath{-}0.9$ ($\ensuremath{-}0.95$). An ultimate full-sky survey of $z\ensuremath{\sim}1$ galaxies allows the detection when ${c}_{\mathrm{e}}\ensuremath{\lesssim}0.08$ (0.04) for ${w}_{0}=0.9$ ($\ensuremath{-}0.95$). These forecasts show a compatible power with an all-sky CMB and galaxy cross correlation that probes the integrated Sachs-Wolfe effect. We also investigate a degeneracy between the dark energy clustering and the nonrelativistic neutrinos implied from the neutrino oscillation experiments, because the two effects both induce a scale-dependent modification in the galaxy power spectrum shape at largest spatial scales accessible from the galaxy survey. It is shown that a wider redshift coverage can efficiently separate the two effects by utilizing the different redshift dependences, where dark energy clustering is apparent only at low redshifts $z\ensuremath{\lesssim}1$.

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Authors
Takada, M.
Affiliations
Tohoku University (JP)
Corresponding author
Takada, Masahiro
ORCID
Takada, Masahiro
Venue
Physical Review D
Publisher
American Physical Society (APS)
Published
2006-08-04
Volume
74
Issue
4
ISSN
  • 0556-2821 (ISSN-L)
  • 1550-7998
  • 1550-2368
DOI
10.1103/physrevd.74.043505
OpenAlex
W2008285666
Cited by
59
References
67
Citations by year
2026: 1 · 2024: 1 · 2022: 1 · 2021: 3 · 2020: 1 · 2019: 3 · 2018: 1 · 2017: 1 · 2016: 6 · 2015: 1 · 2014: 2 · 2013: 2 · 2012: 5
FWCI
2.49
Type
journal article
Language
en
Open access
Licence
link.aps.org/licenses/aps-default-license (vor)
Locations
  • Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields (publishedVersion)
  • arXiv (Cornell University) (publishedVersion)
  • CERN Document Server (European Organization for Nuclear Research) (submittedVersion)
  • arXiv (Cornell University)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
  • Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Dark Matter and Cosmic Phenomena
Keywords
dark energy clustering, galaxy redshift surveys, galaxy power spectrum, effective sound speed, dark energy equation of state, quintessence, integrated Sachs-Wolfe effect, neutrino degeneracy, Planck satellite, large-scale structure

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