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Relativistic effects in the large-scale structure with effective dark energy fluids

Barrera-Hinojosa, Cristian; Sapone, Domenico

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Authors

Domenico Sapone



Abstract

We study the imprints of an effective dark energy fluid in the large scale structure of the universe through the observed angular power spectrum of galaxies in the relativistic regime. We adopt the phenomenological approach that introduces two parameters {Q,η} at the level of linear perturbations and allow to take into account the modified clustering (or effective gravitational constant) and anisotropic stress appearing in models beyond ΛCDM . We characterize the effective dark energy fluid by an equation of state parameter w=−0.95 and various sound speed cases in the range 10−6≤ cs2≤ 1, thus covering K-essence and quintessence cosmologies. We calculate the angular power spectra of standard and relativistic effects for these scenarios under the {Q,η} parametrization, and we compare these relative to a fiducial ΛCDM cosmology. We find that, overall, deviations relative to ΛCDM are stronger at low redshift since the behavior of the dark energy fluid can mimic the cosmological constant during matter domination era but departs during dark energy domination. In particular, at z=0.1 the matter density fluctuations are suppressed by up to ~3% for the quintessence-like case, while redshift-space distortions and Doppler effect can be enhanced by ~15% at large scales for the lowest sound speed scenario. On the other hand, at z=2 we find deviations of up to ~5% in gravitational lensing, whereas the Integrated Sachs-Wolfe effect can deviate up to ~17%. Furthermore, when considering an imperfect dark energy fluid scenario, we find that all effects are insensitive to the presence of anisotropic stress at low redshift, and only the Integrated Sachs-Wolfe effect can detect this feature at z=2 and very large scales.

Citation

Barrera-Hinojosa, C., & Sapone, D. (2020). Relativistic effects in the large-scale structure with effective dark energy fluids. Journal of Cosmology and Astroparticle Physics, 2020(03), Article 037. https://doi.org/10.1088/1475-7516/2020/03/037

Journal Article Type Article
Acceptance Date Feb 24, 2020
Online Publication Date Mar 17, 2020
Publication Date Mar 31, 2020
Deposit Date May 14, 2020
Publicly Available Date Mar 29, 2024
Journal Journal of Cosmology and Astroparticle Physics
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 2020
Issue 03
Article Number 037
DOI https://doi.org/10.1088/1475-7516/2020/03/037

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