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Title: Dark energy induced anisotropy in cosmic expansion

Abstract

In order to understand the nature of the accelerating expansion of the late-time universe, it is important to experimentally determine whether dark energy is a cosmological constant or dynamical in nature. If dark energy already exists prior to inflation, which is a reasonable assumption, then one expects that a dynamical dark energy would leave some footprint in the anisotropy of the late-time accelerated expansion. To demonstrate the viability of this notion, we invoke the quintessence field with the exponential potential as one of the simplest dynamical dark energy models allowed by observations. We investigate the effects of its quantum fluctuations (the physical origin of the perturbation being isocurvature) generated during inflation and having fully positive correlation with the primordial curvature perturbations, and estimate the anisotropy of the cosmic expansion so induced. We show that the primordial amplitude of quantum fluctuations of quintessence field δΦ P can be related to the tensor-to-scalar ratio r, and we calculate the perturbed luminosity distance to first order and the associated luminosity distance power spectrum, which is an estimator of anisotropy of late-time accelerated expansion. We find that the gravitational potential at large scales and late times is less decayed in QCDM compared to thatmore » in ΛCDM so that the smaller the redshift and multipole, the more relative deficit of power in QCDM. In conclusion, our results of luminosity distance power spectrum also show the similar conclusions of suppression as that of the previous investigation regarding the effect of quantum fluctuations of quintessence field on the CMB temperature anisotropies.« less

Authors:
 [1];  [2]
  1. National Taiwan Univ., Taipei (Taiwan)
  2. National Taiwan Univ., Taipei (Taiwan); SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1560681
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
European Physical Journal. C, Particles and Fields
Additional Journal Information:
Journal Volume: 79; Journal Issue: 8; Journal ID: ISSN 1434-6044
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Chen, Chien-Ting, and Chen, Pisin. Dark energy induced anisotropy in cosmic expansion. United States: N. p., 2019. Web. doi:10.1140/epjc/s10052-019-7157-x.
Chen, Chien-Ting, & Chen, Pisin. Dark energy induced anisotropy in cosmic expansion. United States. doi:10.1140/epjc/s10052-019-7157-x.
Chen, Chien-Ting, and Chen, Pisin. Wed . "Dark energy induced anisotropy in cosmic expansion". United States. doi:10.1140/epjc/s10052-019-7157-x. https://www.osti.gov/servlets/purl/1560681.
@article{osti_1560681,
title = {Dark energy induced anisotropy in cosmic expansion},
author = {Chen, Chien-Ting and Chen, Pisin},
abstractNote = {In order to understand the nature of the accelerating expansion of the late-time universe, it is important to experimentally determine whether dark energy is a cosmological constant or dynamical in nature. If dark energy already exists prior to inflation, which is a reasonable assumption, then one expects that a dynamical dark energy would leave some footprint in the anisotropy of the late-time accelerated expansion. To demonstrate the viability of this notion, we invoke the quintessence field with the exponential potential as one of the simplest dynamical dark energy models allowed by observations. We investigate the effects of its quantum fluctuations (the physical origin of the perturbation being isocurvature) generated during inflation and having fully positive correlation with the primordial curvature perturbations, and estimate the anisotropy of the cosmic expansion so induced. We show that the primordial amplitude of quantum fluctuations of quintessence field δΦP can be related to the tensor-to-scalar ratio r, and we calculate the perturbed luminosity distance to first order and the associated luminosity distance power spectrum, which is an estimator of anisotropy of late-time accelerated expansion. We find that the gravitational potential at large scales and late times is less decayed in QCDM compared to that in ΛCDM so that the smaller the redshift and multipole, the more relative deficit of power in QCDM. In conclusion, our results of luminosity distance power spectrum also show the similar conclusions of suppression as that of the previous investigation regarding the effect of quantum fluctuations of quintessence field on the CMB temperature anisotropies.},
doi = {10.1140/epjc/s10052-019-7157-x},
journal = {European Physical Journal. C, Particles and Fields},
number = 8,
volume = 79,
place = {United States},
year = {2019},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Fig. 1 Fig. 1: The evolution of the density parameters of matter $Ω$m (dashed red) and of quintessence field $Ω$$\phi$ (solid green)

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.