Impact of dark energy perturbations on the growth index

Batista, R.C.

doi:10.1103/physrevd.89.123508

Cited by 36 publications

(37 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, we see that the asymptotic value of growth index γ ∞ of this model is somewhat smaller than that of the ΛCDM model by approximately 3%. This is expected as the agglomerations of DE perturbations usually lowers the value of the growth index [51]. It has been also observed that a redshift dependent parametrization of γ can provide a more accurate fit for the growth rate of matter clustering in comparison to a constant parametrization.…”

Section: Constant Growth Indexmentioning

confidence: 88%

Linear growth index of matter perturbations in Rastall gravity

Khyllep

Dutta

2019

Physics Letters B

View full text Add to dashboard Cite

Rastall gravity theory shows notable features consistent with physical observations in comparison to the standard Einstein theory. Recently, there has been a debate about the equivalence of Rastall gravity and general relativity.Motivated by this open issue, in the present work, we attempt to shed some light on this debate by analyzing the evolution of the Rastall based cosmological model at the background as well as perturbation level. Employing the dynamical system techniques, we found that at late times, the dynamics of the model resembles the ΛCDM model at the background level irrespective of the choice of Rastall's parameter. However, at the perturbation level, we found that the evolution of the growth index heavily depends on the Rastall's parameter and displays a significant deviation from the ΛCDM model. arXiv:1907.09221v1 [gr-qc]

show abstract

Section: Constant Growth Indexmentioning

confidence: 88%

Linear growth index of matter perturbations in Rastall gravity

Khyllep

Dutta

2019

Physics Letters B

View full text Add to dashboard Cite

show abstract

“…Moreover, the growth of cosmic structures are also affected by perturbations of DE when we deal with dynamical DE models with time varying EoS parameter w 1 de ¹ - (Erickson et al 2002;Bean & Doré 2004;Hu & Scranton 2004;Basilakos & Voglis 2007;Mota et al 2007;Ballesteros & Riotto 2008;Basilakos et al 2009aBasilakos et al , 2010Gannouji et al 2010;Sapone & Majerotto 2012;Batista & Pace 2013;Dossett & Ishak 2013;Basse et al 2014;Batista 2014;Nesseris & Sapone 2015;Pace et al 2014aPace et al , 2014bBasilakos 2015;Mehrabi et al 2015aMehrabi et al , 2015bMehrabi et al , 2015cMalekjani et al 2015Malekjani et al , 2017.…”

Section: Introductionmentioning

confidence: 99%

Constraints to Dark Energy Using PADE Parameterizations

Rezaei

Malekjani

Basilakos

et al. 2017

ApJ

View full text Add to dashboard Cite

We put constraints on dark energy (DE) properties using PADE parameterization, and compare it to the same constraints using Chevalier-Polarski-Linder (CPL) and ΛCDM, at both the background and the perturbation levels. The DE equation of the state parameter of the models is derived following the mathematical treatment of PADE expansion. Unlike CPL parameterization, PADE approximation provides different forms of the equation of state parameter that avoid the divergence in the far future. Initially we perform a likelihood analysis in order to put constraints on the model parameters using solely background expansion data, and we find that all parameterizations are consistent with each other. Then, combining the expansion and the growth rate data, we test the viability of PADE parameterizations and compare them with CPL and ΛCDM models, respectively. Specifically, we find that the growth rate of the current PADE parameterizations is lower than ΛCDM model at low redshifts, while the differences among the models are negligible at high redshifts. In this context, we provide for the first time a growth index of linear matter perturbations in PADE cosmologies. Considering that DE is homogeneous, we recover the well-known asymptotic value of the growth index (namely . Finally, we generalize the growth index analysis in the case where γ is allowed to vary with redshift, and we find that the form of z g ( ) in PADE parameterization extends that of the CPL and ΛCDM cosmologies, respectively.

show abstract

“…Recently, there are efforts towards investigating the linear growth of matter perturbations in the context of CLDE (Bean & Dore 2004;Ballesteros & Riotto 2008;Sapone & Kunz 2009;Sapone & Majerotto 2012;Batista & Pace 2013;Dosset & Ishak 2013;Batista 2014;Steigerwald, Bel & Marinoni 2014;Pace, Batista & Del Popolo 2014;Basse et al 2014). From the observational viewpoint, although it is difficult to measure the DE perturbations, it has been found that the homogeneous DE scenario fails to reproduce the observed concentration parameter of the massive galaxy clusters (Basilakos, Sanchez & Perivolaropoulos 2009).…”

Section: Introductionmentioning

confidence: 99%

The growth index of matter perturbations using the clustering of dark energy

Basilakos

2015

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

We have put forward a new unified framework which provides a consistent and rather complete account of the growth index of matter perturbations in the regime where the dark energy is allowed to have clustering. In particular, we find that the growth index is not only affected by the cosmological parameters but rather it depends on the choice of the considered dark energy (homogeneous or clustered). Using the Planck priors and performing a standard χ 2 -minimization between theoretical expectations and growth data, we statistically quantify the ability of the growth index to represent the observations. Finally, based on the growth index analysis we find that the growth data favor the clustered dark energy scenario.

show abstract

Impact of dark energy perturbations on the growth index

Cited by 36 publications

References 35 publications

Linear growth index of matter perturbations in Rastall gravity

Linear growth index of matter perturbations in Rastall gravity

Constraints to Dark Energy Using PADE Parameterizations

The growth index of matter perturbations using the clustering of dark energy

Contact Info

Product

Resources

About