Zobrazeno 1 - 10
of 70
pro vyhledávání: '"Gannouji, R."'
Publikováno v:
Phys. Rev. D 101, 103501 (2020)
We analyze the global behaviour of the growth index of cosmic inhomogeneities in an isotropic homogeneous universe filled by cold non-relativistic matter and dark energy (DE) with an arbitrary equation of state. Using a dynamical system approach, we
Externí odkaz:
http://arxiv.org/abs/1912.06958
Publikováno v:
Phys. Rev. D 100, 083503 (2019)
We perform here a global analysis of the growth index $\gamma$ behaviour from deep in the matter era till the far future. For a given cosmological model in GR or in modified gravity, the value of $\gamma(\Omega_{m})$ is unique when the decaying mode
Externí odkaz:
http://arxiv.org/abs/1908.00117
We consider symmetron model in a generalized background with a hope to make it compatible with dark energy. We observe a "no go" theorem at least in case of a conformal coupling. Being convinced of symmetron incapability to be dark energy, we try to
Externí odkaz:
http://arxiv.org/abs/1211.2289
Publikováno v:
PLB 716,255-259(2012)
We study quantum stability bound on the mass of scalaron in generic theories of $f(R)$ gravity. We show that in these scenarios, the scalaron mass increases faster with local density of the environment than one loop quantum correction to it thereby l
Externí odkaz:
http://arxiv.org/abs/1206.3395
Publikováno v:
Phys.Rev.D80:043523,2009
The $f(R)$ gravity models proposed by Hu-Sawicki and Starobinsky are generic for local gravity constraints to be evaded. The large deviations from these models either result into violation of local gravity constraints or the modifications are not dis
Externí odkaz:
http://arxiv.org/abs/0906.2460
Publikováno v:
JCAP 0902:034,2009
We consider the linear growth of matter perturbations on low redshifts in some $f(R)$ dark energy (DE) models. We discuss the definition of dark energy (DE) in these models and show the differences with scalar-tensor DE models. For the $f(R)$ model r
Externí odkaz:
http://arxiv.org/abs/0809.3374
We present here some recent results concerning scalar-tensor Dark Energy models. These models are very interesting in many respects: they allow for a consistent phantom phase, the growth of matter perturbations is modified. Using a systematic expansi
Externí odkaz:
http://arxiv.org/abs/astro-ph/0701650
Akademický článek
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Akademický článek
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We analyze the global behaviour of the growth index of cosmic inhomogeneities in an isotropic homogeneous universe filled by cold non-relativistic matter and dark energy (DE) with an arbitrary (and not universal necessarily) equation of state. Using
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::c58ce2e1e34e6eabf51e19fd89621fc9
https://hal.archives-ouvertes.fr/hal-02423733
https://hal.archives-ouvertes.fr/hal-02423733