%0 Journal Article
%T The dispersion of growth of matter perturbations in f(R) gravity
%+ Laboratoire de Physique Théorique et Astroparticules (LPTA)
%A Tsujikawa, Shinji
%A Gannouji, Radouane
%A Moraes, Bruno
%A Polarski, David
%< avec comité de lecture
%Z 09-076
%@ 1550-7998
%J Physical Review D
%I American Physical Society
%V 80
%N 8
%P 084044
%8 2009-10-29
%D 2009
%Z 0908.2669
%R 10.1103/PhysRevD.80.084044
%K Astrophysics
%K Cosmology and Extragalactic Astrophysics
%K Phenomenology
%K High Energy Physics
%K Theory
%K General Relativity and Quantum Cosmology
%Z PACS: 04.50.Kd; 95.36.+x; 98.80.Cq
%Z Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]
%Z Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]
%Z Physics [physics]/General Relativity and Quantum Cosmology [gr-qc]
%Z Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
%Z Physics [physics]/High Energy Physics - Theory [hep-th]Journal articles
%X We study the growth of matter density perturbations delta_m for a number ofviable f(R) gravity models that satisfy both cosmological and local gravityconstraints, where the Lagrangian density f is a function of the Ricci scalarR. If the parameter m=Rf_{,RR}/f_{,R} today is larger than the order of10^{-6}, linear perturbations relevant to the matter power spectrum evolve witha growth rate s=d (ln delta_m)/d (ln a) (a is the scale factor) that is largerthan in the LCDM model. We find the window in the free parameter space of ourmodels for which spatial dispersion of the growth index gamma_0= gamma(z=0) (zis the redshift) appears in the range of values 0.40< gamma_0<0.55, as well asthe region in parameter space for which there is essentially no dispersion andgamma_0 converges to values around 0.40
%G English
%L hal-00430268
%U https://hal.science/hal-00430268
%~ IN2P3
%~ LPTA
%~ CNRS
%~ UNIV-MONTP2
%~ UNIV-MONTPELLIER
%~ UM1-UM2