A new approach to cosmological perturbations in f(R) models

Journal Article · Wed Aug 01 04:00:00 EDT 2012 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2012/08/021· OSTI ID:22279919

Bertacca, Daniele; Bartolo, Nicola; Matarrese, Sabino ^[1]

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1. Dipartimento di Fisica Galileo Galilei, Università di Padova, via F. Marzolo, 8 I-35131 Padova (Italy)

We propose an analytic procedure that allows to determine quantitatively the deviation in the behavior of cosmological perturbations between a given f(R) modified gravity model and a ΛCDM reference model. Our method allows to study structure formation in these models from the largest scales, of the order of the Hubble horizon, down to scales deeply inside the Hubble radius, without employing the so-called 'quasi-static' approximation. Although we restrict our analysis here to linear perturbations, our technique is completely general and can be extended to any perturbative order.

• OSTI ID: 22279919
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 08 Vol. 2012; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
APPROXIMATIONS
ASTROPHYSICS
COSMOLOGICAL CONSTANT
COSMOLOGY
DISTURBANCES
GRAVITATION
NONLUMINOUS MATTER