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A new approach to cosmological perturbations in f(R) models
Daniele Bertacca, Nicola Bartolo, Sabino Matarrese
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…
CMB-Galaxy correlation in Unified Dark Matter Scalar Field Cosmologies
Daniele Bertacca, Alvise Raccanelli, Oliver F. Piattella +4
We present an analysis of the cross-correlation between the CMB and the large-scale structure (LSS) of the Universe in Unified Dark Matter (UDM) scalar field cosmologies. We work o…
Gravitational potential evolution in Unified Dark Matter Scalar Field Cosmologies: an analytical approach
Oliver F. Piattella, Daniele Bertacca
We investigate the time evolution of the gravitational potential Phi for a special class of non-adiabatic Unified Dark matter Models described by scalar field lagrangians. These mo…