Parametrized Post-Friedmann Signatures of Acceleration in the CMB

Details Parametrized Post-Friedmann Signatures of Acceleration in the CMB Parametrized Post-Friedmann Signatures of Acceleration in the CMB

2008-01-16

arxiv.org/abs/0801.2433v2

Phys.Rev.D77:103524,2008

Astronomy and Astrophysics

Astrophysics

11 pages, 8 figures, changes reflect PRD published version, several typos corrected thanks to Wenjuan Fang

Scientific paper

10.1103/PhysRevD.77.103524

We extend the covariant, parametrized post-Friedmann treatment of cosmic acceleration from modified gravity to an arbitrary admixture of matter, radiation, relativistic components and spatial curvature. Explicit expressions in the comoving, Newtonian and synchronous gauges facilitate the adaptation of Einstein-Boltzmann codes for solving CMB and matter perturbations in the linear regime. Using a comoving gauge code, we study the effect of metric evolution on the CMB through the integrated Sachs-Wolfe effect. Modified gravity can alter the low multipole spectrum, including lowering the power in the quadrupole. From a principal component description of the primary metric ratio parameter, we obtain general constraints from WMAP on modified gravity models of the acceleration.

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