Journal
PHYSICAL REVIEW D
Volume 77, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.77.103524
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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. This generalization facilitates the adaptation of Einstein-Boltzmann codes for solving cosmic microwave background and matter perturbations in the linear regime. We use such a code to study the effect of metric evolution on the cosmic microwave background through the integrated Sachs-Wolfe effect. We discuss the ability of modified gravity to 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 the Wilkinson Microwave Anisotropy Probe on modified gravity models of the acceleration.
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