Parametrized post-Friedmann signatures of acceleration in the CMB

Journal Article · Thu May 15 04:00:00 EDT 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.77.103524· OSTI ID:21204981

Hu, Wayne ^[1]

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1. Kavli Institute for Cosmological Physics, Department of Astronomy, and Astrophysics, Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637 (United States)

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.

• OSTI ID: 21204981
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 10 Vol. 77; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COMPUTER CODES
DISTURBANCES
GRAVITATION
PERTURBATION THEORY
QUADRUPOLES
RELATIVISTIC RANGE
RELICT RADIATION
SPECTRA