Constraints on the Cosmological Relativistic Energy Density

Details Constraints on the Cosmological Relativistic Energy Density Constraints on the Cosmological Relativistic Energy Density

2001-10-24

arxiv.org/abs/astro-ph/0110533v2

Phys.Rev. D65 (2002) 063506

Astronomy and Astrophysics

Astrophysics

9 pages, 5 figures. Minor changes to reflect referee's comments. Accepted for publication in Phys. Rev. D. Scheduled for 15 Ma

Scientific paper

10.1103/PhysRevD.65.063506

We discuss bounds on the cosmological relativistic energy density as a function of redshift, reviewing the big bang nucleosynthesis and cosmic microwave background bounds, updating bounds from large scale structure, and introducing a new bound from the magnitude-redshift relation of Type Ia supernovae. We conclude that the standard and well-motivated assumption that relativistic energy is negligible during recent epochs is not necessitated by extant data. We then demonstrate the utility of these bounds by constraining the mass and lifetime of a hypothetical massive big bang relic particle.

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