WMAP Constraints on Decaying Cold Dark Matter

Details WMAP Constraints on Decaying Cold Dark Matter WMAP Constraints on Decaying Cold Dark Matter

2004-03-06

arxiv.org/abs/astro-ph/0403164v2

Phys.Rev.Lett. 93 (2004) 071302

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures, typos corrected, results unchanged, accepted for publication in PRL

Scientific paper

10.1103/PhysRevLett.93.071302

We re-formulate cosmological perturbations in the decaying cold dark matter model, and calculate cosmological microwave background (CMB) anisotropies. By comparing our theoretical predictions with recent observational data from the Wilkinson Microwave Anisotropy Probe(WMAP), we derive a new bound on the abundance and lifetime of decaying dark matter particles. We show that the data of WMAP alone do not prefer the decaying cold dark matter model: the lifetime is constrained to \Gamma^{-1}> 123 Gyr at 68% C.L. (52 Gyr at 95.4% C.L.) when cold dark matter consists only of such decaying particles. We also consider a more general case in which cold dark matter consists of both stable and decaying particles, and show that the constraint generalizes down to \Omega_{DDM}h^2 < -0.5 (Gamma^{-1}/1 Gyr)^{-1}+0.12 for \Gamma^{-1} > 5 Gyr at 95.4% C.L.. These bounds are robust and widely applicable, because they are derived only from gravitational effects and therefore do not rely on the details of decay channels or decay products.

Affiliated with

Also associated with

No associations

Rating

WMAP Constraints on Decaying Cold Dark Matter does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with WMAP Constraints on Decaying Cold Dark Matter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and WMAP Constraints on Decaying Cold Dark Matter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-653664