Mapping the allowed parameter space for decaying dark matter models

Details Mapping the allowed parameter space for decaying dark matter models Mapping the allowed parameter space for decaying dark matter models

2010-01-21

arxiv.org/abs/1001.3870v3

Phys.Rev.D81:083511,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

14 pages, 5 figures, references added, replaced to match version published in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.81.083511

I consider constraints on a phenomenological decaying-dark-matter model, in which two weakly-interacting massive particle (WIMP) species have a small mass splitting, and in which the heavier particle decays to the lighter particle and a massless particle on cosmological timescales. The decay parameter space is parameterized by $v_k$, the speed of the lighter particle in the center-of-mass frame of the heavier particle prior to decay, and the decay time $\tau$. Since I consider the case in which dark-matter halos have formed before there has been significant decay, I focus on the effects of decay in already-formed halos. I show that the $v_k-\tau$ parameter space may be constrained by observed properties of dark-matter halos. I highlight which set of observations is likely to yield the cleanest constraints on $v_k-\tau$ parameter space, and calculate the constraints in those cases in which the effect of decay on the observables can be calculated without N-body simulations of decaying dark matter. I show that for $v_k \gtrsim 5\times 10^3$ km s$^{-1}$, the z=0 galaxy cluster mass function and halo mass-concentration relation constrain $\tau \gtrsim$ 40 Gyr, and that precise constraints on $\tau$ for smaller $v_k$ will require N-body simulations.

Affiliated with

Also associated with

No associations

Rating

Mapping the allowed parameter space for decaying dark matter models 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 Mapping the allowed parameter space for decaying dark matter models, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mapping the allowed parameter space for decaying dark matter models will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-249688