Constraining Decaying Dark Matter

Abstract

We revisited the decaying dark matter (DDM) model, in which one collisionless particle decays early into two collisionless particles, that are potentially dark matter particles today. The effect of DDM will be manifested in the cosmic microwave background (CMB) and structure formation. With a systematic modification of CMB calculation tool \texttt{camb}, we can numerically calculated this effect, and compare it to observations. Further Markov Chain Monte Carlo \texttt{cosmomc} runnings update the constraints in that model: the free streaming length ${\lambda }_{FS}\lesssim 0.5$Mpc for nonrelativistic decay, and $((M_{DDM}/keV)Y{)}^2(T_d/yr)\lesssim 5\times 10^{-5}$ for relativistic decay.

4 pages, 3 figures

References in corpus (5)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Cosmological Constraints from the SDSS Luminous Red Galaxies
• High resolution CMB power spectrum from the complete ACBAR data set
• The 2dF Galaxy Redshift Survey: Final Data Release
• Cosmological Results from Five Years of 30 GHz CMB Intensity Measurements with the Cosmic Background Imager