CMB data constraint on self-annihilation of dark matter particles

TL;DR

This paper uses recent CMB data to constrain the self-annihilation rate of dark matter particles, finding no significant evidence but setting upper bounds, with future data expected to improve these constraints.

Contribution

It provides new constraints on dark matter self-annihilation parameters using CMB data and discusses the potential of upcoming observations to refine these limits.

Findings

No statistically significant evidence for dark matter self-annihilation from current CMB data.

Established upper bounds on the annihilation cross-section divided by dark matter mass.

Future observations like Planck and Fermi will enhance the constraints.

Abstract

Recently, self-annihilation of dark matter particles is proposed to explain the "WMAP Haze" and excess of energetic positrons and electrons in ATIC and PAMELA results. If self-annihilation of dark matter occurs around the recombination of cosmic plasma, energy release from self-annihilation of dark matter delays the recombination, and hence affects CMB anisotropy. By using the recent CMB data, we have investigated the self-annihilation of dark matter particles. In this investigation, we do not find statistically significant evidence, and impose an upper bound on <sigma v> / m_chi. The upcoming data from Planck surveyor and the Fermi Gamma-ray telescope will allow us to break some of parameter degeneracy and improve constraints on self-annihilation of dark matter particles.