Indirect evidence of GeV dark matter

Abstract

Recently, an excess of GeV gamma ray near the Galactic Centre has been reported. The spectrum obtained can be best fitted with the annihilation of 30 − 40 GeV dark matter particles through bb channel. In this letter, I show that this annihilation model can also solve the mysteries of heating source in x-ray plasma and the unexpected high gamma-ray luminosity. The cross section constrained by these observations give excellent agreements with both the predicted range by using Fermi-LAT data and the canonical thermal relic abundance cross section.Galactic Centre. This evidence can further support the dark matter annihilation model and constrain the cross section and rest mass of the dark matter particles.

Observational Constraints of 30–40 GeV Dark Matter Annihilation in Galaxy Clusters

“…On the other hand, it can be shown that the annihilation of dark matter particles can also provide the required energy source of soft and hard components of hot plasma in the Galactic Centre. The predicted cross section is ⟨ V⟩ ≈ (2-6)× 10 −26 cm 3 s −1 [19]. All these results are generally consistent with each other and satisfy the constraints from cosmic microwave background and low-redshift data [20].…”

Does the gamma-ray signal from the central Milky Way indicate Sommerfeld enhancement of dark matter annihilation?

“…This work is further supported by a later study which includes consideration of foreground and background uncertainties (Calore et al 2015). On the other hand, Chan (2015) showed that this dark matter model can also explain the origin of hot gas near the Galactic center.…”