Phenomenology of dark matter annihilation into a long-lived intermediate state

Dark Matter Phenomenology

I review recent developments in the direct and indirect detection of dark matter and new candidates beyond the WIMP paradigm.

CMB and 21-cm signals for dark matter with a long-lived excited state

Heavy Wino-like Neutralino Dark Matter Annihilation into Antiparticles

The lightest neutralino is a viable dark matter (DM) candidate. In this paper we study indirect detection of the wino-like neutralino DM using positrons and antiprotons from the annihilation in the galactic halo. When the mass is around 2 TeV, which is favored from the thermal relic abundance, the nonperturbation effect significantly enhances the annihilation cross sections into positrons and a...

Dark matter annihilation into γ−ray line generated by anomalies

We study the phenomenology of a UX(1) extension of the Standard Model where the SM particles are not charged under the new abelian group. The Green-Schwarz mechanism insures that the model is anomaly free. The erstwhile invisible dark gauge field X , even if produced with difficulty at the LHC has however a clear signature in gamma-ray telescopes. We investigate what BSM scale (which can be int...

Long Lived Superheavy Dark Matter with Discrete Gauge Symmetries

The recently observed ultra-high energy (UHE) cosmic rays beyond the Greisen-Zatsepin-Kuzmin bound can be explained by the decays of some superheavy X particles forming a part of dark matter in our universe. We consider various discrete gauge symmetries ZN to ensure the required long lifetime (τX ≃ 10 10−1022 years) of the X particle to explain the UHE cosmic rays in the minimal supersymmetric ...