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Stronger Constraints on Primordial Black Holes as Dark Matter Derived from the Thermal Evolution of the Intergalactic Medium over the Last Twelve Billion Years
Nabendu Kumar Khan, Anupam Ray, Girish Kulkarni +1
Primordial black holes (PBHs) have been explored as potential dark matter candidates, with various astrophysical observations placing upper limits on the fraction …
Constraining primordial black holes as dark matter using the global 21-cm signal with X-ray heating and excess radio background
Shikhar Mittal, Anupam Ray, Girish Kulkarni +1
Using the global 21-cm signal measurement by the EDGES collaboration, we derive constraints on the fraction of the dark matter that is in the form of primordial black holes (PBHs)…
Ballistic Dark Matter oscillates above CDM
Anirban Das, Basudeb Dasgupta, Rishi Khatri
Dark matter may have been relativistic and collisional until relatively late times and become cold and collisionless after a phase transition before the matter-radiation equality o…
Resolving Small-Scale Dark Matter Structures Using Multi-Source Indirect Detection
Kenny C. Y. Ng, Ranjan Laha, Sheldon Campbell +4
The extragalactic dark matter (DM) annihilation signal depends on the product of the clumping factor, <δ^2>, and the velocity-weighted annihilation cross section, σv. This "clumpin…
Galactic Center Radio Constraints on Gamma-Ray Lines from Dark Matter Annihilation
Ranjan Laha, Kenny Chun Yu Ng, Basudeb Dasgupta +1
Recent evidence for one or more gamma-ray lines at ~ 130 GeV in the Fermi-LAT data from the Galactic Center has been interpreted as a hint for dark matter annihilation to Zγ or Hγ…