Constraining Gravitational Dark Matter with LHAASO and Fermi-LAT

2025/12/10 by Barman, Basabendu, Das, Arindam, Sarmah, Prantik +1
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2512.09997

Abstract

We use diffuse Galactic high energy gamma ray data from LHAASO and Fermi-LAT to constrain gravitationally produced decaying dark matter (DM). Focusing on four benchmark candidates: a dark photon, a heavy right-handed neutrino (RHN), a pseudo-Nambu-Goldstone boson (pNGB), and a non-minimally coupled scalar we derive bounds on the DM mass and its couplings to the visible sector. For dark photons, RHNs, and pNGBs, the combined data constrain the relevant interaction strength to \lesssimO(10^-30) for DM masses \gtrsimO(TeV), while the non-minimally coupled scalar is limited to \lesssimO(10^-10). Moreover, photon-dark photon oscillations yield strong constraints for massive dark photon beyond 10 GeV, closing a region of parameter space previously left unconstrained.

Citations

• Breaking Dark: Hunting Heavy Decaying Dark Matter with Tibet AS_γ and LHAASO-KM2A
• What KM3-230213A events may tell us about the neutrino mass and dark matter
• Dark Photon-Photon Resonance Conversion of GRB221009A through Extra Dimension
• The Role of Vectors in Reheating
• Photon-Dark Photon Conversion with Multiple Level Crossings
• The Structure of Dark Matter Halos in Dwarf Galaxies

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