Leptonic dark matter annihilation in the evolving universe: constraints and implications

Abstract

The cosmic electron and positron excesses have been explained as possible dark matter (DM) annihilation products. In this work we investigate the possible effects of such a DM annihilation scenario during the evolution history of the Universe. We first calculate the extragalactic $\gamma$-ray background (EGRB), which is produced through the final state radiation of DM annihilation to charged leptons and the inverse Compton scattering between electrons/positrons and the cosmic microwave background. The DM halo profile and the minimal halo mass, which are not yet well determined from the current N-body simulations, are constrained by the EGRB data from EGRET and Fermi telescopes. Then we discuss the impact of such leptonic DM models on cosmic evolution, such as the reionization and heating of intergalactic medium, neutral Hydrogen 21 cm signal and suppression of structure formation. We show that the impact on the Hydrogen 21 cm signal might show interesting signatures of DM annihilation, but the influence on star formation is not remarkable. Future observations of the 21 cm signals could be used to place new constraints on the properties of DM.

24 pages, 6 figures and 2 tables. Improved treatment of the energy deposition process, the suppression on structure formation is weaker. Accepted for publication by JCAP

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Cited by in corpus (32)

• Probing the stability of superheavy dark matter particles with high-energy neutrinos
• Novel Constraints on Mixed Dark-Matter Scenarios of Primordial Black Holes and WIMPs
• Cosmological constraints on dark matter models with velocity-dependent annihilation cross section
• Investigating Gamma-Ray Lines from Dark Matter with Future Observatories
• Implications of the Fermi-LAT diffuse gamma-ray measurements on annihilating or decaying Dark Matter
• The 21 cm signal and the interplay between dark matter annihilations and astrophysical processes
• Massive and supermassive black holes in the contemporary and early universe and the new problems of cosmology and astrophysics
• Impact of Primordial Ultracompact Minihaloes on the Intergalactic Medium and First Structure Formation
• Annihilation vs. Decay: Constraining dark matter properties from a gamma-ray detection
• Warm dark matter and the ionization history of the Universe
• Constraints on Dark Matter Annihilation/Decay from the Isotropic Gamma-Ray Background
• Probing the effects of primordial black holes on 21-cm EDGES signal along with interacting dark energy and dark matter - baryon scattering
• Constraint on the velocity dependent dark matter annihilation cross section from Fermi-LAT observations of dwarf galaxies
• Indirect and direct signatures of Higgs portal decaying vector dark matter for positron excess in cosmic rays
• A closer look at CMB constraints on WIMP dark matter
• Contributions of dark matter annihilation to the global 21cm spectrum observed by the EDGES experiment
• Reionization in the Warm Dark Matter Model
• Bounds on abundance of primordial black hole and dark matter from EDGES 21-cm signal
• Constraints on primordial black holes and curvature perturbations from the global 21cm signal
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• Global 21-cm brightness temperature in viscous dark energy models
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• Constraining PBH mass distributions from 21cm brightness temperature results and an analytical mapping between probability distribution of 21cm signal and PBH masses
• HI absorption from the epoch of reionization and primordial magnetic fields
• Signatures of particle decay in 21 cm absorptions from first minihalos
• Constraints on Dark Matter annihilation and Its Equation of State after Planck Data
• Influence of the deviation of the matter power spectrum at small scales on the global 21-cm signal at cosmic dawn