scholarly journals Constraining primordial black hole fraction at the galactic centre using radio observational data

2020 ◽  
Vol 497 (1) ◽  
pp. 1212-1216
Author(s):  
Man Ho Chan ◽  
Chak Man Lee
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Minor Component ◽  
Cosmic Ray ◽  
Galactic Centre ◽  
Primordial Black Hole ◽  
Primordial Black Holes ◽  
Mass Distributions ◽  
Large Parameter Space ◽  
Hole Fraction

ABSTRACT Recent gamma-ray and cosmic-ray observations have put strong constraints on the amount of primordial black holes (PBHs) in our universe. In this paper, we use the archival radio data of the inner Galactic Centre to constrain the PBH to dark matter ratio for three different PBH mass distributions including monochromatic, lognormal, and power law. We show that the amount of PBHs only constitutes a very minor component of dark matter at the Galactic Centre for a large parameter space.

scholarly journals Astroparticle Physics with H.E.S.S.: recents results and nearfuture prospects

2019 ◽  
Vol 209 ◽  
pp. 01054
Author(s):  
Emmanuel Moulin
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Lorentz Invariance ◽  
Cosmic Ray ◽  
High Energy ◽  
New Physics ◽  
Galactic Centre ◽  
Astroparticle Physics ◽  
Dark Matter Search ◽  
Physics Program

H.E.S.S. is an array of five Imaging Atmospheric Cherenkov Telescopes located in Namibia. It is designed for observations of astrophysical sources emitting very-high-energy (VHE) gamma rays in the energy range from a few ten GeVs to several ten TeVs. The H.E.S.S. instrument consists of four identical 12 m diameter telescopes and a 28 m diameter telescope placed at the center of the array. An ambitious Astroparticle Physics program is being carried out by the H.E.S.S. collaboration searching for New Physics in the VHE gamma-ray sky. The program includes the search for WIMP dark matter and axion-like particles, tests of Lorentz invariance, cosmic-ray electron measurements, and search for intergalactic magnetic fields. I will present the latest results on dark matter search from the observations of the Galactic Centre region, the search for Lorentz invariance violation with the 2014 flare observation of Markarian 501, and the first measurement of the cosmic-ray electron spectrum up to 20 TeV. The future of the H.E.S.S. Astroparticle Physics program will be discussed.

scholarly journals Dark matter around primordial black hole at the radiation-dominated stage

2020 ◽  
Vol 35 (02n03) ◽  
pp. 2040046 ◽  
Author(s):  
Yu. N. Eroshenko
Keyword(s):  
Black Hole ◽  
Dark Matter ◽  
Gamma Ray ◽  
Equation Of Motion ◽  
Matter Density ◽  
Primordial Black Hole ◽  
Primordial Black Holes ◽  
Dark Matter Annihilation ◽  
Self Consistent ◽  
Density Growth

The accumulation of dark matter particles near the primordial black holes starts at the radiation-dominated cosmological stage and produces the central density spikes. The spikes can be the bright gamma-ray sources due to dark matter annihilation. We present the self-consistent derivation of the equation of motion of particle in the metrics of primordial black hole immersed into cosmological background. By numerical solution of this equation we find the central dark matter density profile. The density growth is suppressed in the central part of the profile compared with previous calculations.

scholarly journals A constraint on light primordial black holes from the interstellar medium temperature

2021 ◽  
Author(s):  
Hyungjin Kim
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Dwarf Galaxy ◽  
Dark Matter Candidate ◽  
Primordial Black Hole ◽  
Primordial Black Holes ◽  
Substantial Fraction ◽  
Interstellar Gas ◽  
Medium Temperature ◽  
Fast Electrons

Abstract Primordial black holes are a viable dark matter candidate. They decay via Hawking evaporation. Energetic particles from the Hawking radiation interact with interstellar gas, depositing their energy as heat and ionization. For a sufficiently high Hawking temperature, fast electrons produced by black holes deposit a substantial fraction of energy as heat through the Coulomb interaction. Using the dwarf galaxy Leo T, we place an upper bound on the fraction of primordial black hole dark matter. For M < 5 × 10−17M⊙, our bound is competitive with or stronger than other bounds.

scholarly journals Primordial black holes as dark matter: converting constraints from monochromatic to extended mass distributions

2018 ◽  
Vol 2018 (01) ◽  
pp. 004-004 ◽  
Author(s):  
Nicola Bellomo ◽  
José Luis Bernal ◽  
Alvise Raccanelli ◽  
Licia Verde
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Primordial Black Holes ◽  
Mass Distributions

scholarly journals Search for Gamma-ray Line emission from Dark Matter annihilation in the Galactic Centre with the MAGIC telescopes

2021 ◽  
Author(s):  
Tomohiro Inada ◽  
Ana Babic ◽  
Andrés Baquero ◽  
Ivana Batković ◽  
Josefa Becerra Gonzalez ◽  
...  
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Line Emission ◽  
Galactic Centre ◽  
Dark Matter Annihilation

scholarly journals Diffuse gamma-ray background and cosmic-ray positrons from annihilating dark matter

2009 ◽  
Vol 80 (2) ◽  
Author(s):  
Masahiro Kawasaki ◽  
Kazunori Kohri ◽  
Kazunori Nakayama
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Cosmic Ray
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