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 Scalaron–Higgs inflation reloaded: Higgs-dependent scalaron mass and primordial black hole dark matter

2021 ◽  
Vol 81 (5) ◽  
Author(s):  
Anirudh Gundhi ◽  
Christian F. Steinwachs
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Particle Physics ◽  
Cold Dark Matter ◽  
Higgs Model ◽  
Inflationary Cosmology ◽  
Primordial Black Hole ◽  
Primordial Black Holes ◽  
Elementary Particle Physics ◽  
Field Amplification

AbstractWe propose an extension of the scalaron-Higgs model by a non-minimal coupling of the Standard Model Higgs boson to the quadratic Ricci scalar resulting in a Higgs-dependent scalaron mass. The model predicts a successful stage of effective single-field Starobinsky inflation. It features a multi-field amplification mechanism leading to a peak in the inflationary power spectrum at small wavelengths which enhances the production of primordial black holes. The extended scalaron-Higgs model unifies inflationary cosmology with elementary particle physics and explains the origin of cold dark matter in terms of primordial black holes without assuming any new particles.

scholarly journals Cusp-to-core transition in low-mass dwarf galaxies induced by dynamical heating of cold dark matter by primordial black holes

2020 ◽  
Vol 492 (4) ◽  
pp. 5218-5225
Author(s):  
Pierre Boldrini ◽  
Yohei Miki ◽  
Alexander Y Wagner ◽  
Roya Mohayaee ◽  
Joseph Silk ◽  
...  
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Time Scale ◽  
Mass Fraction ◽  
Cold Dark Matter ◽  
Dwarf Galaxies ◽  
Dwarf Galaxy ◽  
Initial Density ◽  
Primordial Black Holes ◽  
Low Mass

ABSTRACT We performed a series of high-resolution N-body simulations to examine whether dark matter candidates in the form of primordial black holes (PBHs) can solve the cusp–core problem in low-mass dwarf galaxies. If some fraction of the dark matter in low-mass dwarf galaxies consists of PBHs and the rest is cold dark matter, dynamical heating of the cold dark matter by the PBHs induces a cusp-to-core transition in the total dark matter profile. The mechanism works for PBHs in the 25–100 M⊙ mass window, consistent with the Laser Interferometer Gravitational-Wave Observatory (LIGO) detections, but requires a lower limit on the PBH mass fraction of 1 ${{\rm per\ cent}}$ of the total dwarf galaxy dark matter content. The cusp-to-core transition time-scale is between 1 and 8 Gyr. This time-scale is also a constant multiple of the relaxation time between cold dark matter particles and PBHs, which depends on the mass, the mass fraction, and the scale radius of the initial density profile of PBHs. We conclude that dark matter cores occur naturally in haloes composed of cold dark matter and PBHs, without the need to invoke baryonic processes.

scholarly journals The minimum testable abundance of primordial black holes at future gravitational-wave detectors

2021 ◽  
Vol 2021 (11) ◽  
pp. 039
Author(s):  
Valerio De Luca ◽  
Gabriele Franciolini ◽  
Paolo Pani ◽  
Antonio Riotto
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Dark Matter ◽  
Gravitational Wave ◽  
Primordial Black Hole ◽  
Spatial Distributions ◽  
Primordial Black Holes ◽  
Next Generation ◽  
Einstein Telescope ◽  
Gravitational Wave Detectors

Abstract The next generation of gravitational-wave experiments, such as Einstein Telescope, Cosmic Explorer and LISA, will test the primordial black hole scenario. We provide a forecast for the minimum testable value of the abundance of primordial black holes as a function of their masses for both the unclustered and clustered spatial distributions at formation. In particular, we show that these instruments may test abundances, relative to the dark matter, as low as 10-10.

scholarly journals Bounds on warm dark matter from Schwarzschild primordial black holes

2021 ◽  
Vol 136 (2) ◽  
Author(s):  
Jérémy Auffinger ◽  
Isabella Masina ◽  
Giorgio Orlando
Keyword(s):  
Beyond Standard Model ◽  
Black Holes ◽  
Black Hole ◽  
Dark Matter ◽  
Energy Density ◽  
The Other ◽  
Primordial Black Hole ◽  
Primordial Black Holes ◽  
Hole Energy ◽  
Upper Limits

AbstractWe consider light dark matter candidates originated from the evaporation of Schwarzschild primordial black holes, with masses in the range $$10^{-5}$$ 10 - 5 –$$10^9$$ 10 9 g. These candidates are beyond standard model particles with negligible couplings to the other particles, so that they interact only gravitationally. Belonging to the category of warm dark matter, they nevertheless spoil structure formation, with a softer impact for increasing values of the candidate spin. Requiring such candidates to fully account for the observed dark matter, we find that the scenario of black hole domination is ruled out for all spin values up to 2. For the scenario of radiation domination, we derive upper limits on the parameter $$\beta $$ β (the primordial black hole energy density at formation over the radiation one), which are less stringent the higher the candidate spin is.

scholarly journals NANOGrav Data Hints at Primordial Black Holes as Dark Matter

2021 ◽  
Vol 126 (4) ◽  
Author(s):  
V. De Luca ◽  
G. Franciolini ◽  
A. Riotto
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Primordial Black Holes
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