Primordial black holes in braneworld cosmologies: Astrophysical constraints
TL;DR: In this article, the authors explored the modifications to primordial black hole physics when one moves to the simplest braneworld model, Randall-Sundrum type II, and found that the evaporation law and the cosmological evolution of the population can be modified, and additionally accretion of energy from the background can be dominant over evapolation at high energies.
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Abstract: In two recent papers we explored the modifications to primordial black hole physics when one moves to the simplest braneworld model, Randall-Sundrum type II. Both the evaporation law and the cosmological evolution of the population can be modified, and additionally accretion of energy from the background can be dominant over evaporation at high energies. In this paper we present a detailed study of how this impacts upon various astrophysical constraints, analyzing constraints from the present density, from the present high-energy photon background radiation, from distortion of the microwave background spectrum, and from processes affecting light element abundances both during and after nucleosynthesis. Typically, the constraints on the formation rate of primordial black holes weaken as compared to the standard cosmology if black hole accretion is unimportant at high energies, but can be strengthened in the case of efficient accretion.
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Figures
FIG. 2. The behavior of Eq.~30! as a function of the accretion parameterq for two choices of the ratiol / l min , under the assump tion that the imposed limit at evaporation is identical in the hi 
FIG. 3. The behavior of Eq.~30! as a function of the accretion parameterq for two choices of the ratiol / l min , as appropriate to the helium constraint. This is to be compared with Fig. 2, as the posed limits at evaporation in the high energy and standard tr ments,Levap
Citations
New cosmological constraints on primordial black holes
Bernard Carr,Bernard Carr,Bernard Carr,Kazunori Kohri,Kazunori Kohri,Kazunori Kohri,Yuuiti Sendouda,Yuuiti Sendouda,Jun'ichi Yokoyama,Jun'ichi Yokoyama +9 more
TL;DR: In this article, the fraction of the universe going into primordial black holes in the mass range was studied and the effects of their evaporations on big bang nucleosynthesis and the extragalactic photon background were discussed.
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Brane-World Gravity
Roy Maartens,Kazuya Koyama +1 more
TL;DR: In this article, the authors discuss the geometry, dynamics and perturbations of simple brane-world models for cosmology and astrophysics, mainly focusing on warped 5-dimensional braneworlds based on the Randall-Sundrum models.
Primordial Black Holes
TL;DR: In this article, the mechanisms of primordial black hole formation are discussed and observational constraints on the PBH spectrum, or effects of PBH evaporation, are shown to restrict a wide range of particle physics models, predicting an enhancement of the ultraviolet part of the spectrum of density perturbations.
522
Primordial black holes
TL;DR: In this paper, the mechanisms of primordial black hole formation are discussed and observational constraints on the PBH spectrum, or effects of PBH evaporation, are shown to restrict a wide range of particle physics models, predicting an enhancement of the ultraviolet part of the spectrum of density perturbations.
495
Primordial black holes
TL;DR: In this paper, the mechanisms of primordial black hole formation are discussed and observational constraints on the PBH spectrum, or effects of PBH evaporation, are shown to restrict a wide range of particle physics models, predicting an enhancement of the ultraviolet part of the spectrum of density perturbations.
408
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