Journal ArticleDOI
Cosmic rays from primordial black holes
Jane H. MacGibbon,Bernard Carr +1 more
TLDR
The quark and gluon emission from primordial black holes (PBHs) was investigated in this article, where it was found that the emission can explain or contribute significantly to the extragalactic photon and interstellar cosmic-ray electron, positron, and antiproton spectra around 1-1 GeV.Abstract:
The quark and gluon emission from primordial black holes (PBHs) which may have formed from initial density perturbations or phase transitions in the early universe are investigated If the PBHs formed from scale-invariant initial density perturbations in the radiation dominated era, it is found that the emission can explain or contribute significantly to the extragalactic photon and interstellar cosmic-ray electron, positron, and antiproton spectra around 01-1 GeV In particular, the PBH emission strongly resembles the cosmic-ray gamma-ray spectrum between 50 and 170 MeV The upper limits on the PBH density today from the gamma-ray, e(+), e(-), and antiproton data are comparable, provided that the PBHs cluster to the same degree as the other matter in the Galactic haloread more
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Journal ArticleDOI
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.
Journal ArticleDOI
Reconstructing the inflaton potential—an overview
TL;DR: In this paper, the relation between the inflationary potential and the spectra of density waves (scalar perturbations) and gravitational waves (tensor perturbation) produced, with particular emphasis on the possibility of reconstructing the inflaton potential from observations, is discussed.
Journal ArticleDOI
Primordial Black Holes as Dark Matter: Recent Developments
Bernard Carr,Florian Kuhnel +1 more
TL;DR: Although the dark matter is usually assumed to be made up of some form of elementary particle, primordial black holes (PBHs) could also provide some of it as mentioned in this paper.
Journal ArticleDOI
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.
Journal ArticleDOI
Cosmic Rays and Particle Physics
TL;DR: The study of high energy cosmic rays is a diversified field of observational and phenomenological physics addressing questions ranging from shock acceleration of charged particles in various astrophysical objects, via transport properties through galactic and extragalactic space, to questions of dark matter, and even to those of particle physics beyond the Standard Model including processes taking place in the earliest moments of our Universe as discussed by the authors.