Results 31 to 40 of about 1,660,126 (341)
‘Excess’ of primary cosmic ray electrons
Physics Letters B, 2015 With the accurate cosmic ray (CR) electron and positron spectra (denoted as Φe− and Φe+, respectively) measured by AMS-02 Collaboration, the difference between the electron and positron fluxes (i.e., ΔΦ=Φe−−Φe+), dominated by the propagated primary ...
Xiang Li +7 more
doaj +1 more source
Physical Review D, 1992 A very weakly coupled scalar field with mass $m$ and initial vacuum expectation value $V$ will provide enough mass to close the universe provided $V\simeq (3\times 10^8\gev)(100\gev/m)^{1/4}$. We discuss possible models in which such a field could arise.
Rangarajan, R., Srednicki, M.
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Convergent Bayesian global fits of 4D composite Higgs models
Journal of High Energy Physics, 2021 Models in which the Higgs boson is a composite pseudo-Nambu-Goldstone boson offer attractive solutions to the Higgs mass naturalness problem. We consider three such models based on the minimal SO(5) → SO(4) symmetry breaking pattern, and perform ...
Ethan Carragher +6 more
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International Journal of Modern Physics A, 2006 More than 90% of matter in the Universe could be composed of heavy particles, which were non-relativistic, or 'cold', when they froze-out from the primordial soup. I will review current searches for these hypothetical particles, both via interactions with nuclei in deep underground detectors, and via the observation of their annihilation products in ...
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Black hole evaporation beyond the Standard Model of particle physics
Journal of High Energy Physics, 2023 The observation of an evaporating black hole would provide definitive information on the elementary particles present in nature. In particular, it could discover or exclude particles beyond those present in the standard model of particle physics.
Michael J. Baker, Andrea Thamm
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Physical Review D, 2010 29 pages, 7 figures, minor updates and references added, version accepted by ...
Graham, Peter W. +3 more
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The Cosmology of Composite Inelastic Dark Matter [PDF]
, 2010 Composite dark matter is a natural setting for implementing inelastic dark matter - the O(100 keV) mass splitting arises from spin-spin interactions of constituent fermions.
A Bottino +85 more
core +3 more sources
International Journal of Modern Physics A, 1994 The hypothesis of an 'invisible' axion was made by Misha Shifman and others, approximately thirty years ago. It has turned out to be an unusually fruitful idea, crossing boundaries between particle physics, astrophysics and cosmology. An axion with mass of order 10-5 eV (with large uncertainties) is one of the leading candidates for the dark matter of
openaire +2 more sources
Gravitational effects of condensate dark matter on compact stellar objects
, 2012 We study the gravitational effect of non-self-annihilating dark matter on compact stellar objects. The self-interaction of condensate dark matter can give high accretion rate of dark matter onto stars.
Cheng, K. S., Li, Xinyu, Wang, Fayin
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WIMP Dark Matter and Baryogenesis
, 2010 In the present universe visible and dark matter contribute comparable energy density although they have different properties. This coincidence can be elegantly explained if the dark matter relic density, originating from a dark matter asymmetry, is fully
Gu, Pei-Hong +3 more
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