Results 21 to 30 of about 689,866 (345)
Sterile neutrino dark matter in left-right theories [PDF]
Journal of High Energy Physics, 2020 SU(2) L × SU(2) R gauge symmetry requires three right-handed neutrinos (N i ), one of which, N 1, can be sufficiently stable to be dark matter. In the early universe, W R exchange with the Standard Model thermal bath keeps the right-handed neutrinos in ...
Jeff A. Dror +3 more
doaj +2 more sources
Axions as hot and cold dark matter [PDF]
Journal of Cosmology and Astroparticle Physics, 2014 The presence of a hot dark matter component has been hinted at 3 sigma by a combination of the results from different cosmological observations. We examine a possibility that pseudo Nambu-Goldstone bosons account for both hot and cold dark matter components.
Kwang Sik Jeong +2 more
openalex +8 more sources
Discretely Charged Dark Matter in Inflation Models Based on Holographic Space-Time [PDF]
Universe, 2022 The holographic space-time (HST) model of inflation has a potential explanation for dark matter as tiny primordial black holes. Motivated by a recent paper of Barrau, we propose a version of this model where some of the inflationary black holes (IBHs ...
Tom Banks, Willy Fischler
doaj +2 more sources
Hot Dark Matter in Cosmology [PDF]
, 2000 22 pages, including four postscript figures; to appear in D. O.
Joel R. Primack, Michael Groß
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Hot-dark matter, cold dark matter and accelerating universe
, 2006 The Friedman equation is solved for a universe contains hotdark matter and cold dark matter. In this scenario, hot-dark matter drives an accelerating universe no cold dark matter.
Abbas Farmany +2 more
openalex +4 more sources
European Physical Journal C: Particles and Fields, 2019 The universal lower bound of the ratio of shear viscosity to entropy density is suggested by the string theory and gauge duality for any matter. We examined the ratio of shear viscosity to entropy density for viscous accretion flow towards a central ...
Sandip Dutta, Ritabrata Biswas
doaj +3 more sources
Saxion cosmology for thermalized gravitino dark matter
Journal of High Energy Physics, 2017 In all supersymmetric theories, gravitinos, with mass suppressed by the Planck scale, are an obvious candidate for dark matter; but if gravitinos ever reached thermal equilibrium, such dark matter is apparently either too abundant or too hot, and is ...
Raymond T. Co +3 more
doaj +3 more sources
Future cosmological sensitivity for hot dark matter axions [PDF]
Journal of Cosmology and Astroparticle Physics, 2015 We study the potential of a future, large-volume photometric survey to constrain the axion mass $m_a$ in the hot dark matter limit. Future surveys such as Euclid will have significantly more constraining power than current observations for hot dark matter. Nonetheless, the lowest accessible axion masses are limited by the fact that axions lighter than $
Maria Archidiacono +5 more
openalex +6 more sources
THE CASE OF 1.5 eV NEUTRINO HOT DARK MATTER [PDF]
The Twelfth Marcel Grossmann Meeting, 2012 3 pages, Proceedings Marcel Grossmann XII, Paris ...
Theo M. Nieuwenhuizen
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Axion hot dark matter bounds after Planck [PDF]
Journal of Cosmology and Astroparticle Physics, 2013 We use cosmological observations in the post-Planck era to derive limits on thermally produced cosmological axions. In the early universe such axions contribute to the radiation density and later to the hot dark matter fraction.
M. Archidiacono +4 more
semanticscholar +7 more sources