Results 21 to 30 of about 701,414 (343)
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
Hot QCD and warm dark matter [PDF]
Proceedings of XXIVth International Symposium on Lattice Field Theory — PoS(LAT2006), 2006 One of the possible explanations for the dark matter needed in the standard cosmological model is so-called warm dark matter, in the form of right-handed ("sterile") neutrinos with a mass in the keV range.
Laine, M.
core +5 more sources
Polarized equatorial emission and hot spots around black holes with a dark matter halo [PDF]
European Physical Journal C: Particles and FieldsWe study linear polarization of the accretion disks around black holes with a dark matter halo. The interaction of the black hole with the dark matter is modeled by considering an exact solution to the Einstein equations which describe a superposition of
Tsanimir Angelov +4 more
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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
TeV Scale Theory for Cold and Hot Dark Matter [PDF]
, 1994 We show that a recently proposed extension of the MSSM can provide a scenario where both the cold and hot dark matter of the universe owe their origin to a single scale connected with the breakdown of the global B-L symmetry.
R. N. Mohapatra, Antonio Riotto
openalex +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
Cold + Hot Dark Matter and the Cosmic Microwave Background [PDF]
, 1996 We examine the cosmic microwave background power spectrum for adiabatic models with a massive neutrino component. We present the results of a detailed numerical evolution of cold + hot dark matter (CHDM) models and compare with the standard cold dark ...
Scott Dodelson +2 more
openalex +4 more sources
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 +6 more sources
Constraining hot dark matter sub-species with weak lensing and the cosmic microwave background radiation [PDF]
Astronomy & Astrophysics, 2023 Although it is well known that the bulk of dark matter (DM) has to be cold, the existence of an additional sub-dominant, hot species remains a valid possibility.
F. H. Peters +4 more
semanticscholar +1 more source