Results 221 to 230 of about 32,079 (250)
Discreteness effects in simulations of hot/warm dark matter
Monthly Notices of the Royal Astronomical Society, 2007 In Hot or Warm Dark Matter universes the density fluctuations at early times contain very little power below a characteristic wavelength related inversely to the particle mass. We study how discreteness noise influences the growth of nonlinear structures smaller than this coherence scale in N-body simulations of cosmic structure formation.
Jie Wang +2 more
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Science, 2012
Astronomers still don't know what the unseen "dark matter" is that provides the gravity that holds the galaxies together, but they may soon be able to narrow in on its most basic properties.
Adrian Cho
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Astronomers still don't know what the unseen "dark matter" is that provides the gravity that holds the galaxies together, but they may soon be able to narrow in on its most basic properties.
Adrian Cho
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Nuclear Physics B - Proceedings Supplements, 1995
The Cold + Hot Dark Matter (CHDM) model appears to require about 5 eV of neutrino mass in order to produce early enough galaxy formation. Recent experimental data suggests that this neutrino mass may be divided between two species of neutrinos, each with mass of about 2.4 eV.
Joel R. Primack +3 more
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The Cold + Hot Dark Matter (CHDM) model appears to require about 5 eV of neutrino mass in order to produce early enough galaxy formation. Recent experimental data suggests that this neutrino mass may be divided between two species of neutrinos, each with mass of about 2.4 eV.
Joel R. Primack +3 more
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Interference with gravitational instability: Hot and fuzzy dark matter
Physical Review DWave or fuzzy dark matter produced with high momenta behaves in many ways like hot particle dark matter while also possessing seemingly different phenomenology due to wave interference. We develop wave perturbation theory to show that white noise density fluctuations generated by the interference of high-momenta waves are gravitationally unstable in ...
Rayne Liu, Huangyu Xiao, Wayne Hu
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A Little Hot Dark Matter Matters
Science, 1998Astronomers believe that a large part of the mass in the universe is "dark." But what is the nature of this unseen mass? In his research commentary, Primack discusses results reported in the same issue by Gawiser and Silk in which several models of dark matter were examined.
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Nuclear Physics B - Proceedings Supplements, 2000
Abstract Direct observations favor a low-mass-density universe, but a critical density universe with a neutrino component of dark matter provides the best model for explaining the observed structure of the universe over more than three orders of magnitude in distance scale.
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Abstract Direct observations favor a low-mass-density universe, but a critical density universe with a neutrino component of dark matter provides the best model for explaining the observed structure of the universe over more than three orders of magnitude in distance scale.
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THE CASE OF 1.5 eV NEUTRINO HOT DARK MATTER [PDF]
The Twelfth Marcel Grossmann Meeting, 2012 3 pages, Proceedings Marcel Grossmann XII, Paris ...
Th M Nieuwenhuizen
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The status of hot dark matter after SNO
Nuclear Physics B - Proceedings Supplements, 2002Abstract While the combined SNO-SuperKamiokande solar results require only the three known active neutrinos, adding the atmospheric neutrino and LSND input would require a fourth, sterile neutrino, ν s . The LSND results, which alone force appreciable hot dark matter, are unlikely to be accommodated by a 3+1 neutrino scheme, so it is important to ...
D.O. Caldwell +2 more
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Galaxy and Structure Formation with Hot Dark Matter and Cosmic Strings
Physical Review Letters, 1987Galaxy and structure formation in a neutrino-dominated universe with cosmic strings is investigated. Strings survive neutrino-free streaming to seed galaxies and clusters. The effective maximum Jeans mass is about 1.5\ifmmode\times\else\texttimes\fi{}${10}^{14}$${n}_{50}^{\mathrm{\ensuremath{-}}4}$${M}_{\ensuremath{\bigodot}}$, lower than in the ...
, Brandenberger +3 more
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