Results 161 to 170 of about 28,541 (177)
Some of the next articles are maybe not open access.
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.
Jon A. Holtzman +3 more
openaire +2 more sources
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.
Jon A. Holtzman +3 more
openaire +2 more sources
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.
openaire +2 more sources
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.
openaire +2 more sources
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.
openaire +2 more sources
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.
openaire +2 more sources
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.
openaire +2 more sources
2004
Dark matter made of light neutrinos, with massesof a few electron-volts (eV) or less, is called`hot dark matter' (HDM) by cosmologists. Lightneutrinos would have been `hot', moving at nearlythe speed of light, in the early universe.
openaire +2 more sources
Dark matter made of light neutrinos, with massesof a few electron-volts (eV) or less, is called`hot dark matter' (HDM) by cosmologists. Lightneutrinos would have been `hot', moving at nearlythe speed of light, in the early universe.
openaire +2 more sources
SINGLET NEUTRINOS AS HOT DARK MATTER
Modern Physics Letters A, 1993A model is presented that generates mass and magnetic moment matrices for singlet neutrinos radiatively at one-loop level. It allows the singlet neutrinos to account for the hot dark matter and the anomalous ionization of interstellar hydrogen.
openaire +2 more sources
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 ...
S. J. Yellin +2 more
openaire +2 more sources
HOT GAS AND DARK MATTER IN GALAXIES AND CLUSTERS
Exploring the Universe, 2000We summarize the pioneering work in the study of galaxies and clusters of galaxies made possible by the advent of imaging X-ray astronomy that was realized with the launch of the Einstein Observatory. We emphasize the uniqueness of the contributions from X-ray astronomy and focus on the discovery of hot coronae and dark halos around early-type galaxies
C. Jones, W. Forman
openaire +2 more sources
EXPERIMENTS ON WIMPS, SIMPS, AND HOT DARK MATTER
International Journal of Modern Physics D, 1994The particle which constitutes more than 90% of the mass of the universe is not one of those in the Standard Model of particle physics. The search for this dark matter particle has now eliminated or severely restricted many candidates. While accelerator-produced results and indirect searches have helped, the most extensive exclusions have come from ...
openaire +2 more sources
MAPPING DARK MATTER IN HOT STELLAR SYSTEMS
International Journal of Modern Physics D, 1994Recent work on the dynamics of elliptical galaxies suggests that it is possible to determine the radial distribution of mass in hot stellar systems using only line-of-sight velocities of a sample of stars, without any a priori assumptions about either the relative distribution of dark and luminous components, or the stellar velocity distribution.
openaire +2 more sources