Results 291 to 300 of about 555,829 (322)
Some of the next articles are maybe not open access.
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 and Heavy Dark Matter from Supercooling
2023We point out that dark matter which is produced non-adiabatically in a phase transition (PT) with fast bubble walls receives a boost in velocity which leads to long free-streaming lengths. We find that this could be observed via the suppressed matter power spectrum for dark matter masses around $10^8 - 10^9$ GeV and energy scales of the PT around $10 ...
Baldes, Iason +2 more
openaire +1 more source
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
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
Experimental searches for hot and cold dark matter
Nuclear Physics B - Proceedings Supplements, 1997A way to fix the overproduction by cold dark matter of small-scale structure in the universe is to add hot dark matter in the form of neutrinos. Unlike cold dark matter, such as supersymmetric neutralinos, which very likely could be detected directly, the nature of the neutrinos must be determined from terrestrial experiments.
openaire +2 more sources
Russian Physics Journal, 2012 Large Extra Dimensions and Hot Dark Matter
2001A neutrino mass-mixing scheme which explains qualitatively all present evidence for neutrino mass (the solar and atmospheric neutrino deficits, LSND, and significant hot dark matter) also successfully avoids the “alpha effect”, allowing r-process nucleosynthesis in the neutrino-heated ejecta of supernovae. The properties of neutrinos required to ensure
openaire +2 more sources