Results 51 to 60 of about 428,876 (333)
Constraints on dark-matter properties from large-scale structure [PDF]
, 2016 We use large-scale cosmological observations to place constraints on the dark-matter pressure, sound speed and viscosity, and infer a limit on the mass of warm-dark-matter particles.
Kunz, Martin +2 more
core +2 more sources
Warm-plus-hot neutrino dark matter [PDF]
Physical Review D, 1995 We investigate a new hybrid-model universe containing two types of dark matter, one ``warm'' and the other ``hot.'' The hot component is an ordinary light neutrino with mass \ensuremath{\sim}25${\mathit{h}}^{2}$ eV while the warm component is a sterile neutrino with mass \ensuremath{\sim}700${\mathit{h}}^{2}$ eV.
, Malaney, , Starkman, , Widrow
openaire +2 more sources
Imprints of Non-thermal Wino Dark Matter on Small-Scale Structure
, 2012 We study how "warm" the wino dark matter is when it is non-thermally produced by the decays of the gravitino in the early Universe. We clarify the energy distribution of the wino at the decay of the gravitino and the energy loss process after their ...
Ibe, Masahiro +2 more
core +1 more source
, 2008 Caustics are a generic feature of the nonlinear growth of structure in the dark matter distribution. If the dark matter were absolutely cold, its mass density would diverge at caustics, and the integrated annihilation probability would also diverge for ...
Alard +23 more
core +1 more source
WARM DARK MATTER MODEL OF GALAXY FORMATION [PDF]
Modern Physics Letters A, 2001 Cold Dark Matter (CDM) models of galaxy formation had been remarkably successful to explain a number of observations in the past decade. However, with both the theoretical modeling and the observations being improved, CDM models have been very recently shown to have excessive clustering on the sub-galactic scale.
openaire +4 more sources
Warm and cold dark matter in a bouncing universe [PDF]
Physical Review D, 2020 14 pages, 4 ...
openaire +2 more sources
Cosmological implications of a Dark Matter self-interaction energy density
, 2010 We investigate cosmological constraints on an energy density contribution of elastic dark matter self-interactions characterized by the mass of the exchange particle and coupling constant.
C. Boehm +3 more
core +1 more source
Halo Cores and Phase Space Densities: Observational Constraints on Dark Matter Physics and Structure Formation [PDF]
, 2000 We explore observed dynamical trends in a wide range of dark matter dominated systems (about seven orders of magnitude in mass) to constrain hypothetical dark matter candidates and scenarios of structure formation.
Allen S. W. +9 more
core +3 more sources
Gravitational waves and dark photon dark matter from axion rotations
Journal of High Energy Physics, 2021 An axion rotating in field space can produce dark photons in the early universe via tachyonic instability. This explosive particle production creates a background of stochastic gravitational waves that may be visible at pulsar timing arrays or other ...
Raymond T. Co +2 more
doaj +1 more source
Early galaxy formation in warm dark matter cosmologies [PDF]
, 2015 We present a framework for high-redshift ($z \geq 7$) galaxy formation that traces their dark matter (DM) and baryonic assembly in four cosmologies: Cold Dark Matter (CDM) and Warm Dark Matter (WDM) with particle masses of $m_x =$ 1.5, 3 and 5 ${\rm keV}$
Dayal, Pratika +2 more
core +1 more source