Results 21 to 30 of about 32,489 (252)
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
European Physical Journal C: Particles and Fields, 2023 A view is taken up whereby the non-singular Trautman–Kopczyński big-bang creation of the Universe produced a highly torsional hot state at early stages of the cosmic evolution which particularly brought about the formation of a dark matter cloud.
J. G. Cardoso
doaj +1 more source
Cosmological axion and neutrino mass constraints from Planck 2015 temperature and polarization data
Physics Letters B, 2016 Axions currently provide the most compelling solution to the strong CP problem. These particles may be copiously produced in the early universe, including via thermal processes.
Eleonora Di Valentino +5 more
doaj +1 more source
Expanding Culturomics from Gut to Extreme Environmental Settings
mSystems, 2021 With the advent of metagenomics, a quest began to identify the dynamics of the microbial communities in different ecological niches. Altogether, this has resulted in identification of microorganisms but is limited to only a small number of phylogenetic ...
Utkarsh Sood, Roshan Kumar, Princy Hira
doaj +1 more source
Hot Dark Matter in Cosmology [PDF]
, 2001 22 pages, including four postscript figures; to appear in D. O.
Primack, Joel R., Gross, Michael A. K.
openaire +2 more sources
Cosmological Simulation for Fuzzy Dark Matter Model
Frontiers in Astronomy and Space Sciences, 2019 Fuzzy Dark Matter (FDM), motivated by string theory, has recently become a hot candidate for dark matter. The rest mass of FDM is believed to be ~10−22eV and the corresponding de-Broglie wave length is ~1kpc. Therefore, the quantum effect of FDM plays an
Jiajun Zhang, Hantao Liu, Ming-Chung Chu
doaj +1 more source
Massive Dark Photons as Hot Dark Matter
Acta Physica Polonica B, 2022 Motivated by the growing interest in the existence of new massive gauge bosons, we suggest that massive dark photons A0 can be a consequence of a broken new abelian symmetry U(1)'X. Such a dark symmetry U(1)'D is afterwards supposed to be associated with the conservation of the weak number W belonging to the Weakling Interacting Slim Particles U(1)'W ...
openaire +2 more sources
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 +1 more source
The Open Journal of Astrophysics, 2021 We apply the squeezed state formalism to scalar field dark matter (e.g. axion) perturbations generated during inflation. As for the inflationary perturbations, the scalar field state becomes highly squeezed as modes exit the horizon. For as long as $H>m_\
Jondalar L. J. Kuß, David J. E. Marsh
doaj +1 more source
Sterile neutrino dark matter in left-right theories
Journal of High Energy Physics, 2020 SU(2) L × SU(2) R gauge symmetry requires three right-handed neutrinos (N i ), one of which, N 1, can be sufficiently stable to be dark matter. In the early universe, W R exchange with the Standard Model thermal bath keeps the right-handed neutrinos in ...
Jeff A. Dror +3 more
doaj +1 more source