Results 41 to 50 of about 164,168 (293)
Too hot to handle? Analytic solutions for massive neutrino or warm dark matter cosmologies [PDF]
, 2017 Author(s): Slepian, Z; Portillo, SKN | Abstract: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. We obtain novel closed-form solutions to the Friedmann equation for cosmological models containing a ...
Z. Slepian, S. Portillo
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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.
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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
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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
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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
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Sterile neutrino hot, warm, and cold dark matter [PDF]
Physical Review D, 2001 We calculate the incoherent resonant and non-resonant scattering production of sterile neutrinos in the early universe. We find ranges of sterile neutrino masses, vacuum mixing angles, and initial lepton numbers which allow these species to constitute viable hot, warm, and cold dark matter (HDM, WDM, CDM) candidates which meet observational constraints.
Abazajian, Kevork +2 more
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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
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The alignment and shape of dark matter, stellar, and hot gas distributions in the EAGLE and cosmo-OWLS simulations [PDF]
, 2015 We report the alignment and shape of dark matter, stellar, and hot gas distributions in the EAGLE (Evolution and Assembly of GaLaxies and their Environments) and cosmo-OWLS(Over- Whelmingly Large Simulations) simulations.
Marco Velliscig +11 more
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Cannibalism hinders growth: Cannibal Dark Matter and the S8 tension [PDF]
Journal of Cosmology and Astroparticle Physics, 2020 Many models of dark matter have been proposed in attempt to ease the S8 tension between weak lensing and CMB experiments. One such exciting possibility is cannibalistic dark matter (CanDM), which has exothermal number-changing interactions allowing it to
Stefan Heimersheim +3 more
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