Results 31 to 40 of about 701,414 (343)
Breakdown of Chiral Perturbation Theory for the Axion Hot Dark Matter Bound. [PDF]
Physical Review Letters, 2021 We show that the commonly adopted hot dark matter bound on the axion mass m_{a}≲1 eV is not reliable, since it is obtained by extrapolating the chiral expansion in a region where the effective field theory breaks down.
Luca Di Luzio, G. Martinelli, G. Piazza
semanticscholar +1 more source
Merger Effects on the Spin and Shape Alignments of Galaxy Stellar, Cold Gas, Hot Gas, and Dark Matter Components [PDF]
Astrophysical Journal, 2022 We present a numerical evidence supporting the scenario that the peculiar alignments of the galaxy stellar spins with the major principal axes of the local tidal tensors are produced during the quiescent evolution period when the galaxies experience no ...
Jounghun Lee, Jun-Sung Moon
semanticscholar +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 ...
S.E. Ennadifi
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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.
Robert Malaney +2 more
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Hot-dark matter, cold dark matter and accelerating universe [PDF]
, 2006 The Friedman equation is solved for a universe contains hotdark matter and cold dark matter. In this scenario, hot-dark matter drives an accelerating universe no cold dark matter.
Abbas Farmany +2 more
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Neutrinos as Hot or Warm Dark Matter [PDF]
, 2011 Both active and sterile sub-eV neutrinos can serve for hot dark matter (DM). On the other hand, keV sterile neutrinos could be a good candidate for warm DM. The beta-decaying (e.g., H-3 and Ru-106) and EC-decaying (e.g., Ho-163) nuclei are considered as the most promising targets to capture those extremely low energy neutrinos and antineutrinos ...
Y.F. Li, Zhi‐zhong Xing
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Cold + Hot Dark Matter After Super-Kamiokande [PDF]
, 1998 8 pages, Latex+blois.sty+psfig.sty, including 2 inlined postscript figures. To be published in the proceedings of the Xth Rencontres de Blois, "The Birth of Galaxies", 28 June - 4 July 1998. A computational error has been corrected, leading to substantial corrections to the figures but relatively minor corrections to the ...
Joel R. Primack, Michael Groß
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Dark matter and gravitational waves from a dark big bang [PDF]
Physical Review D, 2023 The Hot Big Bang is often considered as the origin of all matter and radiation in the Universe. Primordial nucleosynthesis (BBN) provides strong evidence that the early Universe contained a hot plasma of photons and baryons with a temperature $T>\text ...
K. Freese, M. W. Winkler
semanticscholar +1 more source
Primordial black hole sterile neutrinogenesis: sterile neutrino dark matter production independent of couplings [PDF]
Journal of Cosmology and Astroparticle Physics, 2023 Sterile neutrinos (ν s s) are well-motivated and actively searched for hypothetical neutral particles that would mix with the Standard Model active neutrinos. They are considered prime warm dark matter (DM) candidates, typically when their mass is in the
Muping Chen +3 more
semanticscholar +1 more source
Anisotropic cosmic optical background bound for decaying dark matter in light of the LORRI anomaly [PDF]
, 2022 Recently anomalous flux in the cosmic optical background (COB) is reported by the New Horizon observations. The COB flux is 16 . 37 ± 1 . 47 nWm − 2 sr − 1 , at the LORRI pivot wavelength of 0 . 608 µ m, which is ∼ 4 σ level above the expected flux from the
K. Nakayama, W. Yin
semanticscholar +1 more source