Results 31 to 40 of about 428,876 (333)
A new recipe for $$\Lambda $$ Λ CDM
European Physical Journal C: Particles and Fields, 2017 It is well known that a canonical scalar field is able to describe either dark matter or dark energy but not both. We demonstrate that a non-canonical scalar field can describe both dark matter and dark energy within a unified setting.
Varun Sahni, Anjan A. Sen
doaj +1 more source
Superconducting Detectors for Super Light Dark Matter [PDF]
, 2015 We propose and study a new class of superconducting detectors which are sensitive to O(meV) electron recoils from dark matter-electron scattering. Such devices could detect dark matter as light as the warm dark matter limit, mX > keV. We compute the rate
Hochberg, Yonit +2 more
core +3 more sources
Self-interacting warm dark matter
Physical Review D, 2000 It has been shown by many independent studies that the cold dark matter scenario produces singular galactic dark halos, in strong contrast with observations. Possible remedies are that either the dark matter is warm so that it has significant thermal motion or that the dark matter has strong self interactions.
Hannestad, Steen, Scherrer, Robert J.
openaire +2 more sources
Matter power spectrum of light freeze-in dark matter: With or without self-interaction
Physics Letters B, 2020 We study the free-streaming effect in a light freeze-in dark matter model. Naturally in the dark sector one can find dark matter related coupling, and such coupling may induce dark matter self-scattering.
Ran Huo
doaj +1 more source
Gravitino warm dark matter with entropy production [PDF]
Journal of High Energy Physics, 2003 Gravitinos with a mass in the keV range are an interesting candidate for warm dark matter. Recent measurements of the matter density of the universe and of cosmic structures at the dwarf galaxy scale rule out the simplest gravitino models with thermal freeze-out.
Baltz, Edward A., Murayama, Hitoshi
openaire +2 more sources
The dynamics of subhaloes in warm dark matter models [PDF]
Monthly Notices of the Royal Astronomical Society, 2008 10 pages, 11 figures, accepted for publication in ...
Knebe, Alexander +3 more
openaire +3 more sources
Non-Cold Dark Matter from Primordial Black Hole Evaporation
, 2020 Dark matter coupled solely gravitationally can be produced through the decay of primordial black holes in the early universe. If the dark matter is lighter than the initial black hole temperature, it could be warm enough to be subject to structure ...
Baldes, Iason +3 more
core +1 more source
Unifying dark matter and dark energy with non-canonical scalars
European Physical Journal C: Particles and Fields, 2021 Non-canonical scalar fields with the Lagrangian $${{\mathcal {L}}} = X^\alpha - V(\phi )$$ L = X α - V ( ϕ ) , possess the attractive property that the speed of sound, $$c_s^{2} = (2\,\alpha - 1)^{-1}$$ c s 2 = ( 2 α - 1 ) - 1 , can be exceedingly small ...
Swagat S. Mishra, Varun Sahni
doaj +1 more source
Lyman-alpha constraints on warm and on warm-plus-cold dark matter models [PDF]
, 2008 We revisit Lyman-alpha bounds on the dark matter mass in Lambda Warm Dark Matter (Lambda-WDM) models, and derive new bounds in the case of mixed Cold plus Warm models (Lambda-CWDM), using a set up which is a good approximation for several theoretically ...
Boyarsky, Alexey +3 more
core +3 more sources
Cutoff in the Lyman-α forest power spectrum: Warm IGM or warm dark matter?
Physics Letters B, 2017 We re-analyse high redshift and high resolution Lyman-α forest spectra considered in [1], seeking to constrain the properties of warm dark matter particles.
Antonella Garzilli +2 more
doaj +1 more source