Results 31 to 40 of about 41,122 (294)
UNIFIED DARK MATTER IN SCALAR FIELD COSMOLOGIES [PDF]
Modern Physics Letters A, 2007 Considering the general Lagrangian of k-essence models, we study and classify them through variables connected to the fluid equation of state parameter wκ. This allows one to find solutions around which the scalar field describes a mixture of dark matter and cosmological constant-like dark energy, an example being the purely kinetic model proposed by ...
BERTACCA, DANIELE +2 more
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Can dark matter be a scalar field? [PDF]
Journal of Cosmology and Astroparticle Physics, 2016 In this paper we study a real scalar field as a possible candidate to explain the dark matter in the universe. In the context of a free scalar field with quadratic potential, we have used Union 2.1 SN Ia observational data jointly with a Planck prior over the dark matter density parameter to set a lower limit on the dark matter mass as $m\geq0.12H_0 ...
Jesus, J. F. +3 more
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Halos of unified dark matter scalar field [PDF]
Journal of Cosmology and Astroparticle Physics, 2008 We investigate the static and spherically symmetric solutions of Einstein's equations for a scalar field with non-canonical kinetic term, assumed to provide both the dark matter and dark energy components of the Universe. In particular, we give a prescription to obtain solutions (dark halos) whose rotation curve v_c(r) is in good agreement with ...
BERTACCA, DANIELE +2 more
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, 2021 In recent years, the scalar field dark matter (SFDM), also called ultralight bosonic dark matter, has received considerable attention due to the number of problems it might help to solve.
Jordi Solís-López +4 more
semanticscholar +1 more source
Parkes Pulsar Timing Array constraints on ultralight scalar-field dark matter [PDF]
Physical Review D, 2018 It is widely accepted that dark matter contributes about a quarter of the critical mass-energy density in our Universe. The nature of dark matter is currently unknown, with the mass of possible constituents spanning nearly one hundred orders of magnitude.
N. Porayko +29 more
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Scalar Field Dark Matter [PDF]
, 2005 11 pagez, 5 figures, REVTeX. To appear in proceedings of the ``Mexican Meeting on Exact Solutions and Scalar Fields in Gravity '', in honour of Heinz Dehnen's 65th Birthday and Dietrich Kramer's 60th Birthday. Mexico D.F., Mexico, in press. More info at http://www.fis.cinvestav.mx/~siddh/PHI/
Matos, T. +3 more
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Radiative interactions between new non-Abelian gauge sector and the standard model
Physics Letters B, 2021 We discuss one loop generation of the term connecting gauge fields from a local hidden SU(2)H and the standard model U(1)Y introducing an SU(2)H doublet fermion with non-zero hypercharge and a scalar field in adjoint representation.
Takaaki Nomura, Hiroshi Okada
doaj +1 more source
Scalar field dark matter spectator during inflation: the effect of self-interaction [PDF]
Journal of Cosmology and Astroparticle Physics, 2019 Nowadays cosmological inflation is the most accepted mechanism to explain the primordial seeds that led to the structure formation observed in the Universe.
Luis E. Padilla +3 more
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Scalar-field theory of dark matter [PDF]
International Journal of Modern Physics A, 2014 We develop a theory of dark matter based on a previously proposed picture, in which a complex vacuum scalar field makes the universe a superfluid, with the energy density of the superfluid giving rise to dark energy, and variations from vacuum density giving rise to dark matter. We formulate a nonlinear Klein–Gordon equation to describe the superfluid,
Huang, Kerson, Xiong, Chi, Zhao, Xiaofei
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Scalar field dark matter: helping or hurting small-scale problems in cosmology? [PDF]
Monthly notices of the Royal Astronomical Society, 2018 Building upon results of cosmological simulations of ultra-light scalar field dark matter (SFDM), we present a comprehensive model for the density profiles of SFDM haloes as a function of halo virial mass $M_{\rm h}$ and scalar field mass $m$.
V. Robles, J. Bullock, M. Boylan-Kolchin
semanticscholar +1 more source