Results 21 to 30 of about 110,473 (324)
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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Newtonian collapse of scalar field dark matter [PDF]
Physical Review D, 2003 In this letter, we develop a Newtonian approach to the collapse of galaxy fluctuations of scalar field dark matter under initial conditions inferred from simple assumptions. The full relativistic system, the so called Einstein-Klein-Gordon, is reduced to the Schr dinger-Newton one in the weak field limit. The scaling symmetries of the SN equations are
Guzman, F., Urena-Lopez, L.
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Scalar fields as dark matter in spiral galaxies [PDF]
Classical and Quantum Gravity, 1999 5 pages, RevTeX, eight eps figures.
Guzmán, F. Siddhartha, Matos, Tonatiuh
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Supplying dark energy from scalar field dark matter [PDF]
International Journal of Modern Physics D, 2018 We consider the hypothesis that dark matter (DM) and dark energy (DE) consist of ultra-light self-interacting scalar particles. It is found that the Klein–Gordon equation with only two free parameters (mass and self-coupling) on a Schwarzschild background, at the galactic length-scales has the solution which corresponds to Bose–Einstein Condensate ...
Merab Gogberashvili, Alexander Sakharov
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How the Scalar Field of Unified Dark Matter Models Can Cluster [PDF]
, 2008 We use scalar-field Lagrangians with a non-canonical kinetic term to obtain unified dark matter models where both the dark matter and the dark energy, the latter mimicking a cosmological constant, are described by the scalar field itself.
Bartolo, Nicola +3 more
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Nonrelativistic approach for cosmological scalar field dark matter [PDF]
Physical Review D, 2014 RevTex file, 5 pages, no figures.
L. Arturo Ureña–López
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Is Dark Matter a BEC or Scalar Field? [PDF]
Journal of the Korean Physical Society, 2009 This is a brief review on the history of the Bose-Einstein condensate (BEC) or boson star model of galactic dark matter halos, where ultra-light scalar dark matter particles condense in a single BEC quantum state. The halos can be described as a self-gravitating, possibly self-interacting, coherent scalar field.
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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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Scalar field dark matter with spontaneous symmetry breaking and the 3.5 keV line
Physics Letters B, 2018 We show that the present dark matter abundance can be accounted for by an oscillating scalar field that acquires both mass and a non-zero expectation value from interactions with the Higgs field.
Catarina Cosme +2 more
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Universe, 2020 The generalized hybrid metric-Palatini theory of gravity admits a scalar-tensor representation in terms of two interacting scalar fields. We show that, upon an appropriate choice of the interaction potential, one of the scalar fields behaves like dark ...
Paulo M. Sá
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