Results 31 to 40 of about 738,678 (282)
Physics Letters B, 2007 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Dymnikova, Irina, Galaktionov, Evgeny
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Physics Letters B, 2019 The paper brings a novel approach to unification of dark matter and dark energy in terms of a cosmic fluid. A model is introduced in which the cosmic fluid speed of sound squared is defined as a function of its equation of state (EoS) parameter.
Dalibor Perković, Hrvoje Štefančić
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Kerr–Newman-AdS black hole surrounded by perfect fluid matter in Rastall gravity
European Physical Journal C: Particles and Fields, 2018 The Rastall gravity is the modified Einstein general relativity, in which the energy-momentum conservation law is generalized to $$T^{\mu \nu }_{~~;\mu }=\lambda R^{,\nu }$$ T;μμν=λR,ν .
Zhaoyi Xu +3 more
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Dark energy coupled with dark matter in viscous fluid cosmology [PDF]
Astrophysics and Space Science, 2014 6 pages, no figures; to appear in Astrophys.
Brevik, I. +2 more
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European Physical Journal C: Particles and Fields, 2020 In this paper, we study the thermodynamic features of a rotating black hole surrounded by perfect fluid dark matter. We analyze the critical behavior of the black hole by considering the known relationship between pressure and cosmological constant.
Seyed Hossein Hendi +3 more
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Dissipative unified dark fluid model [PDF]
International Journal of Modern Physics D, 2019 We consider a unified barotropic dark fluid model with dissipation. Our fluid asymptotes between two power laws and so can interpolate between the dust and dark energy (DE) equations-of-state at early and late times. The dissipative part is a bulk viscous part with constant viscosity coefficient. The model is analyzed using the phase-space methodology
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Dark energy and dark matter from an additional adiabatic fluid [PDF]
Physical Review D, 2016 The Dark Sector is described by an additional barotropic fluid which evolves adiabatically during the universe's history and whose adiabatic exponent $ $ is derived from the standard definitions of specific heats. Although in general $ $ is a function of the redshift, the Hubble parameter and its derivatives, we find that our assumptions lead ...
Dunsby, Peter K. S. +2 more
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Non-adiabatic dark fluid cosmology [PDF]
Journal of Cosmology and Astroparticle Physics, 2009 We model the dark sector of the cosmic substratum by a viscous fluid with an equation of state $p=- $, where $ $ is the fluid-expansion scalar and $ $ is the coefficient of bulk viscosity for which we assume a dependence $ \propto ^ $ on the energy density $ $.
Hipolito-Ricaldi, W.S. +2 more
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European Physical Journal C: Particles and Fields, 2021 In this paper, we test the weak cosmic censorship conjecture (WCCC) for the Reissner–Nordström–de Sitter (RN-dS) black hole surrounded by perfect fluid dark matter.
Sanjar Shaymatov +2 more
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Perfect fluid dark matter model revisited
Proceedings of Tomsk State University of Control Systems and Radioelectronics, 2016 We revisit certain features of an assumed spherically symmetric perfect fluid dark matter halo in the light of the observed data of our galaxy, the Milky Way (MW). The idea is to apply the Faber-Visser approach of combined observations of rotation curves and lensing to a first post-Newtonian approximation to «measure» the equation of state ω( r ) of ...
POTAPOV ALEXANDR ANATOL'EVICH +2 more
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