منابع مشابه
A Fluid of Strings as a Viable Candidate to the Dark Side of the Universe
We investigate the possibility that part of the dark matter is not made out of the usual cold dark matter (CDM) dustlike particles, but is under the form of a fluid of strings with barotropic factor ws = −1/3 of cosmic origin. To this aim, we split the dark matter density parameter in two terms and investigate the dynamics of a spatially flat universe filled with baryons, CDM, fluid of strings ...
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A new model of the observed universe, using solutions to the full Einstein equations, is developed from the hypothesis that our observable universe is an underdense bubble, with an internally inhomogeneous fractal bubble distribution of bound matter systems, in a spatially flat bulk universe. It is argued on the basis of primordial inflation and resulting structure formation, that the clocks of...
متن کاملConstraining the dark fluid
Cosmological observations are normally fit under the assumption that the dark sector can be decomposed into dark matter and dark energy components. However, as long as the probes remain purely gravitational, there is no unique decomposition and observations can only constrain a single dark fluid; this is known as the dark degeneracy. We use observations to directly constrain this dark fluid in ...
متن کاملFluid Dark Matter.
Dark matter modeled as a classical scalar field that interacts only with gravity and with itself by a potential that is close to quartic at large field values and approaches a quadratic form when the field is small would be gravitationally produced by inflation and, at the present epoch, could act like an ideal fluid with pressure that is a function only of the mass density. This could have obs...
متن کاملA fluid mechanical explanation of dark matter
Matter in the universe has become “dark” or “missing” through misconceptions about the fluid mechanics of gravitational structure formation. The linear Jeans (1902, 1929) theory gives vast overestimates (by factors of trillions or more) for the initial condensation mass of baryonic matter, and vast underestimates (by factors of trillions or more) for the initial condensation mass of the non-bar...
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ژورنال
عنوان ژورنال: Astrophysics and Space Science
سال: 2017
ISSN: 0004-640X,1572-946X
DOI: 10.1007/s10509-017-3221-x