Tolman-Oppenheimer-Volkoff equations in the presence of the Chaplygin gas: Stars and wormholelike solutions

@article{Gorini2008TolmanOppenheimerVolkoffEI,
  title={Tolman-Oppenheimer-Volkoff equations in the presence of the Chaplygin gas: Stars and wormholelike solutions},
  author={Vittorio Gorini and Alexander Yu Kamenshchik and Ugo Moschella and Vincent Pasquier and Alexei A. Starobinsky},
  journal={Physical Review D},
  year={2008},
  volume={78},
  pages={064064}
}
We study static solutions of the Tolman-Oppenheimer-Volkoff equations for spherically symmetric objects (stars) living in a space filled with the Chaplygin gas. Two cases are considered. In the normal case, all solutions (excluding the de Sitter one) realize a three-dimensional spheroidal geometry because the radial coordinate achieves a maximal value (the 'equator'). After crossing the equator, three scenarios are possible: a closed spheroid having a Schwarzschild-type singularity with… Expand
More about the Tolman-Oppenheimer-Volkoff equations for the generalized Chaplygin gas
We investigate the Tolman-Oppenheimer-Volkoff equations for the generalized Chaplygin gas with the aim of extending the findings of V. Gorini, U. Moschella, A. Y. Kamenshchik, V. Pasquier, and A. A.Expand
Spherically symmetric inhomogeneous model with Chaplygin gas
We investigate the late time acceleration with a Chaplygin type of gas in spherically symmetric inhomogeneous model. At the early phase we get Einstien-de Sitter type of solution generalised toExpand
Phase space of static wormholes sustained by an isotropic perfect fluid
A phase space is built that allows to study, classify and compare easily large classes of static spherically symmetric wormholes solutions, sustained by an isotropic perfect fluid in GeneralExpand
The Osgood Criterion and Finite-Time Cosmological Singularities
In this paper, we apply Osgood's criterion from the theory of ordinary differential equations to detect finite-time singularities in a spatially flat FLRW universe in the context of a perfect fluid,Expand
Notes on wormhole existence in scalar-tensor and F(R) gravity
Some recent papers have claimed the existence of static, spherically symmetric wormhole solutions to gravitational field equations in the absence of ghost (or phantom) degrees of freedom. We showExpand
The Chaplygin Gas Equation of State for the Quantized Free Scalar Field on Cosmological Spacetimes
In this paper, we try to answer the question whether the quantized free scalar field on a spatially flat Friedmann–Robertson–Walker (FRW) spacetime is a matter model that can induce a Chaplygin gasExpand
Thin-shell wormholes from the regular Hayward black hole
We revisit the regular black hole found by Hayward in $$4$$4-dimensional static, spherically symmetric spacetime. To find a possible source for such a spacetime we resort to the nonlinearExpand
Universe Described by Variable Modified Chaplygin Gas with Statefinder Diagnostic in General Relativity
The universe filled with variable modified Chaplygin gas having the equation of state p=Aρ−B/ρα, where 0≤α≤1, A is a positive constant and B is a positive function of the average scale factor a(t) ofExpand
Charged anisotropic matter with linear or nonlinear equation of state
Ivanov pointed out substantial analytical difficulties associated with self-gravitating, static, isotropic fluid spheres when pressure explicitly depends on matter density. Simplifications achievedExpand
Strange star admitting Chaplygin equation of state in Finch–Skea spacetime
In the present paper we propose a new model of an anisotropic strange star which admits the Chaplygin equation of state. The exterior spacetime is described by a Schwarzschild line element. The modelExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 46 REFERENCES
Gravitationally Collapsing Shells in (2+1) Dimensions
We study gravitationally collapsing models of pressureless dust, fluids with pressure, and the generalized Chaplygin gas (GCG) shell in (2+1)-dimensional spacetimes. Various collapse scenarios areExpand
Analysis of the cosmological Oppenheimer-Volkoff equations
We formulate the Oppenheimer–Volkoff equations with nonzero cosmological constant, Λ. We analyze the behavior of solutions (under mild assumptions on the equation of state). We prove that solutionsExpand
Wormholes in spacetime and their use for interstellar travel: A tool for teaching general relativity
Rapid interstellar travel by means of spacetime wormholes is described in a way that is useful for teaching elementary general relativity. The description touches base with Carl Sagan’s novelExpand
Stability properties of some perfect fluid cosmological models
Flat Friedmann-Robertson-Walker (FRW) perfect fluid cosmologies can be reproduced as particular solutions of suitable field-theoretical models. Here we investigate the stability of perfect fluidExpand
Tachyons, scalar fields, and cosmology
We study the role that tachyon fields may play in cosmology as compared to the well-established use of minimally coupled scalar fields. We first elaborate on a kind of correspondence existing betweenExpand
Regular phantom black holes.
TLDR
It looks possible that the Universe has originated in a phantom-dominated collapse in another universe, with KS expansion and isotropization after crossing the horizon, and possible generalizations include k-essence type scalar fields (with a potential) and scalar-tensor gravity. Expand
Stability of Chaplygin gas thin-shell wormholes
In this paper we construct spherical thin-shell wormholes supported by a Chaplygin gas. For a rather general class of geometries we introduce a new approach for the stability analysis of staticExpand
Letter: Density Perturbations in a Universe Dominated by the Chaplygin Gas
We study the fate of density perturbations in a Universe dominate by the Chaplygin gas, which exhibit negative pressure. In opposition to other models of perfect fluid with negative pressure, thereExpand
No realistic wormholes from ghost-free scalar-tensor phantom dark energy
It is proven that no wormholes can be formed in viable scalar-tensor models of dark energy admitting its phantom-like (w < −1) behavior in cosmology, even in the presence of electric or magneticExpand
CAN THE CHAPLYGIN GAS BE A PLAUSIBLE MODEL FOR DARK ENERGY
In this note two cosmological models representing the flat Friedmann Universe filled with a Chaplygin fluid, with or without dust, are analyzed in terms of the recently proposed "statefinder"Expand
...
1
2
3
4
5
...