Star Models with Dark Energy

Abstract

We have constructed star models consisting of four parts: (i) a homogeneous inner core with anisotropic pressure (ii) an infinitesimal thin shell separating the core and the envelope; (iii) an envelope of inhomogeneous density and isotropic pressure; (iv) an infinitesimal thin shell matching the envelope boundary and the exterior Schwarzschild spacetime. We have analyzed all the energy conditions for the core, envelope and the two thin shells. We have found that, in order to have static solutions, at least one of the regions must be constituted by dark energy. The results show that there is no physical reason to have a superior limit for the mass of these objects but for the ratio of mass and radius.

arXiv comment20 pages, 1 figure, references and some comments added, typos corrected, in press GRG

References in corpus (62)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Dynamics of dark energy
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results
• Type Ia Supernova Discoveries at z>1 From the Hubble Space Telescope: Evidence for Past Deceleration and Constraints on Dark Energy Evolution
• Cosmological parameters from SDSS and WMAP
• Cosmological Imprint of an Energy Component with General Equation of State
• The Supernova Legacy Survey: Measurement of Omega_M, Omega_Lambda and w from the First Year Data Set
• Is Cosmic Speed-Up Due to New Gravitational Physics?
• Modified gravity with negative and positive powers of the curvature: unification of the inflation and of the cosmic acceleration
• Cosmological Tracking Solutions
• Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
• The Second Data Release of the Sloan Digital Sky Survey
• Supergravity description of field theories on curved manifolds and a no go theorem
• The First Data Release of the Sloan Digital Sky Survey
• Observational Constraints on the Nature of the Dark Energy: First Cosmological Results from the ESSENCE Supernova Survey
• Cosmology on a Brane in Minkowski Bulk
• Further Evidence for Cosmological Evolution of the Fine Structure Constant
• The 2dF Galaxy Redshift Survey: correlation functions, peculiar velocities and the matter density of the Universe
• The Third Data Release of the Sloan Digital Sky Survey
• The 2dF Galaxy Redshift Survey: The bias of galaxies and the density of the Universe
• Scrutinizing Exotic Cosmological Models Using ESSENCE Supernova Data Combined with Other Cosmological Probes
• The final state and thermodynamics of dark energy universe
• A classification of scalar field potentials with cosmological scaling solutions
• Structure formation with a self-tuning scalar field
• Stable gravastars - an alternative to black holes?
• Black hole mass decreasing due to phantom energy accretion
• Metastable Gravitons and Infinite Volume Extra Dimensions
• Gravastars must have anisotropic pressures
• Dark Energy and Gravity
• Stable dark energy stars
• How to tell a gravastar from a black hole
• Gravitational Condensate Stars: An Alternative to Black Holes
• On the spherical collapse model in dark energy cosmologies
• Accelerating Cosmologies from Compactification
• Accelerating Cosmologies from S-Branes
• The Mass Power Spectrum in Quintessence Cosmological Models
• A Study of Accelerating Cosmologies from Superstring/M theories
• Gravastars supported by nonlinear electrodynamics
• Hyperbolic Space Cosmologies
• Accelerating cosmologies from M/String theory compactifications
• Inflation from Superstring/M Theory Compactification with Higher Order Corrections I
• Where are all the gravastars? Limits upon the gravastar model from accreting black holes
• Accelerating Cosmologies and Inflation from M/Superstring Theories
• Gravastar energy conditions revisited
• Accelerating Cosmologies and a Phase Transition in M-Theory
• The Chaplygin dark star
• Stable and "bounded excursion" gravastars, and black holes in Einstein's theory of gravity
• Problems with Time-Varying Extra Dimensions or "Cardassian Expansion" as Alternatives to Dark Energy
• Cosmic Acceleration from M Theory on Twisted Spaces
• Black Hole Formation from Collapsing Dust Fluid in a Background of Dark Energy
• Transient Quintessence from Group Manifold Reductions or how all roads lead to Rome
• Bounded excursion stable gravastars and black holes
• Accelerating Universes from Compactification on a Warped Conifold
• Accelerating cosmologies from compactification with a twist
• Existence of black holes in Friedmann-Robertson-Walker universe dominated by dark energy
• Cosmological constant and late transient acceleration of the universe in the Horava-Witten Heterotic M-Theory on S^{1}/Z_{2}
• Acceleration from M theory and Fine-tuning
• Role of Modified Chaplygin Gas as a Dark Energy Model in Collapsing Spherically Symmetric Cloud
• Gravitational collapse due to dark matter and dark energy in the brane world scenario

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• Exact dark energy star solutions
• Gravastars with higher dimensional spacetimes
• Generic thin-shell gravastars
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• Stable Gravastars of Anisotropic Dark Energy
• Gravastars and Black Holes of Anisotropic Dark Energy
• Radial pulsations, moment of inertia and tidal deformability of dark energy stars
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• Charged strange star coupled to anisotropic dark energy in Tolman-Kuchowicz spacetime
• Radiating Gravastars
• Dark energy stars: Stable configurations
• Possible dark energy imprints in gravitational wave spectrum of mixed neutron-dark-energy stars
• Lorentz violation with an invariant minimum speed as foundation of the Gravitational Bose Einstein Condensate of a Dark Energy Star
• QED Energy-Momentum Trace as a Force in Astrophysics
• White dwarfs as a probe of dark energy
• Gravastars with Dark Energy Evolving to Naked Singularity
• Comment to ''On Anisotropic Dark Energy Stars''
• Gravastars with an Interior Dark Energy Fluid Forming a Naked Singularity
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• Spherically Symmetric Gravitational Collapse Of Inhomogeneous Dust Cloud In The Background Of Dark Energy