Regular homogeneous T-models with vacuum dark fluid

Abstract

We present the class of regular homogeneous T-models with vacuum dark fluid, associated with a variable cosmological term. The vacuum fluid is defined by the symmetry of its stress-energy tensor, i.e., its invariance under Lorentz boosts in a distinguished spatial direction (p_j=-ρ), which makes this fluid essentially anisotropic and allows its density to evolve. Typical features of homogeneous regular T-models are: the existence of a Killing horizon; beginning of the cosmological evolution from a null bang at the horizon; the existence of a regular static pre-bang region visible to cosmological observers; creation of matter from anisotropic vacuum, accompanied by very rapid isotropization. We study in detail the spherically symmetric regular T-models on the basis of a general exact solution for a mixture of the vacuum fluid and dustlike matter and apply it to give numerical estimates for a particular model which illustrates the ability of cosmological T-models to satisfy the observational constraints.

13 pages, no figures, Latex

References in corpus (25)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Dynamics of dark energy
• Cosmological Results from High-z Supernovae
• The Cosmic Triangle: Revealing the State of the Universe
• BVRI Light Curves for 22 Type Ia Supernovae
• Evolution of the Scale Factor with a Variable Cosmological Term
• Cosmic Concordance and Quintessence
• Regular electrically charged structures in Nonlinear Electrodynamics coupled to General Relativity
• The Cosmological Constant is Back
• Cosmological term as a source of mass
• The foundations of observing dark energy dynamics with the Wilkinson Microwave Anisotropy Probe
• Probing the dark side: Constraints on the dark energy equation of state from CMB, large scale structure and Type Ia supernovae
• The algebraic structure of a cosmological term in spherically symmetric solutions
• On a general class of brane-world black holes
• Constraining the quintessence equation of state with SnIa data and CMB peaks
• Stability of a vacuum nonsingular black hole
• Spherically symmetric false vacuum: no-go theorems and global structure
• Structure and stability of cold scalar-tensor black holes
• Spinning superconducting electrovacuum soliton
• Nonsingular vacuum cosmologies with a variable cosmological term
• Universes inside a $\Lambda$ black hole
• The T-domain and extreme matter phases inside spherically symmetric black holes
• Dust-filled axially symmetric universes with a cosmological constant
• Gauge-noninvariance of quantum cosmology and vacuum dark energy

Cited by in corpus (17)

• Regular black holes: Electrically charged solutions, Reissner-Nordström outside a de Sitter core
• Magnetic black universes and wormholes with a phantom scalar
• Regular black hole remnants and graviatoms with de Sitter interior as heavy dark matter candidates probing inhomogeneity of early universe
• Regular black holes in $f(R)$ gravity coupled to nonlinear electrodynamics
• Gaussian black holes in Rastall Gravity
• Multi-horizon spherically symmetric spacetimes with several scales of vacuum energy
• Horizons vs. singularities in spherically symmetric space-times
• Black holes can have curly hair
• Five dimensional rotating regular black holes and shadow
• Planckian charged black holes in ultraviolet self-complete quantum gravity
• Regular black holes with flux tube core
• Remarks on regular black holes
• Matter sources for a Null Big Bang
• New regular black hole solutions and other electrically charged compact objects with a de Sitter core and a matter layer
• Stability of regular black holes and other compact objects with a charged de Sitter core and a surface matter layer
• Possible black universes in a brane world
• Horizons in matter: black hole hair vs. Null Big Bang