Generalized ideal-fluid Lagrangian and nonsingular cosmological model of space-time

1978 ◽  
Vol 21 (9) ◽  
pp. 1221-1223
Author(s):  
V. N. Tunyak
Keyword(s):  
Cosmological Model ◽  
Ideal Fluid ◽  
Space Time ◽  
Nonsingular Cosmological Model

scholarly journals A nonsingular cosmological model with shear and rotation

2011 ◽  
Vol 17 (4) ◽  
pp. 344-348
Author(s):  
G. K. Goswami ◽  
Mandwi Trivedi
Keyword(s):  
Cosmological Model ◽  
Nonsingular Cosmological Model

UNUSUAL HYDRODYNAMICS

1987 ◽  
Vol 02 (05) ◽  
pp. 1591-1615 ◽  
Author(s):  
V.A. BEREZIN
Keyword(s):  
Black Hole ◽  
Cosmological Model ◽  
Production Process ◽  
Particle Production ◽  
Energy Momentum Tensor ◽  
Equations Of Motion ◽  
Momentum Tensor ◽  
Point Of View ◽  
Modified Equations ◽  
Nonsingular Cosmological Model

A method for the phenomenological description of particle production is proposed. Correspondingly modified equations of motion and energy-momentum tensor are obtained. In order to illustrate this method we reconsider from the new point of view of (i) the C-field Hoyle-Narlikar cosmology, (ii) the influence of the particle production process on metric inside the event horizon of a charged black hole and (iii) a nonsingular cosmological model.

A multi-element cosmological model with a complex space-time topology

2015 ◽  
Vol 59 (2) ◽  
pp. 89-99 ◽  
Author(s):  
N. S. Kardashev ◽  
L. N. Lipatova ◽  
I. D. Novikov ◽  
A. A. Shatskiy
Keyword(s):  
Cosmological Model ◽  
Complex Space ◽  
Space Time

scholarly journals Cosmological model favored by the holographic principle

2016 ◽  
Vol 41 ◽  
pp. 1660127
Author(s):  
Irina Dymnikova ◽  
Anna Dobosz ◽  
Bożena Sołtysek
Keyword(s):  
Cosmological Model ◽  
Cosmological Constant ◽  
Space Time ◽  
Holographic Principle ◽  
Einstein Equations ◽  
Energy Tensor ◽  
De Sitter ◽  
Quantum Evaporation ◽  
Stress Energy ◽  
De Sitter Vacua

We present a regular spherically symmetric cosmological model of the Lemaitre class distinguished by the holographic principle as the thermodynamically stable end-point of quantum evaporation of the cosmological horizon. A source term in the Einstein equations connects smoothly two de Sitter vacua with different values of cosmological constant and corresponds to anisotropic vacuum dark fluid defined by symmetry of its stress-energy tensor which is invariant under the radial boosts. Global structure of space-time is the same as for the de Sitter space-time. Cosmological evolution goes from a big initial value of the cosmological constant towards its presently observed value.

scholarly journals SHORTCUTS IN PARTICLE PRODUCTION IN A TOROIDALLY COMPACTIFIED SPACE–TIME

2007 ◽  
Vol 16 (11) ◽  
pp. 1853-1861 ◽  
Author(s):  
J. M. HOFF DA SILVA ◽  
R. DA ROCHA
Keyword(s):  
Cosmological Model ◽  
Cosmic String ◽  
Extra Dimensions ◽  
Particle Production ◽  
Space Time ◽  
Physical Consequences ◽  
Compactified Space ◽  
Topological Transformations

We investigate the particle production in a toroidally compactified space–time due to the expansion of a Friedmann cosmological model in ℝ3 × S1 outside a U(1) local cosmic string. The case of a Friedmann space–time is also investigated where torsion is incorporated in the connection. We present a generalization to toroidal compactification of p extra dimensions, where the topology is given by ℝ3 × Tp. Some implications are presented and discussed. Besides the dynamics of space–time, we investigate in detail the physical consequences of the topological transformations.

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