Cosmological Evolution with Negative Energy Densities

For general number of spatial dimensions we investigate the cosmological dynamics driven by a cosmological constant and by a source with barotropic equation of state. It is assumed that for both those sources the energy density can be either positive or negative. Exact solutions of the cosmological...

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Bibliographic Details
Published in:Astrophysics 2022-09, Vol.65 (3), p.427-440
Main Authors: Saharian, A. A., Avagyan, R. M., de Mello, E. R. Bezerra, Kotanjyan, V. Kh, Petrosyan, T. A., Babujyan, H. G.
Format: Article
Language:English
Subjects:
Analysis
Astronomical models
Astronomy
Astrophysics
Astrophysics and Astroparticles
Astrophysics and Cosmology
Cosmological constant
Equations of state
Evolution
Exact solutions
Hypergeometric functions
Negative matter
Observations and Techniques
Parameters
Physics
Physics and Astronomy
Radiation, Background
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
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Summary:For general number of spatial dimensions we investigate the cosmological dynamics driven by a cosmological constant and by a source with barotropic equation of state. It is assumed that for both those sources the energy density can be either positive or negative. Exact solutions of the cosmological equations are provided for flat models. For models with curved space and with zero cosmological constant the general solutions are expressed in terms of the hypergeometric function. The qualitative evolution is described for all values of the equation of state parameter. We specify the values of that parameter and the combinations of the signs for the cosmological constant and matter energy density for which the cosmological dynamics is nonsingular. An example is considered with positive cosmological constant and negative matter energy density induced by the polarization of the hyperbolic vacuum.
ISSN:0571-7256
1573-8191
DOI:10.1007/s10511-022-09751-1