Zobrazeno 1 - 10
of 52
pro vyhledávání: '"Yurov, Artyom V."'
Publikováno v:
Eur. Phys. J. C (2018) 78: 542
The article is dedicated to one of the most undeservedly overlooked properties of the cosmological models: the behaviour at, near and due to a jump discontinuity. It is most interesting that while the usual considerations of the cosmological dynamics
Externí odkaz:
http://arxiv.org/abs/1710.05796
We develop a method for constructing exact cosmological solutions in brane world cosmology. New classes of cosmological solutions on Randall-Sandrum brane are obtained. The superpotential and Hubble parameter are represented in quadratures. These sol
Externí odkaz:
http://arxiv.org/abs/1311.6798
We consider the well-known Boltzmann brains problem in frames of simple phantom energy models with little rip and big rip singularity. It is showed that these models (i) satisfy to observational data and (ii) may be free from Boltzmann brains problem
Externí odkaz:
http://arxiv.org/abs/1309.1969
Publikováno v:
Grav.Cosmol. 20 (2014) no.2, 106-115 (2014)
In this paper we revisit the relationship between the Einstein--Friedman and the Abel equations to demonstrate how it might be applied to the inflationary analysis in a flat Friedman universe filled with a real-valued scalar field. The analysis is pe
Externí odkaz:
http://arxiv.org/abs/1302.6017
It is observed that one of Einstein-Friedmann's equations has formally the aspect of a Sturm-Liouville problem, and that the cosmological constant, $\Lambda$, plays thereby the role of spectral parameter (what hints to its connection with the Casimir
Externí odkaz:
http://arxiv.org/abs/1212.4268
Publikováno v:
Astrophysics and Space Science 342, 1 (2012)
Of all the possible ways to describe the behavior of the universe that has undergone a big trip the Wheeler-DeWitt equation should be the most accurate -- provided, of course, that we employ the correct formulation. In this article we start by discus
Externí odkaz:
http://arxiv.org/abs/1208.3828
Brane dark energy cosmologies, leading to various possible evolutions of our universe, are investigated. The discussion shows that while all these models can be made arbitrarily close to the standard $\Lambda$CDM cosmology at present, their future ev
Externí odkaz:
http://arxiv.org/abs/1206.2192
We construct phantom energy models with the equation-of-state parameter $w$ such that $w<-1$, but finite-time future singularity does not occur. Such models can be divided into two classes: (i) energy density increases with time ("phantom energy" wit
Externí odkaz:
http://arxiv.org/abs/1201.4056
Publikováno v:
Eur.Phys. J. C (2011) 71:1740
An anthropic principle has made it possible to answer the difficult question of why the observable value of cosmological constant ($\Lambda\sim 10^{-47}$ GeV${}^4$) is so disconcertingly tiny compared to predicted value of vacuum energy density $\rho
Externí odkaz:
http://arxiv.org/abs/1102.0320
Autor:
Yurov, Artyom V., Yurov, Valerian A.
Publikováno v:
The Problems of Modern Cosmology: a volume in honour of Prof. S.D. Odintsov. ISBN 978-5-89428-313-5. Tomsk State Pedag. Univ. Press, 345-354 (2009)
This article is dedicated to cosmologies with variable speed of light (VSL) - models, which one can consider as a particular case of models of a modified gravitation. In quantum cosmology the closed universe can spontaneously nucleate out of the stat
Externí odkaz:
http://arxiv.org/abs/0812.4738