Zobrazeno 1 - 10
of 65
pro vyhledávání: '"Vishwakarma, R. G."'
This paper calculates the expected gravitational wave background (GWB) in the quasi-steady state cosmology (QSSC). The principal sources of gravitational waves in the QSSC are the minicreation events (MCE). With suitable assumptions the GWB can be co
Externí odkaz:
http://arxiv.org/abs/1505.05494
Autor:
Vishwakarma, R. G.
Publikováno v:
Gen.Rel.Grav.37:1305-1311,2005
Models with varying cosmical parameters, which were earlier regarded constant, are getting attention. However, different models are usually invoked to explain the evolution of different parameters. We argue that whatever physical process is responsib
Externí odkaz:
http://arxiv.org/abs/0801.2973
Publikováno v:
J.Astrophys.Astron.28:67-99,2007
In this paper we discuss the properties of the quasi-steady state cosmological model (QSSC) developed in 1993 in its role as a cyclic model of the universe driven by a negative energy scalar field. We discuss the origin of such a scalar field in the
Externí odkaz:
http://arxiv.org/abs/0801.2965
Autor:
Vishwakarma, R. G., Narlikar, J. V.
Publikováno v:
J.Astrophys.Astron.28:17-27,2007
There is a growing interest in the cosmologists for theories with negative energy scalar fields and creation, in order to model a repulsive gravity. The classical steady state cosmology proposed by Bondi, Gold and Hoyle in 1948, was the first such th
Externí odkaz:
http://arxiv.org/abs/0705.0544
Autor:
Vishwakarma, R. G.
A recent paper by Ahluwalia-Khalilova (astro-ph/0601489) is examined where he claims that the standard FRW cosmology with a $\Lambda$ predicts existence of dark matter without invoking the data on galactic rotation curves and gravitational lensing. H
Externí odkaz:
http://arxiv.org/abs/astro-ph/0603213
Autor:
Vishwakarma, R. G.
Publikováno v:
Mon.Not.Roy.Astron.Soc.361:1382-1386,2005
Consistency of Einstein-de Sitter model with the recently observed SNe Ia by the Hubble Space Telescope is examined. The model shows a reasonable fit to the observation, if one takes into account the extinction of SNe light by the intergalactic metal
Externí odkaz:
http://arxiv.org/abs/astro-ph/0506217
Autor:
Vishwakarma, R. G., Narlikar, J. V.
Publikováno v:
Int.J.Mod.Phys.D14:345-354,2005
We examine the possible consistency of the quasi-steady state model with the newly discovered SNe Ia. The model assumes the existence of metallic dust ejected from the SNe explosions, which extinguishes light travelling over long distances. We find t
Externí odkaz:
http://arxiv.org/abs/astro-ph/0412048
Autor:
Vishwakarma, R. G.
Publikováno v:
SpacetimeandSubstance7:53-56,2006
While many observations support the validity of Einstein's general relativity as the theory of gravity, there are yet many that suggest the presence of new physics. In order to explain the high-redshift supernovae Ia observations together with the re
Externí odkaz:
http://arxiv.org/abs/astro-ph/0404371
Autor:
Vishwakarma, R. G.
Publikováno v:
Mon.Not.Roy.Astron.Soc. 345 (2003) 545
The current observations are usually explained by an accelerating expansion of the present universe. However, with the present quality of the supernovae Ia data, the allowed parameter space is wide enough to accommodate the decelerating models as wel
Externí odkaz:
http://arxiv.org/abs/astro-ph/0302357
Autor:
Vishwakarma, R. G., Singh, Parampreet
Publikováno v:
Class.Quant.Grav. 20 (2003) 2033-2044
A plethora of models of the universe have been proposed in recent years claiming that the present universe is accelerating, being driven by some hypothetical source with negative pressure collectively known as {\it dark energy} which though do not ap
Externí odkaz:
http://arxiv.org/abs/astro-ph/0211285