Zobrazeno 1 - 10
of 152
pro vyhledávání: '"Jhingan S"'
Publikováno v:
MNRAS, 2015, 450, 3840
We study the temporal and energy spectral characteristics of the persistent black hole X-ray binary LMC X-1 using two XMM-Newton and a Suzaku observation. We report the discovery of low frequency (~ 26-29 mHz) quasi-periodic oscillations (QPOs). We a
Externí odkaz:
http://arxiv.org/abs/1410.0135
Publikováno v:
J. Phys.: Conf. Ser. 484, 012035 (2014)
We study the validity of cosmic distance duality relation between angular diameter and luminosity distances. To test this duality relation we use the latest Union2 Supernovae Type Ia (SNe Ia) data for estimating the luminosity distance. The estimatio
Externí odkaz:
http://arxiv.org/abs/1403.2070
Publikováno v:
Phys.Rev.D84:024001,2011
A distinguishable and observable physical property of Naked Singular Regions of the spacetime formed during a gravitational collapse has important implications for both experimental and theoretical relativity. We examine here whether energy can escap
Externí odkaz:
http://arxiv.org/abs/1004.3035
Autor:
Jhingan, S., Ghosh, Sushant G.
Publikováno v:
Physical Review D 81, 024010 (2010)
We consider a Lemaitre - Tolman - Bondi type space-time in Einstein gravity with the Gauss-Bonnet combination of quadratic curvature terms, and present exact solution in closed form. It turns out that the presence of the coupling constant of the Gaus
Externí odkaz:
http://arxiv.org/abs/1002.3245
Publikováno v:
Phys.Rev.D80:043523,2009
The $f(R)$ gravity models proposed by Hu-Sawicki and Starobinsky are generic for local gravity constraints to be evaded. The large deviations from these models either result into violation of local gravity constraints or the modifications are not dis
Externí odkaz:
http://arxiv.org/abs/0906.2460
Publikováno v:
Phys.Rev.D78:083515,2008
We study the $f(R)$ theory of gravity using metric approach. In particular we investigate the recently proposed model by Hu-Sawicki, Appleby $-$ Battye and Starobinsky. In this model, the cosmological constant is zero in flat space time. The model pa
Externí odkaz:
http://arxiv.org/abs/0807.3445
Publikováno v:
Phys.Lett.B663:424-428,2008
In this paper we have investigated the cosmological dynamics of non-locally corrected gravity involving a function of the inverse d'Alembertian of the Ricci scalar, $f(\Box^{-1} R))$. Casting the dynamical equations into local form, we derive the fix
Externí odkaz:
http://arxiv.org/abs/0803.2613
Publikováno v:
Eur.Phys.J.C53:447-457,2008
We investigate the possibility of a dark energy universe emerging from an action with higher-order string loop corrections to Einstein gravity in the presence of a massless dilaton. These curvature corrections (up to $R^4$ order) are different depend
Externí odkaz:
http://arxiv.org/abs/0705.1211
Autor:
Ibanez, J., Jhingan, S.
Publikováno v:
Int.J.Theor.Phys.46:2313-2325,2007
We revisit here the problem of generalized cosmology using renormalization group approach. A complete analysis of these cosmologies, where specific models appear as asymptotic fixed-points, is given here along with their linearized stability analysis
Externí odkaz:
http://arxiv.org/abs/gr-qc/0703046
Autor:
Ibanez, J., Jhingan, S.
Publikováno v:
Phys.Rev. D70 (2004) 063507
Soliton solutions are recovered as scale-invariant asymptotic states of vacuum inhomogeneous cosmologies using renormalization group method. The stability analysis of these states is also given.
Comment: 9 pages, minor corrections
Comment: 9 pages, minor corrections
Externí odkaz:
http://arxiv.org/abs/gr-qc/0405021