Zobrazeno 1 - 10
of 90
pro vyhledávání: '"Gangopadhyay, Debashis"'
Publikováno v:
Fortschritte der Physik, 2024
We show that the Raychaudhuri equation remains form invariant for certain solutions of scalar fields $\phi$ whose Lagrangian is non-canonical and of the form $\mathcal{L}(X,\phi)=-V(\phi)F(X)$, with $X=\frac{1}{2} g_{\mu\nu} \nabla^{\mu}\phi \nabla^{
Externí odkaz:
http://arxiv.org/abs/2404.11632
In this work, we develop the Raychaudhuri equation in $f(\bar{R},\bar{T})$ gravity in the setting of a non-canonical theory, namely K-essence theory. We solve the modified Raychaudhuri equation for the additive form of $f(\bar{R},\bar{T})$, which is
Externí odkaz:
http://arxiv.org/abs/2402.18431
Publikováno v:
In Astroparticle Physics February 2025 165
Publikováno v:
Physics of The Dark Universe, Volume 32, May 2021, 100800
We obtain a scaling relation for spherically symmetric k-essence scalar fields $\phi(r,t)$ for an inhomogeneous cosmology with the Lemaitre-Tolman- Bondi (LTB) metric. We show that this scaling relation reduces to the known relation for a homogeneous
Externí odkaz:
http://arxiv.org/abs/2108.04234
Three flavoured neutrino oscillations are investigated in the light of the Leggett-Garg inequality. The outline of an experimental proposal is suggested whereby the findings of this investigation may be verified. The results obtained are: (a) The max
Externí odkaz:
http://arxiv.org/abs/1702.04646
Publikováno v:
Physics of the Dark Universe, Volume 32, May 2021, 100800
We obtain a scaling relation for spherically symmetric k-essence scalar fields $\phi(r,t)$ for an inhomogeneous cosmology with the Lemaitre-Tolman- Bondi (LTB) metric. We show that this scaling relation reduces to the known relation for a homogeneous
Externí odkaz:
http://arxiv.org/abs/1602.01289
Publikováno v:
In Physics of the Dark Universe May 2021 32
Publikováno v:
Journal of Mathematical Sciences & Computational Mathematics, Vol-1, No-4, 462-483, (2020)
A modified gravity theory with $f(R)=R^2$ coupled to a dark energy lagrangian $L=-V(\phi)F(X)$ , $X=\nabla_{\mu}\phi\nabla^{\mu}\phi$, gives plausible cosmological scenarios when the modified Friedman equations are solved subject to the scaling relat
Externí odkaz:
http://arxiv.org/abs/1512.05341
Autor:
Gangopadhyay, Debashis, Manna, Goutam
We obtain the analogues of the Friedman equations in an emergent gravity scenario in the presence of dark energy. The background metric is taken to be Friedman-Lemaitre-Robertson-Walker (FLRW). We show that if $\dot\phi ^{2}$ is the dark energy densi
Externí odkaz:
http://arxiv.org/abs/1502.06255
A phenomenological model is described for Cosmic Microwave Background Radiation (CMBR) evolution with dark energy an essential ingredient in the form of a $k-$essence scalar field. The following features of this evolution can be successfully obtained
Externí odkaz:
http://arxiv.org/abs/1406.2308