Ivashchuk, V. D.
Published in
Gravitation and Cosmology

AbstractWe study a \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$D$$\end{document}-dimensional Einstein–Gauss–Bonnet gravitational model including the Gauss-Bonnet te...

Ignat’ev, Yu. G. Ignat’ev, D. Yu.
Published in
Gravitation and Cosmology

AbstractBased on the macroscopic equations of cosmological evolution obtained earlier by the author, a closed set of macroscopi Einstein equations in the short-wave approximation for perturbations of the scalar Higgs and gravitational fields has been obtained and examined. The resulting exact solutions of the macroscopic equations are determined by...

Ahmed, Faizuddin
Published in
Gravitation and Cosmology

AbstractAn axially symmetric nonvacuum solution of the Einstein field equations, regular everywhere and free from curvature divergence is presented. The matter-energy content is a the pure radiation field satisfying the energy conditions, and the metric is of type N in the Petrov classification scheme. The space-time develops circular closed timeli...

Kahil, Magd E.
Published in
Gravitation and Cosmology

AbstractSpinning equations of Finslerian gravity, the counterpart of the Mathisson-Papapetrou spinning equations of motion are obtained. Two approaches of Finslerian geometries are formulated and discussed, the Cartan-Rund and Finsler-Cartan ones, as well as their corresponding spinning equations. The significance of the nonlinear connection and it...

Bhattacharjee, Snehasish Sahoo, P. K.
Published in
Gravitation and Cosmology

Abstract\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$f(R,T)$$\end{document} gravity is a widely used extended theory of gravity introduced by Harko et al., which is ...

Bronnikov, K. A. Bolokhov, S. V. Skvortsova, M. V.
Published in
Gravitation and Cosmology

AbstractThe hybrid metric-Palatini theory of gravity (HMPG), proposed in 2012 by T. Harko et al., is known to successfully describe both local (solar-system) and cosmological observations. We discuss static, spherically symmetric vacuum solutions of HMPG with the aid of its scalar-tensor theory (STT) representation. This scalar-tensor theory coinci...

Ganguly, Aritra Choudhuri, Amitava
Published in
Gravitation and Cosmology

AbstractCosmological density perturbations governed by Newtonian and MONDian force laws scenarios for the period from matter domination to recombination have been investigated. Particularly, we find solutions for the density contrast equations obtained for both cases with respect to a homogeneous spatially flat Friedman-Lemaître-Robertson-Walker (F...

Dumin, Yu. V.
Published in
Gravitation and Cosmology

AbstractIt was suggested in our previous paper [Yu.V. Dumin, Grav. Cosmol. 25, 169 (2019)] that the cosmological Dark Energy might be mediated by the time–energy uncertainty relation in the Mandelstam–Tamm form, which is appropriate for the long-term evolution of quantum systems. The amount of such Dark Energy gradually decays with time, and the co...

Debnath, Ujjal Basak, Soumyadipta
Published in
Gravitation and Cosmology

AbstractWe study the accretion of dark matter and dark energy onto \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$(n+2)$$\end{document}-dimensional Morris–Thorne wormh...

Pavlov, A. E.
Published in
Gravitation and Cosmology

AbstractThe reduced vacuum Hamiltonian equations of conformal geometrodynamics of compact manifolds in extrinsic time are written. This is achieved by generalizing the theorem of implicit function derivative to the functional analysis. Under the assumption that constant curvature slicing takes place, York’s field time becomes the global time.