Nonsingular Phantom Cosmology in Five-Dimensional f(R, T) Gravity
نویسندگان
چکیده
We obtain exact solutions to the field equations for five-dimensional locally rotationally symmetric (LRS) Bianchi type-I spacetime in f(R,T) theory of gravity, where specifically, following three cases are considered: (i) f(R,T)=μ(R+T), (ii) f(R,T)=Rμ+RTμ2, and (iii) f(R,T)=R+μR2+μT, R T, respectively, Ricci scalar trace energy–momentum tensor. It is found that equation state (EOS) parameter w governed by μ involved expressions. fine-tune effect phantom energy model. However, we also restrict this a stable model universe.
منابع مشابه
Nonsingular Dilaton Cosmology
We study spatially homogeneous and isotropic solutions to the equations of motion derived from dilaton gravity, in the presence of a special combination of higher derivative terms in the gravitational action. All solutions are nonsingular. For initial conditions resembling those in the pre-big-bang scenario, there are solutions corresponding to a spatially flat, bouncing Universe originating in...
متن کاملNonsingular Dilaton Cosmology in the String Frame
One of the paramount problems manifest in modern cosmological theories is that of the initial singularity. Gasperini and Veneziano have proposed the pre-big-bang (PBB) model [2] based on the assumption that the Universe evolved out of a ten-dimensional Minkowski spacetime which is an exact vacuum of string theory, in hopes of resolving the singularity problem. Recently, Brandenberger, Easther a...
متن کاملf(T) teleparallel gravity and cosmology.
Over recent decades, the role of torsion in gravity has been extensively investigated along the main direction of bringing gravity closer to its gauge formulation and incorporating spin in a geometric description. Here we review various torsional constructions, from teleparallel, to Einstein-Cartan, and metric-affine gauge theories, resulting in extending torsional gravity in the paradigm of f ...
متن کاملSelf-Gravitating Global Monopole and Nonsingular Cosmology
We review some recent results concerning the properties of a spherically symmetric global monopole in (D = d+2)-dimensional general relativity. Some common features of monopole solutions are found independently of the choice of the symmetry-breaking potential. Thus, the solutions show six types of qualitative behavior and can contain at most one simple horizon. For the standard Mexican hat (Hig...
متن کاملGravitation and Cosmology in Generalized (1+1)-dimensional dilaton gravity
The actions of the “R = T” and string-inspired theories of gravity in (1+1) dimensions are generalized into one single action which is characterized by two functions. We discuss differing interpretations of the matter stress-energy tensor, and show how two such different interpretations can yield two different sets of field equations from this action. The weak-field approximation, post-Newtonia...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Universe
سال: 2022
ISSN: ['2218-1997']
DOI: https://doi.org/10.3390/universe8110573