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pro vyhledávání: '"Sk., Nayem"'
Unlike F(R) gravity, pure metric F(T) gravity in the vacuum dominated era, ends up with an imaginary action and is therefore not feasible. This eerie situation may only be circumvented by associating a scalar field, which can also drive inflation in
Externí odkaz:
http://arxiv.org/abs/2304.04180
Publikováno v:
Euro.Phys.J.Plus, 2021
We study early universe with a particular form of F(T) Telleparallel gravity theory, in which inflation is driven by a scalar field. To ensure slow rollover, two different potentials are chosen in a manner, such that they remain almost flat for large
Externí odkaz:
http://arxiv.org/abs/2112.09609
F(R) theory of gravity is claimed to admit a host of conserved currents under the imposition of Noether symmetry following various techniques. However, for a constrained system such as gravity, Noether symmetry is not on-shell. As a result, the symme
Externí odkaz:
http://arxiv.org/abs/2010.13950
Under conformal transformation, f(R) theory of gravity in Palatini formalism leads to a Brans-Dicke type of scalar-tensor equivalent theory with a wrong sign in the effective kinetic energy term. This means, the effective scalar acts as the dark ener
Externí odkaz:
http://arxiv.org/abs/1909.10003
Autor:
Sk., Nayem, Sanyal, Abhik Kumar
Classical equivalence between Jordan's and Einstein's frame counterparts of F(R) theory of gravity has recently been questioned, since the two produce different Noether symmetries, which couldn't be translated back and forth using transformation rela
Externí odkaz:
http://arxiv.org/abs/1708.02624
Autor:
Sk, Nayem
Hao Wei et.al. has claimed in $\mathrm{Phys. Lett. \textbf{B707}, 298 (2012)}$ that Noether symmetry in the context of teleparallel $f(T)$ theory of gravity admits $f(T)\propto T^{n}$, (where $n$ is an arbitrary) in matter domain era in Friedmann- Ro
Externí odkaz:
http://arxiv.org/abs/1706.00537
Autor:
Sk, Nayem
In metric formalism, Noether symmetry of F(R) theory of gravity in vacuum and in the presence of pressureless dust yields $F(R)\propto R^\frac{3}{2}$ along with the conserved current $\frac{d}{dt} (a\sqrt R)$ in Robertson-Walker metric and nothing el
Externí odkaz:
http://arxiv.org/abs/1610.07445
Autor:
Sk., Nayem, Sanyal, Abhik Kumar
Publikováno v:
IJMPD, Vol. 26 (2017) 1750162 (18 pages)
Whether Jordan's and Einstein's frame descriptions of F(R) theory of gravity are physically equivalent, is a long standing debate. However, practically none questioned on true mathematical equivalence, since classical field equations may be translate
Externí odkaz:
http://arxiv.org/abs/1609.01824
Shortcomings of Dirac's constrained analysis in the context of fourth order Pais-Uhlenbeck oscillator action and the appearance of badly affected phase-space Hamiltonian for a generalized fourth order oscillator action, following Ostrogradski, Dirac
Externí odkaz:
http://arxiv.org/abs/1507.03444
Metric variation of higher order theory of gravity requires to fix the Ricci scalar in addition to the metric tensor at the boundary. Fixing Ricci scalar at the boundary implies that the classical solutions are fixed once and forever to the de-Sitter
Externí odkaz:
http://arxiv.org/abs/1505.00740