25 citations · 175 across the 16 of their papers we have counts for
16 papers
A viable form of the metric Teleparallel F(T) theory of gravity
Manas Chakrabortty, Nayem Sk, Abhik Kumar Sanyal
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 circumve…
Inflation with F(T) Teleparallel Gravity
Manas Chakrabortty, Nayem Sk, Susmita Sanyal +1
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 potentia…
Analyzing Conserved Currents in F(R) theory of gravity
Nayem Sk, Manas Chakrabortty, Abhik Kumar Sanyal
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 suc…
Some aspects of modified theory of gravity in Palatini formalism unveiled
Manas Chakrabortty, Nayem Sk, Abhik Kumar Sanyal
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 kinet…
On the equivalence between different canonical forms of F(R) theory of gravity
Nayem Sk., Abhik Kumar Sanyal
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,…
Noether symmetry in teleparallel gravity
Nayem Sk
Hao Wei et.al. has claimed in that Noether symmetry in the context of teleparallel theory of gravity admits $f(T)\propto T^{…
Noether Symmetry of Palatini gravity
Nayem Sk
In metric formalism, Noether symmetry of F(R) theory of gravity in vacuum and in the presence of pressureless dust yields along with the conserved curre…
Why scalar-tensor equivalent theories are not physically equivalent?
Nayem Sk., Abhik Kumar Sanyal
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 math…
Canonical formulation of Pais-Ulhenbeck action and resolving the issue of branched Hamiltonian
Kaushik Sarkar, Nayem Sk, Ranajit Mandal +1
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 gene…
Validating variational principle for higher order theory of gravity
Soumendranath Ruz, Kaushik Sarkar, Nayem Sk +1
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 th…
Field independent cosmic evolution
Nayem Sk., Abhik Kumar Sanyal
It has been shown earlier that Noether symmetry does not admit a form of F(R) corresponding to an action in which F(R) is coupled to scalar-tensor action for gravity or even for pu…
Revisiting conserved currents in F(R) theory of gravity via Noether symmetry
Nayem Sk., Abhik Kumar Sanyal
Noether symmetry of F(R) theory of gravity in vacuum and in the presence of pressureless dust yields F(R) \propto R^{3/2} along with the conserved current \frac{d}{dt}(a\sqrt R) in…
Revisiting Noether gauge symmetry for F(R) theory of gravity
Nayem Sk., Abhik Kumar Sanyal
Noether gauge symmetry for F(R) theory of gravity has been explored recently. The fallacy is that, even after setting gauge to vanish, the form of F(R) \propto R^n (where n \neq 1,…
Revisiting Noether symmetry approach in F(R)-tachyon Model
Nayem Sk., Abhik Kumar Sanyal
Recently, some authors have made a falsifiable claim that Noether gauge symmetry for F(R) theory of gravity coupled to a tachyon field enforces gauge to vanish and leads to F(R) \p…
Viability of Noether symmetry of F(R) theory of gravity
Kaushik Sarkar, Nayem Sk., Subhra Debnath +1
Canonization of F(R) theory of gravity to explore Noether symmetry is performed treating R - 6(\frac{\ddot a}{a} + \frac{\dot a^2}{a^2} + \frac{k}{a^2}) = 0 as a constraint of the…
Why Noether symmetry of F(R) theory yields three-half power law?
Kaushik Sarkar, Nayem Sk., Soumendranath Ruz +2
Noether symmetry of F(R) theory of gravity in vacuum or in matter dominated era yields three-half power law of R. We show that this particular curvature invariant term is very spec…