21 citations · 81 across the 9 of their papers we have counts for
5 papers · 1 filter
Early universe in view of a modified theory of gravity
Ranajit Mandal, Dalia Saha, Mohosin Alam +1
We study the quantum evolution of the early universe, its semi-classical analogue together with inflationary regime, in view of a generalized modified theory of gravity. The action…
Probing the early universe with a generalized action
Ranajit Mandal, Dalia Saha, Mohosin Alam +1
Possibly, the most general action in the background of isotropic and homogeneous space-time has been considered to study the quantum evolution of the early universe, apart from a c…
Early Universe with modified scalar-tensor theory of gravity
Ranajit Mandal, Chandramouli Sarkar, Abhik Kumar Sanyal
Scalar-tensor theory of gravity with non-minimal coupling is a fairly good candidate for dark energy, required to explain late-time cosmic evolution. Here we study the very early s…
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…
Resolving the issue of branched Hamiltonian in modified Lanczos-Lovelock gravity
Soumendranath Ruz, Ranajit Mandal, Subhra Debnath +1
The Hamiltonian constraint Hc = NH = 0, defines a diffeomorphic structure on spatial manifolds by the lapse function N in general theory of relativity. However, it is not manifest…