170 citations · 540 across the 11 of their papers we have counts for
8 papers · 1 filter
Amplifying quantum discord during inflationary magnetogenesis through violation of parity
Sagarika Tripathy, Rathul Nath Raveendran, Krishnamohan Parattu +1
It is well known that, during inflation, the conformal invariance of the electromagnetic action has to be broken in order to produce magnetic fields of observed strengths today. Of…
Null boundary terms for Lanczos-Lovelock gravity
Sumanta Chakraborty, Krishnamohan Parattu
We derive boundary terms appropriate for the general Lanczos-Lovelock action on a null boundary, when Dirichlet boundary conditions are imposed. We believe that these boundary term…
A Novel Derivation of the Boundary Term for the Action in Lanczos-Lovelock Gravity
Sumanta Chakraborty, Krishnamohan Parattu, T. Padmanabhan
We present a novel derivation of the boundary term for the action in Lanczos-Lovelock gravity, starting from the boundary contribution in the variation of the Lanczos-Lovelock acti…
Variational Principle for Gravity with Null and Non-null boundaries: A Unified Boundary Counter-term
Krishnamohan Parattu, Sumanta Chakraborty, T. Padmanabhan
It is common knowledge that the Einstein-Hilbert action does not furnish a well-posed variational principle. The usual solution to this problem is to add an extra boundary term to…
Gravitational field equations near an arbitrary null surface expressed as a thermodynamic identity
Sumanta Chakraborty, Krishnamohan Parattu, T. Padmanabhan
Previous work has demonstrated that the gravitational field equations in all Lanczos-Lovelock models imply a thermodynamic identity TdS=dE+PdV (where the variations are interpreted…
A Boundary Term for the Gravitational Action with Null Boundaries
Krishnamohan Parattu, Sumanta Chakraborty, Bibhas Ranjan Majhi +1
Constructing a well-posed variational principle is a non-trivial issue in general relativity. For spacelike and timelike boundaries, one knows that the addition of the Gibbons-Hawk…