Modak, B., Contreras, M.L., Gonzalez-Nilo, F., Torres, R.
Gonzalez-Nilo,F. Centro de Bioinformática, Universidad de Talca, 2 Norte 685, Casilla 721, Talca, Chile.
Noether symmetry in the higher order gravity theory (2003)
Sanyal, A. K., Modak, B., Rubano, C., Piedipalumbo, E.
Noether symmetry for higher order gravity theory has been explored, with the introduction of an auxiliary variable which gives the only correct quantum desccription of the theory, as shown in a...
Quantum Cosmology With R+R^2 Gravity (2001)
Canonical quantization of an action containing curvature squared term requires introduction of an auxiliary variable. Boulware etal[1] prescribed a technique to choose such a variable, by taking...
The form of the coupling of the scalar field with gravity and the potential have been found by applying Noether theorem to two dimensional minisuperspaces in induced gravity model. It has been...
Quantum cosmology with a curvature squared action (2001)
The correct quantum description for a curvature squared term in the action can be obtained by casting the action in the canonical form with the introduction of a variable which is the negative of the...
Evolution of Dynamical Coupling in Scalar Tensor Theory from Noether Symmetry (1999)
Modak, B., Kamilya, S., Biswas, S.
We present the gravitational coupling function $\omega(\phi)$ in the vacuum scalar-tensor theory as allowed by the Noether symmetry. We also obtain some exact cosmological solutions in the spatially...
Schwinger's Result On Particle Production From Complex Paths WKB Approximation (1999)
Biswas, S., Shaw, A., Modak, B.
This paper presents the derivation of Schwinger's gauge invariant result of $Im \cal{L}_{eff}$ upto one loop approximation, for particle production in an uniform electric field through the method of...
Time in Quantum Gravity (1999)
Biswas, S., Shaw, A., Modak, B.
The Wheeler-DeWitt equation in quantum gravity is timeless in character. In order to discuss quantum to classical transition of the universe, one uses a time prescription in quantum gravity to obtain...
Quantum Gravity Equation In Schroedinger Form In Minisuperspace Description (1999)
Biswas, S., Shaw, A., Modak, B., Biswas, D.
We start from classical Hamiltonian constraint of general relativity to obtain the Einstein-Hamiltonian-Jacobi equation. We obtain a time parameter prescription demanding that geometry itself...
Decoherence in the Starobinsky Model (1999)
Biswas, S., Shaw, A., Modak, B.
Starobinsky described an inflationary scenario in which quantum corrections to vacuum Einstein equations drive the inflation. The quantum cosmology of the model is studied by solving the...
Wormhole Dominance Proposal and Wave Function Discord (1999)
Biswas, S., Modak, B., Shaw, A.
Using the wormhole dominance proposal, it is shown that quantum corrections to the usual WKB ansatz for the wave function of the universe ably circumvent many of the drawbacks present in the current...
The Complex Time WKB Approximation And Particle Production (1999)
Biswas, S., Modak, B., Shaw, A.
The complex time WKB (CWKB) approximation has been an effective technique to understand particle production in curved as well as in flat spacetime. Earlier we obtained the standard results on...