465 citations · 3.4k across the 70 of their papers we have counts for
70 papers
A Measure for Quantum Paths, Gravity and Spacetime Microstructure
T. Padmanabhan
The number of classical paths of a given length, connecting any two events in a (pseudo) Riemannian spacetime is, of course, infinite. It is, however, possible to define a useful,…
Generalized Schwinger effect and particle production in an expanding universe
Karthik Rajeev, Sumanta Chakraborty, T. Padmanabhan
We discuss several aspects of particle production in: (a) time dependent electric field and (b) expanding Friedmann background. In the first part of the paper, we provide an algebr…
Demystifying the constancy of the Ermakov-Lewis invariant for a time dependent oscillator
T. Padmanabhan
It is well known that the time dependent harmonic oscillator possesses a conserved quantity, usually called Ermakov-Lewis invariant. I provide a simple physical interpretation of t…
A comment on generalized Schwinger effect
Karthik Rajeev, Sumanta Chakraborty, T. Padmanabhan
A spatially homogeneous, time-dependent, electric field can produce charged particle pairs from the vacuum. When the electric field is constant, the mean number of pairs which are…
Inverting a normal harmonic oscillator: Physical interpretation and applications
Karthik Rajeev, Sumanta Chakraborty, T. Padmanabhan
A harmonic oscillator with time-dependent mass and a time-dependent (squared) frequency occurs in the modelling of several physical systems. It is generally believe…
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…