1 citations · 1 across the 1 of their papers we have counts for
6 papers
On the Basilica Operation
Jan Moritz Petschick, Karthika Rajeev
Inspired by the Basilica group , we describe a general construction which allows us to associate to any group of automorphisms of a roote…
No-boundary Wave Function, Wheeler-DeWitt Equation and Path Integral Analysis of the Bouncing `Quantum' Cosmology
Karthik Rajeev, Vikramaditya Mondal, Sumanta Chakraborty
Bouncing models are alternatives to inflationary cosmology that replace the initial Big-Bang singularity by a `bouncing' phase. A deeper understanding of the initial conditions of…
Complex time route to quantum backreaction
Karthik Rajeev
We consider the backreaction of a quantum system on an effectively classical degree of freedom that is interacting with it. The backreaction equation based on the standard…
Exploring the Rindler vacuum and the Euclidean Plane
Karthik Rajeev, T. Padmanabhan
In flat spacetime, two inequivalent vacuum states which arise rather naturally are the Rindler vacuum (R) and the Minkowski vacuum (M). We disuss several aspects of the Rindler vac…
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…
Quantum Correlators in Friedmann Spacetimes -The omnipresent de Sitter and the invariant vacuum noise
Kinjalk Lochan, Karthik Rajeev, Amit Vikram +1
We discuss several aspects of quantum field theory of a scalar field in a Friedmann universe, clarifying and highlighting several conceptual and technical issues. (A) We show that…