24 citations · 153 across the 16 of their papers we have counts for
7 papers · 1 filter
New Kind of Echo from Quantum Black Holes
Sreenath K. Manikandan, Karthik Rajeev
We propose that a quantum black hole can produce a new kind of late-time gravitational echoes, facilitated by a near-horizon process analogous to Andreev reflection in condensed ma…
Wave function of the Universe as a sum over eventually inflating universes
Karthik Rajeev
We consider a proposal to define the wave function of the Universe as a sum over spacetimes that eventually inflate. In the minisuperspace model, we explicitly show that a simple f…
Maximal subgroups of a family of iterated monodromy groups
Karthika Rajeev, Anitha Thillaisundaram
The Basilica group is a well-known 2-generated weakly branch, but not branch, group acting on the binary rooted tree. Recently a more general form of the Basilica group has been in…
Bouncing with shear: Implications from quantum cosmology
Karthik Rajeev, Vikramaditya Mondal, Sumanta Chakraborty
We consider the introduction of anisotropy in a class of bouncing models of cosmology. The presence of anisotropy often spells doom on bouncing models, since the energy density due…
Lorentzian worldline path integral approach to Schwinger effect
Karthik Rajeev
We demonstrate that the positive frequency modes for a complex scalar field in a constant electric field (Schwinger modes), in three different gauges, can be represented as exact L…
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…