3 papers
hep-th2026
Semi-classical Imprint of Horizon Induced Instability
Arnab Chakraborty, Onirban Islam, Arshad Momen
We consider an inverted harmonic oscillator in the space of square-integrable functions on the circle and compute its density of states employing…
math.DG2026
A Lorentzian Equivariant Index Theorem
Onirban Islam, Lennart Ronge
We develop a formula for the equivariant index of a twisted Dirac operator on a compact globally hyperbolic spacetime with timelike boundary on which a group acts isometrically, su…
math.AP2024
On microlocalisation and the construction of Feynman Propagators for normally hyperbolic operators
Onirban Islam, Alexander Strohmaier
This article gives global microlocalisation constructions for normally hyperbolic operators on a vector bundle over a globally hyperbolic spacetime in geometric terms. As an applic…