6 papers
The Positivity Geometry of Photon--Dark-Photon Effective Field Theories
Sayantan Chakraborty, Yash Dadhwal, Arun M. Thalapillil
We derive positivity bounds on the complete dimension-eight effective field theory of photons and a massless dark photon. The mixed gauge sector contains twelve CP-even Wilson coef…
New quantum information perspectives in the axion--photon and neutrino systems
Aaditya Datar, Arun M. Thalapillil, Palak Thareja
In this work, we broach a quantum information-theoretic treatment of axion--photon mixing. Motivated by an emerging class of quantum-enhanced axion searches, we analyse the two-lev…
Resurgence in the two-field scalar and spinor Quantum Electrodynamics Euler-Heisenberg Lagrangian
Drishti Gupta, Arun Thalapillil
We present the first systematic resurgent analysis of the Euler-Heisenberg Lagrangian in spinor and scalar quantum electrodynamics for the most general constant background field co…
Probing Exotic Astrophysical Dark objects through Astrometric Microlensing from Gaia
Lalit Singh Bhandari, Vikram Rentala, Arun M. Thalapillil +1
We present the first comprehensive study of astrometric microlensing by exotic astrophysical dark objects, focusing on two theoretically motivated models -- Q-ball and boson star.…
Resurgence in the Scalar Quantum Electrodynamics Euler-Heisenberg Lagrangian
Drishti Gupta, Arun M. Thalapillil
We explore the ideas of resurgence and Padé-Borel resummation in the Euler-Heisenberg Lagrangian of scalar quantum electrodynamics, which has remained largely unexamined in these…
Exploring Faraday rotation signatures and population bounds for primordial magnetic black holes
Arka Banerjee, Lalit Singh Bhandari, Ashwat Jain +1
Primordial black holes bearing magnetic charges may bypass the constraints imposed by Hawking radiation, thereby enabling reasonable present-day populations, even for masses below…