3 papers
quant-ph2026
Tunneling from an oscillating initial state in quantum mechanics
Oliver Janssen, Matthew Kleban, Cameron Norton
We study the decay of general initial states out of a metastable potential well in quantum mechanics. We provide a closed-form expression for the probability current that tunnels t…
hep-th2024
Positivity bounds on electromagnetic properties of media
Paolo Creminelli, Oliver Janssen, Borna Salehian +1
We study the constraints imposed on the electromagnetic response of general media by microcausality (commutators of local fields vanish outside the light cone) and positivity of th…
hep-th2023
Non-analyticity of the -matrix with spontaneously broken Lorentz invariance
Paolo Creminelli, Matteo Delladio, Oliver Janssen +2
We study the -matrix of Goldstones in the renormalizable theory of a complex scalar at finite charge, i.e. in a state that breaks Lorentz invariance. The theory is weakly…