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Article

Non-analyticity of the S-matrix with spontaneously broken Lorentz invariance

We study the S-matrix of Goldstones in the renormalizable theory of a U(1) complex scalar at finite charge, i.e. in a state that breaks Lorentz invariance. The theory is weakly coupled so that this S-matrix exist...

Paolo Creminelli, Matteo Delladio, Oliver Janssen… in Journal of High Energy Physics (2024)