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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…
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…
Positivity bounds on effective field theories with spontaneously broken Lorentz invariance
Paolo Creminelli, Oliver Janssen, Leonardo Senatore
We derive positivity bounds on EFT coefficients in theories where boosts are spontaneously broken. We employ the analytic properties of the retarded Green's function of conserved c…
On the asymptotics of 3+1D cosmologies with bounded scalar potential and isometry group forming 2-dimensional orbits
Jinhui Wang, Leonardo Senatore
We study the onset of inflation in 3+1 dimensional cosmologies with an inflationary potential satisfying , matter satisfying the dominant and strong en…
A de Sitter no-hair theorem for 3+1d Cosmologies with isometry group forming 2-dimensional orbits
Paolo Creminelli, Or Hershkovits, Leonardo Senatore +1
We study, using Mean Curvature Flow methods, 3+1 dimensional cosmologies with a positive cosmological constant, matter satisfying the dominant and the strong energy conditions, and…
in dS
Victor Gorbenko, Leonardo Senatore
We resolve the issue of infrared divergences present in theories of light scalar fields on de Sitter space.