4 papers
Massive Gravity is not Positive
Brando Bellazzini, Giulia Isabella, Sara Ricossa +1
We derive new positivity bounds at finite momentum transfer, assuming a large separation between the mass of the lightest particle in the effective theory and the mass gap …
Positivity with Long-Range Interactions
B. Bellazzini, J. Berman, G. Isabella +3
We introduce infrared finite, analytic, crossing symmetric, Regge behaved, and Lorentz invariant amplitudes , labeled by the experimental energy resolut…
(Super)Gravity from Positivity
Brando Bellazzini, Alex Pomarol, Marcello Romano +1
We investigate whether the effective theory for isolated, massive, and weakly interacting spin- particles is compatible with causality and unitarity-i.e., the positivity of sc…
Continuous-Spin Particles, On Shell
Brando Bellazzini, Stefano De Angelis, Marcello Romano
We study on-shell scattering amplitudes for continuous-spin particles (CSPs). Poincaré invariance, little-group covariance, analyticity, and on-shell factorisation (unita…