Positivity of Amplitudes, Weak Gravity Conjecture, and Modified Gravity.
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DOI: 10.1103/physrevlett.123.251103
Abstract: We derive new positivity bounds for scattering amplitudes in theories with a massless graviton in the spectrum in four spacetime dimensions, of relevance for the weak gravity conjecture and modified gravity theories. The bounds imply… read more here.
Keywords: weak gravity; modified gravity; gravity; gravity conjecture ... See more keywords