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08.01.2020 / 14:30 - 15:30 / Hamburg, Bldg. 2a, SR 2
Theory ColloquiumImpossible Theories of Gravity
Brando Bellazzini (Institute de Physique Theorique, CEA/Saclay)
Not every effective theory of fields and gravitational interactions at low energy can be embedded into a consistent theory of gravity at short distances. I will discuss how fundamental properties of scattering amplitudes, such as unitarity and causality of the underlying fundamental theory, can be used to spot inconsistent theories of gravity at low-energy, and hence throw them in the so-called ``swampland'’. I will focus on two general applications: the weak gravity conjecture for the physics of extremal black holes; and modified gravity theories of interest for late-time cosmology.
