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(28.04.) Causality and modifications to Einstein's gravity
Simon Caron-Huot (McGill U.)
28.04.2022 at 16:15
Does our world respect causality at all energy scales? We explore constraints on gravitational dynamics which stem from this assumption. Parameterizing long-distance effects of possible new heavy particles using effective field theory (EFT), we study causality of 2 to 2 scattering processes. Due to its energy growth, the gravitational force turns out to be particularly difficult to modify. I will present two-sided bounds which show that a wide class of modifications to four-dimensional Einstein's gravity require the existence of light higher-spin states, and speculate on their possible couplings to the Standard Model.
Arnold Sommerfeld Center
Theresienstrasse 37
Room 348