Strong Constraints on Cosmological Gravity from GW170817 and GRB 170817A
Tessa BakerUniversity of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, United KingdomEmilio BelliniUniversity of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, United KingdomPedro G. FerreiraUniversity of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, United KingdomMacarena LagosKavli Institue for Cosmological Physics, The University of Chicago, Chicago, Illinois 60637, USAJohannes NollerInstitute for Theoretical Studies, ETH Zurich, Clausiusstrasse 47, 8092 Zurich, SwitzerlandIgnacy SawickiCEICO, Fyzikální ústav Akademie věd ČR, Na Slovance 2, 182 21 Praha 8, Czech Republic
2017en
ABI
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The detection of an electromagnetic counterpart (GRB 170817A) to the gravitational-wave signal (GW170817) from the merger of two neutron stars opens a completely new arena for testing theories of gravity. We show that this measurement allows us to place stringent constraints on general scalar-tensor and vector-tensor theories, while allowing us to place an independent bound on the graviton mass in bimetric theories of gravity. These constraints severely reduce the viable range of cosmological models that have been proposed as alternatives to general relativistic cosmology.
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