Neutron star merger GW170817 strongly constrains doubly coupled bigravity
arXiv:1803.09726 · doi:10.1103/PhysRevD.97.124010
Abstract
We study the implications of the recent detection of gravitational waves emitted by a pair of merging neutron stars and their electromagnetic counterpart, events GW170817 and GRB170817A, on the viability of the doubly coupled bimetric models of cosmic evolution, where the two metrics couple directly to matter through a composite, effective metric. We demonstrate that the bounds on the speed of gravitational waves place strong constraints on the doubly coupled models, forcing either the two metrics to be proportional at the background level or the models to become singly coupled. Proportional backgrounds are particularly interesting as they provide stable cosmological solutions with phenomenologies equivalent to that of CDM at the background level as well as for linear perturbations, while nonlinearities are expected to show deviations from the standard model.
arXiv comment21 pages in two-column format, 7 figures. V2: matches published version
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