Journal
PHYSICAL REVIEW D
Volume 97, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.97.124010
Keywords
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Funding
- Netherlands Organization for Scientific Research (NWO)
- Dutch Ministry of Education, Culture and Science (OCW)
- D-ITP consortium, a program of the NWO - OCW
- STFC [ST/ L000385/1, ST/L000636/1]
- Sitter Ph.D. fellowship of NWO
- EU [690575]
- COST (European Cooperation in Science and Technology) [CA15117]
- STFC [ST/P000681/1, ST/P000673/1, ST/L000385/1] Funding Source: UKRI
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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 Lambda CDM at the background level as well as for linear perturbations, while nonlinearities are expected to show deviations from the standard model.
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