Journal
PHYSICS LETTERS B
Volume 765, Issue -, Pages 382-385Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2016.12.048
Keywords
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Funding
- SNSF Advanced Postdoc.Mobility Fellowship [161058]
- STFC Consolidated Grant for Astronomy and Astrophysics at the University of Edinburgh
- FCT grant [SFRH/BD/85164/2012]
- BIS National E-infrastructure capital grant [ST/J005673/1]
- STFC [ST/H008586/1, ST/K00333X/1]
- Science and Technology Facilities Council [ST/L000636/1, ST/J005673/1, ST/M00418X/1, ST/H008586/1, ST/M007065/1, ST/K00333X/1, ST/P000673/1] Funding Source: researchfish
- STFC [ST/L000636/1, ST/H008586/1, ST/M007065/1, ST/M00418X/1, ST/K00333X/1, ST/J005673/1, ST/P000673/1] Funding Source: UKRI
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With the advent of gravitational-wave astronomy marked by the aLIGO GW150914 and GW151226 observations, a measurement of the cosmological speed of gravity will likely soon be realised. We show that a confirmation of equality to the speed of light as indicated by indirect Galactic observations will have important consequences for a very large class of alternative explanations of the late-time accelerated expansion of our Universe. It will break the dark degeneracy of self-accelerated Horndeski scalar tensor theories in the large-scale structure that currently limits a rigorous discrimination between acceleration from modified gravity and from a cosmological constant or dark energy. Signatures of a self-acceleration must then manifest in the linear, unscreened cosmological structure. We describe the minimal modification required for self-acceleration with standard gravitational-wave speed and show that its maximum likelihood yields a 3 sigma poorer fit to cosmological observations compared to a cosmological constant. Hence, equality between the speeds challenges the concept of cosmic acceleration from a genuine scalar tensor modification of gravity. (C) 2016 The Author(s). Published by Elsevier B.V.
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