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- W3103476562 abstract "We identify a scalar-tensor model embedded in the Horndeski action whose cosmological background and linear scalar fluctuations are degenerate with the concordance cosmology. The model admits a self-accelerated background expansion at late times that is stable against perturbations with a sound speed attributed to the new field that is equal to the speed of light. While degenerate in scalar fluctuations, self-acceleration of the model implies a present cosmological tensor mode propagation at ≲95 % of the speed of light with a damping of the wave amplitude that is ≳5 % less efficient than in general relativity. We show that these discrepancies are endemic to self-accelerated Horndeski theories with degenerate large-scale structure and are tested with measurements of gravitational waves emitted by events at cosmological distances. Hence, gravitational-wave cosmology breaks the dark degeneracy in observations of the large-scale structure between two fundamentally different explanations of cosmic acceleration—a cosmological constant and a scalar-tensor modification of gravity. The gravitational wave event GW150914 recently detected with the aLIGO instruments and its potential association with a weak short gamma-ray burst observed with the Fermi GBM experiment may have provided this crucial measurement." @default.
- W3103476562 created "2020-11-23" @default.
- W3103476562 creator A5025963003 @default.
- W3103476562 creator A5032234559 @default.
- W3103476562 date "2016-03-16" @default.
- W3103476562 modified "2023-10-15" @default.
- W3103476562 title "Breaking a dark degeneracy with gravitational waves" @default.
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- W3103476562 doi "https://doi.org/10.1088/1475-7516/2016/03/031" @default.
- W3103476562 hasPublicationYear "2016" @default.
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