Anisotropic stress as a signature of nonstandard propagation of gravitational waves
We make precise the heretofore ambiguous statement that anisotropic stress is a sign of a modification of gravity. We show that in cosmological solutions of very general classes of models extending gravity-all scalar-tensor theories (Horndeski), Einstein-aether models, and bimetric massive gravity-a...
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| Published in | Physical review letters Vol. 113; no. 19; p. 191101 |
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| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
07.11.2014
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| Online Access | Get more information |
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| Summary: | We make precise the heretofore ambiguous statement that anisotropic stress is a sign of a modification of gravity. We show that in cosmological solutions of very general classes of models extending gravity-all scalar-tensor theories (Horndeski), Einstein-aether models, and bimetric massive gravity-a direct correspondence exists between perfect fluids apparently carrying anisotropic stress and a modification in the propagation of gravitational waves. Since the anisotropic stress can be measured in a model-independent manner, a comparison of the behavior of gravitational waves from cosmological sources with large-scale-structure formation could, in principle, lead to new constraints on the theory of gravity. |
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| ISSN: | 1079-7114 |
| DOI: | 10.1103/physrevlett.113.191101 |