Anisotropic stress as a signature of nonstandard propagation of gravitational waves.
- Saltas ID School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom.
- Sawicki I Départment de Physique Théorique and Center for Astroparticle Physics, Université de Genève, Quai Ernest-Ansermet 24, CH-1211 Genève 4, Switzerland and African Institute for Mathematical Sciences, 6 Melrose Road, Muizenberg 7945, South Africa.
- Amendola L Intitut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany.
- Kunz M Départment de Physique Théorique and Center for Astroparticle Physics, Université de Genève, Quai Ernest-Ansermet 24, CH-1211 Genève 4, Switzerland and African Institute for Mathematical Sciences, 6 Melrose Road, Muizenberg 7945, South Africa.
- 2014-11-22
Published in:
- Physical review letters. - 2014
English
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.
- Language
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- English
- Open access status
- green
- Identifiers
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- DOI 10.1103/PhysRevLett.113.191101
- PMID 25415893
- Persistent URL
- https://sonar.ch/global/documents/220371
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