Constraints on general second-order scalar-tensor models from gravitational Cherenkov radiation
Journal Article
·
· Journal of Cosmology and Astroparticle Physics
- Department of Physical Science, Hiroshima University, Higashi-Hiroshima 739-8526 (Japan)
We demonstrate that the general second-order scalar-tensor theories, which have attracted attention as possible modified gravity models to explain the late time cosmic acceleration, could be strongly constrained from the argument of the gravitational Cherenkov radiation. To this end, we consider the purely kinetic coupled gravity and the extended galileon model on a cosmological background. In these models, the propagation speed of tensor mode could be less than the speed of light, which puts very strong constraints from the gravitational Cherenkov radiation.
- OSTI ID:
- 22279848
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2012, Issue 07; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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