TY - JOUR
T1 - Constraints on general second-order scalar-tensor models from gravitational Cherenkov radiation
AU - Kimura, Rampei
AU - Yamamoto, Kazuhiro
PY - 2012/7
Y1 - 2012/7
N2 - 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.
AB - 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.
KW - Modified gravity
KW - cosmological perturbation theory
KW - gravitational waves / theory
UR - http://www.scopus.com/inward/record.url?scp=84864471899&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84864471899&partnerID=8YFLogxK
U2 - 10.1088/1475-7516/2012/07/050
DO - 10.1088/1475-7516/2012/07/050
M3 - Article
AN - SCOPUS:84864471899
VL - 2012
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
SN - 1475-7516
IS - 7
M1 - 50
ER -