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Inflationary non-Gaussianities in the most general second-order scalar-tensor theories
Inflationary non-Gaussianities in the most general second-order scalar-tensor theories
2011/10/14
For very general scalar-field theories in which the equations of motion are at second-order, we evaluate the three-point correlation function of primordial scalar perturbations generated during inflat...
Time-varying G in shift-symmetric scalar-tensor theories with a Vainshtein mechanism
shift-symmetric scalar-tensor theories Vainshtein mechanism
2011/10/18
We show that the current bounds on the time variation of the Newton constant G can put severe constraints on many interesting scalar-tensor theories which possess a shift symmetry and a nonminimal mat...
10-Dimensional Cosmology With Gauss-Bonnet Gravity In Generalized Scalar-Tensor Theories From Superstring Theories
Gauss-Bonnet gravity higher-dimensions generalized scalar-tensor theories dark energy
2010/6/30
Superstring theories are promising candidates for unifying gravity with all matter interactions. In this work, we discussed a particular 10-dimensional cosmology based on Gauss-Bonnet invariant term c...
On Some Aspects of Gravitomagnetism in Scalar-Tensor Theories of Gravity
Gravitomagnetism Scalar-Tensor Theories of Gravity
2010/10/15
We discuss the gravitomagnetism in the context of scalar-tensor theories of gravity. We obtain the equation of motion of a particle in terms of gravitoelectric and gravitomagnetic fields. We discuss t...