Parametrized post-Einsteinian gravitational waveforms in various modified theories of gravity

Binary pulsar constraints on the parametrized post- Einsteinian framework

Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. We constrain the parameterized post-Einsteinian framework with binary pulsar observations of orbital period decay d...

Radar ranging and Doppler tracking in post-Einsteinian metric theories of gravity

Accelerating Universe in Modified Theories of Gravity

We study cosmologies in modified theories of gravity considering Lagrangian density f(R) which is a polynomial function of scalar curvature (R) in the Einstein-Hilbert action in vacuum. The field equation obtained from the modified action corresponding to a Robertson-Walker metric is highly non-linear and not simple enough to obtain analytic solution. Consequently we adopt a numerical technique...

Inflationary Cosmology in Modified Gravity Theories

We review inflationary cosmology in modified gravity such as R gravity with its extensions in order to generalize the Starobinsky inflation model. In particular, we explore inflation realized by three kinds of effects: modification of gravity, the quantum anomaly, and the R term in loop quantum cosmology. It is explicitly demonstrated that in these inflationary models, the spectral index of sca...

Parametrized post-Newtonian expansion of Chern-Simons gravity