Observational constraints on a Yang-Mills condensate dark energy model

Observational constraints on holographic tachyonic dark energy in interaction with dark matter

Observational constraints on Hubble constant and deceleration parameter in power-law cosmology

Observational constraints on spatial anisotropy of G from orbital motions

Observational Constraints on the Completeness of Space near Astrophysical Objects

Observational cosmology using characteristic numerical relativity

Observational cosmology using characteristic numerical relativity: Characteristic formalism on null geodesics

Observational Features of Black Holes

Observational hints on the Big Bounce

Observational Limit on Gravitational Waves from Binary Neutron Stars in the Galaxy

Observational signatures of a non-singular bouncing cosmology

Observational test of inflation in loop quantum cosmology

Observational upper limits on the gravitational wave production of core collapse supernovae

Observationally Verifiable Predictions of Modified Gravity

Observed threshold anomalies as the first hope of a manifestation of Planck-length physics

Observer dependence of the quasi-local energy and momentum in Schwarzschild space-time

Observer Dependent Horizon Temperatures: a Coordinate-Free Formulation of Hawking Radiation as Tunneling

Observers in an accelerated universe

Observing alternatives to inflation

Observing binary inspiral in gravitational radiation: One interferometer