O(d,d)-invariance in inhomogeneous string cosmologies with perfect fluid

O(N) Quantum fields in curved spacetime

Observability and Geometry in Three dimensional quantum gravity

Observability of the total inflationary expansion

Observable consequences of quantum gravity: Can light fermions exist?

Observable effects from extra dimensions

Observable effects from spacetime tunneling

Observable Effects of Scalar Fields and Varying Constants

Observable Equivalence between General Relativity and Shape Dynamics

Observable form of pulses emitted from relativistic collapsing objects

Observable frequency shifts via spin-rotation coupling

Observable Properties of Orbits in Exact Bumpy Spacetimes

Observable Quantities in Weyl Gravity

Observables and a Hilbert Space for Bianchi IX

Observables and cohomology classes for classical gravitational field

Observables and gauge invariance in the theory of non-linear spacetime perturbations

Observables for bound orbital motion in axially symmetric space-times

Observables for FRW model with cosmological constant in the framework of loop cosmology

Observables for spacetimes with two Killing field symmetries

Observables for Two-Dimensional Black Holes