Reduction of a Quantum Theory

Reduction of coating thermal noise by using an etalon

Reduction of entanglement degradation and teleportation improvement in Einstein-Gauss-Bonnet gravity

Reduction of quantum noise and increase of amplification of gravitational waves signals in Michelson interferometer by the use of squeezed states

Reduction of the effective mass of the Reissner-Nordstrom spacetime

Reduction of thermal fluctuations in a cryogenic laser interferometric gravitational wave detector

Reference Fluids as Standards of Space and Time

Reference Frame in General Relativity

Reference frames and rigid motions in relativity

Reference frames and rigid motions in relativity: Applications

Reference Frames and the Physical Gravito-Electromagnetic Analogy

Reference Frames, Gauge Transformations and Gravitomagnetism in the Post-Newtonian Theory of the Lunar Motion

Refined algebraic quantisation with the triangular subgroup of SL(2,R)

Refined Algebraic Quantization and Quantum Field Theory in Curved Space-Time

Refined Algebraic Quantization in the oscillator representation of SL(2,R)

Refined Algebraic Quantization: Systems with a single constraint

Refinements of the Weyl tensor classification in five dimensions

Reflection and Transmission at the Apparent Horizon during Gravitational Collapse

Reflection coefficient for superresonant scattering

Reflection from black holes