Unifying Einstein and Palatini gravities

Unimodular bimode gravity and the coherent scalar-graviton field as galaxy dark matter

Unimodular conformal and projective relativity

Unimodular Gravity and Averaging

Unimodular Loop Quantum Cosmology

Unimodular metagravity vs. General Relativity with a scalar field

Unimodular relativity and cosmological constant

Unimodular relativity and cosmological constant : Comments

Unimodular Relativity and the Dark Matter Problem

Unique characterization of the Bel-Robinson tensor

Unique continuation for the vacuum Einstein equations

Unique determination of an inner product by adjointness relations in the algebra of quantum observables

Unique factor ordering in the continuum limit of LQC

Unique family of consistent histories in the Caldeira-Leggett model

Unique Fock quantization of scalar cosmological perturbations

Uniqueness and Non-uniqueness in the Einstein Constraints

Uniqueness and Self-Conjugacy of Dirac Hamiltonians in arbitrary Gravitational Fields

Uniqueness of collinear solutions for the relativistic three-body problem

Uniqueness of de Sitter space

Uniqueness of diffeomorphism invariant states on holonomy-flux algebras