U Duality, Solvable Lie Algebras and Extremal Black-Holes

U(1) Charges and Moduli in the D1-D5 System

U(1) Connection, Nonlinear Dirac-like Equations and Seiberg-Witten Equations

U(1) effective confinement theory from SU(2) restricted gauge theory via the Julia-Toulouse Approach

U(1) Field Theory in the Limit of a Large Coupling Constant

U(1) Gauge Field of the Kaluza-Klein Theory in the Presence of Branes

U(1) gauge field theory on kappa-Minkowski space

U(1) gauge invariance from open string field theory

U(1) gauge invariant noncommutative Schrödinger theory and gravity

U(1) gauge theory over discrete space-time and phase transitions

U(1) Instantons on AdS_4 and the Uplift to Exact Supergravity Solutions

U(1) Invariant F(R) Horava-Lifshitz Gravity

U(1) invariant Membranes and Singularities

U(1) lattice gauge theory and N=2 supersymmetric Yang-Mills theory

U(1) Mediation of Flux Supersymmetry Breaking

U(1) Noncommutative Gauge Fields and Magnetogenesis

U(1) symmetry and elimination of spin-0 gravitons in Horava-Lifshitz gravity without the projectability condition

U(1) x U(1) Quaternionic Metrics from Harmonic Superspace

U(1)-decoupling, KK and BCJ relations in $\mathcal{N}=4$ SYM

U(1)-invariant membranes: the geometric formulation, Abel and pendulum differential equations