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