Universality of the self gravitational potential energy of any fundamental particle

Universe creation on a computer

Universe Without Singularities. A Group Approach to De Sitter Cosmology

Universes with and without a center

Unless Connected to Relativity the First and Second Laws of Thermodynamics are Incompatible

Unphysical Gauge Fixing in Higgs Mechanism

Unravelling Lorentz Covariance and the Spacetime Formalism

Unravelling the Dark Matter - Dark Energy Paradigm

Unreduced Dynamic Complexity: Towards the Unified Science of Intelligent Communication Networks and Software

Unsuitability of the moving light clock system for the Lorentz factor derivation

Unusual formations of the free electromagnetic field in vacuum

Upper limit of the energy of the photon and the phase change of photon to material particles at the Scwartzschild radius

Uranio impoverito: perché? (Depleted uranium: why?)

Use of a physical metric for OPERA experiment

Use of generalized population ratios to obtain Fe XV line intensities and linewidths at high electron densities

Use of Gödel Universe to Construct A New Zollfrei Metric with $R^2 \times S^1$ Topology

Use of nuclei fractal properties for help to determine some unknown particle spins and unknown nuclei excited level spins

Use of relativistic hadronic mechanics for the exact representation of nuclear magnetic moments and the prediction of new recycling of nuclear waste

Using a Kinematic Definition of the Hubble Parameter to Determine the Cosmological Constant Λ = 0 in a Balanced Universe

Using ordinary multiplication to do relativistic velocity addition