Ultimate Fate of our Universe from Quantum Mechanics

Ultra High Energy Behaviour

Ultra High Energy Cosmic Rays from decays of Holeums in Galactic Halos

Ultra High Energy Fermions

Ultra High Energy Particles

Ultradense Deuterium

Ultrarelativistic waves in overdense electron-positron plasmas

Ultrasonic imaging with limited-diffraction beams

Ultraviolet-Finite QFT on Curved Space-Times

Un nouveau regard sur le monde physique

Un Resultat Gravimetrique pour la Renaissance de la Theorie Corpusculaire "An Experimental Gravimetric Result for the Revival of Corpuscular Theory"

Un-renormalized Classical Electromagnetism

Unconditionally secure computers, algorithms and hardware, such as memories, processors, keyboards, flash and hard drives

Unconditionally secure quantum bit commitment is simply possible

Unconventional Logic Elements on the Base of Topologically Modulated Signals

Underpinning the universe: its scales, holography and fractality

Unexplored Aspect of Velocity of light

Unfaithful embedding of causal sets

Unfamiliar trajectories for a relativistic particle in a Kepler or Coulomb potential

Unification By Induction