Update on an Electromagnetic Basis for Inertia, Gravitation, the Principle of Equivalence, Spin and Particle Mass Ratios

Update on Cosmic Censorship Violation in AdS

Update on gravitational-wave research

Upgraded VIRGO detector(s) and stochastic gravitational waves backgrounds

Upper and lower limits on the Crab pulsar's astrophysical parameters set from gravitational wave observations by LIGO: braking index and energy considerations

Upper bound for entropy in asymptotically de Sitter space-time

Upper Limit on Gravitational Wave Backgrounds at 0.2 Hz with Torsion-bar Antenna

Upper limits based on "loudest" events

Upper limits from the LIGO and TAMA detectors on the rate of gravitational-wave bursts

Upper limits on a stochastic gravitational-wave background using LIGO and Virgo interferometers at 600-1000 Hz

Upper limits on gravitational wave bursts in LIGO's second science run

Upper limits on gravitational wave emission from 78 radio pulsars

Upper limits on gravitational-wave signals based on loudest events

Upper limits on stray force noise for LISA

Upper limits on the gravitational mass loss of the Galaxy and the LIGO burst searches

Upper limits on the strength of periodic gravitational waves from PSR J1939+2134

Upper limits to surface force disturbances on LISA proof masses and the possibility of observing galactic binaries

Use and Abuse of the Fisher Information Matrix in the Assessment of Gravitational-Wave Parameter-Estimation Prospects

Use and Abuse of the Model Waveform Accuracy Standards

Use of the MultiNest algorithm for gravitational wave data analysis