Hydrological signals in tilt and gravity residuals at Conrad Observatory (Austria)

Tip-tilt mirror suspension: beam steering for advanced laser interferometer gravitational wave observatory sensing and control signals.

We describe the design of a small optic suspension system, referred to as the tip-tilt mirror suspension, used to isolate selected small optics for the interferometer sensing and control beams in the advanced LIGO gravitational wave detectors. The suspended optics are isolated in all 6 degrees of freedom, with eigenmode frequencies between 1.3 Hz and 10 Hz. The suspended optic has voice-coil ac...

Evaluating catchment-scale hydrological modeling by means of terrestrial gravity observations

[1] In a previous study (Hasan et al., 2006) we applied time series analysis and distributed hydrological modeling techniques to investigate the effect of hydrological processes on observed terrestrial gravity residuals. In this study we apply terrestrial gravity observations (measured in one location) to constrain simple hydrological models in a catchment around the gravimeter. A superconducti...

Nonsymmetric Gravity and Noncommutative Signals *

Models in which the space-time metric g µν is not symmetric, i.e. g µν = g νµ may make predictions in scattering experiments, for example in a future e + e − linear collider, similar to those from noncommutative field theory. We compute the differential cross sections for pair annihilation , Bhabha and Møller scattering and find that both nonsymmetric gravity theory(NGT) and noncommutative fiel...

Ocean tidal signals in observatory and satellite magnetic measurements

[1] Ocean flow moves sea water through the Earth’s magnetic field, inducing electric fields, currents and secondary magnetic fields. These motionally induced magnetic fields have a potential for the remote sensing of ocean flow variability. A first goal must be to gain a better understanding of magnetic field generation by tidal ocean flow. We predict the motionally induced magnetic fields for ...

Estimating Protectionism through Residuals from the Gravity Model