An improved version of the " optical bar " intracavity readout scheme for gravitational-wave antennae is considered. We propose to call this scheme " optical lever " because it can provide significant gain in the signal displacement of the local mirror similar to the gain which can be obtained using ordinary mechanical lever with unequal arms. In this scheme displacement of the local mirror can...

We consider a simulated population of isolated Galactic neutron stars. The rotational frequency of each neutron star evolves through a combination of electromagnetic and gravitational wave emission. The magnetic field strength dictates the dipolar emission, and the ellipticity (a measure of a neutron star’s deformation) dictates the gravitational wave emission. Through both analytic and numeric...

There is an extremely simple relationship between the spectrum of the gravitational wave background produced by a cosmological distribution of discrete gravitational wave sources, the total time-integrated energy spectrum of an individual source, and the present-day comoving number density of remnants. Stated in this way, the background is entirely independent of the cosmology, and only weakly ...

Ulrich Sperhake, Bernard Kelly, 2 Pablo Laguna, 3 Kenneth L. Smith, and Erik Schnetter Center for Gravitational Wave Physics, Penn State University, University Park, PA 16802 Center for Gravitational Wave Astronomy, University of Texas at Brownsville, Brownsville, TX 78520 Institute for Gravitational Physics & Geometry Departments of Astronomy & Astrophysics and Physics Penn State University, U...

We calculate how accurately parameters of the short-period binaries (10 Hz . f . 10 Hz) will be determined from the gravitational waves by LISA. In our analysis the chirp signal ḟ is newly included as a fitting parameters and dependence on observational period or wave frequency is studied in detail. Implications for gravitational wave astronomy are also discussed quantitatively. Subject heading...

A possible wave effect in the gravitational lensing phenomenon is discussed. We consider the interference of two coherent gravitational waves of slightly different frequencies from a compact binary, due to the gravitational lensing by a galaxy halo. This system shows the modulation of the wave amplitude. The lensing probability of such the phenomenon is of order 10 for a high-z source, but it m...

The LIGO gravitational wave detectors have recently reached their design sensitivity and finished a two-year science run. During this period one year of data with unprecedented sensitivity has been collected. I will briefly describe the status of the LIGO detectors and the overall quality of the most recent science run. I also will present results of a search for inspiral waveforms in gravitati...

We report on a search for gravitational wave bursts in data from the three LIGO interferometric detectors during their third science run. The search targets subsecond bursts in the frequency range 100–1100 Hz for which no waveform model is assumed, and has a sensitivity in terms of the root-sum-square (rss) strain amplitude of hrss ∼ 10 Hz. No gravitational wave signals were detected in the 8 d...

We report on a search for gravitational wave bursts in data from the three LIGO interferometric detectors during their third science run. The search targets subsecond bursts in the frequency range 100–1100 Hz for which no waveform model is assumed, and has a sensitivity in terms of the root-sum-square (rss) strain amplitude of hrss ∼ 10 Hz. No gravitational wave signals were detected in the 8 d...