We will prepare for, carry out, and report on a search for burst-like events of gravitational wave origin in data to be collected in an Engineering Run that will have coincident data from operating interferometers at both Hanford and Livingston (hereinafter referred to as the Science Analysis Challenge or SAC). By “burst-like events” (hereinafter “bursts”) we refer in the most general sense to ...

Gravitational waves are propagating fluctuations of gravitational fields, that is, ”ripples” in spacetime, generated mainly by moving massive bodies. These distortions of spacetime travel with the speed of light. Every body in the path of such a wave feels a tidal gravitational force that acts perpendicular to the waves direction of propagation; these forces change the distance between points, ...

The sources of gravitational radiation that seem to be most likely to be detected by planned groundand space-based gravitational-wave detectors are reviewed, with particular attention to the likely information that observations of them will reveal. A particular emphasis is placed on observations by LISA, the fundamental-physics Cornerstone project of the European Space Agency’s Horizon 2000+ pr...

The subject of gravitational wave astronomy has had a certain amount of controversy associated with it, but it is developing fairly rapidly. Indeed certain aspects of the field have reached an exciting stage, although they have not produced any real astronomical data yet and may not do so for some time. In some ways there have been quite basic changes in the overall character of the field in th...

An overview is presented of possible cosmologically distant sources of gravitational wave backgrounds, especially those which might produce detectable backgrounds in the LISA band between 0.1 and 100 mHz. Examples considered here include inflation-amplified vacuum fluctuations in inflaton and graviton fields, bubble collisions in first-order phase transitions, Goldstone modes of classical self-...

There are several common conventions in use by the gravitational-wave community to describe the amplitude of sources and the sensitivity of detectors. These are frequently confused. We outline the merits of and differences between the various quantities used for parameterizing noise curves and characterizing gravitational-wave amplitudes. We conclude by producing plots that consistently compare...

Resonant bar gravitational wave detectors have improved greatly over the last 40 years but are currently completely outperformed by laser interferometer detectors. Spherical detector configuration has several advantages over conventional bar detectors and can be considered as the next generation of resonant gravitational wave antenna. In this report, I will give a brief introduction to gravitat...

We nd an exact pp{gravitational wave solution of the fourth order gravity eld equations. The sourceless version of it is not a vacuum solution of General Relativity. It represents the contribution of the massive, m = (?) ?1=2 , spin{ two eld associated to the Ricci squared term in the gravitational Lagrangian. We generalize this analysis to D{dimensions, extended sources, and higher than fourth...

uncertainty from having a discrete spacetime has been reduced by a factor of three. This correspondingly reduces the error on extrapolating from the unphysical lattice world to the real world. Until now, this uncertainty has been a problem for the charm quark because its relatively large mass gives it a shortwavelength quantum field that can ‘see’ the lattice spacing. This improvement also help...