Abstract We study the gravitational emission, in Superstring Theory, from fundamental strings exhibiting cusps. The classical computation of the gravitational radiation signal from cuspy strings features strong bursts in the special null directions associated to the cusps. We perform a quantum computation of the gravitational radiation signal from a cuspy string, as measured in a gravitational ...

The output power of a cw Nd:YAG laser was stabilized in a dc-coupled feedback loop with a low-noise multiphotodiode detector and an electro-optic amplitude modulator in the frequency band from 1 Hz to 1 kHz. For the first time, to our knowledge, an independently measured relative power noise of 2.4 x 10(-9) Hz(-1/2) at 10 Hz was achieved, fulfilling the power stability requirements of the Advan...

There has been a rapid advance in the sensitivity of broadband searches for gravitational waves, using an international network of kilometer-scale laser interferometers. The LIGO detectors in North America, the GEO600 detector in Germany and the TAMA300 detector in Japan have conducted searches for gravitational waves covering a frequency range from below 100 Hz up to many kHz. These detectors ...

Gravitational interaction is considered with use of the universal charge. Gravitational wave is defined as a tenzor electromagnetic like wave of the Planck mass. Within the Planck time it decays into four hypothetical Planck neutrinos. The quadrupole gravitational emission in the theory with the universal charge is the same as in general relativity. Gravitational radiation as Planck neutrinos d...

The first kilometer-scale gravitational wave observatories, LIGO [1] and VIRGO [2], are expected to begin performing searches for astrophysical sources of gravitational waves in the year 2002. By this time, it will be necessary to have data analysis software for on-line searches. Because the anticipated signals are expected to be weak, near-optimal strategies for data analysis will be required ...

For the last fifteen years, the limiting noise source at the low frequency end of the sensitivity window for space gravitational wave detectors has been expected to be the confusion background of overlapping galactic binary stars. Here, we present results of a study that investigates the correlation between binary star signals and conclude that there is a spatial filter in the position-dependen...

We analyze the signal processing required for the optimal detection of a stochastic background of gravitational radiation using laser interferometric detectors. Starting with basic assumptions about the statistical properties of a stochastic gravity-wave background, we derive expressions for the optimal filter function and signal-to-noise ratio for the cross-correlation of the outputs of two gr...

Galaxy clusters, the largest gravitationally bound objects in the universe, form over time from collisions and mergers between clusters and between clusters and smaller galaxy groups. The results of these collisions can be detected in a variety of ways. In one case, I have found that clusters which have recently undergone a merger will have an enhanced Sunyaev-Zel’dovich (SZ) Effect. The SZ sig...