Quantum effects in gravitational wave signals from cuspy superstrings

Details Quantum effects in gravitational wave signals from cuspy superstrings Quantum effects in gravitational wave signals from cuspy superstrings

2006-06-22

arxiv.org/abs/hep-th/0606226v1

JCAP0608:003,2006

Physics

High Energy Physics

High Energy Physics - Theory

16 pages, no figure

Scientific paper

10.1088/1475-7516/2006/08/003

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 wave detector using matched filtering and located in the special null direction associated to the cusp. We study the quantum statistics (expectation value and variance) of the measured filtered signal and find that it is very sharply peaked around the classical prediction. Ultimately, this result follows from the fact that the detector is a low-pass filter which is blind to the violent high-frequency quantum fluctuations of both the string worldsheet, and the incoming gravitational field.

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