Robust statistics for deterministic and stochastic gravitational waves in non-Gaussian noise. II: Bayesian analyses

Details Robust statistics for deterministic and stochastic gravitational waves in non-Gaussian noise. II: Bayesian analyses Robust statistics for deterministic and stochastic gravitational waves in non-Gaussian noise. II: Bayesian analyses

2002-05-03

arxiv.org/abs/gr-qc/0205015v1

Phys.Rev. D67 (2003) 122002

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

revtex, 13 pages, no figures

Scientific paper

10.1103/PhysRevD.67.122002

In a previous paper (gr-qc/0105100) we derived a set of near-optimal signal detection techniques for gravitational wave detectors whose noise probability distributions contain non-Gaussian tails. The methods modify standard methods by truncating sample values which lie in those non-Gaussian tails. The methods were derived, in the frequentist framework, by minimizing false alarm probabilities at fixed false detection probability in weak signal limit. For stochastic signals, the resulting statistic consisted of a sum of an auto-correlation term and a cross-correlation term; it was necessary to discard by hand the auto-correlation term to obtain the correct, generalized cross-correlation statistic. In the present paper, we present an alternative Bayesian derivation of the same signal detection techniques. We compute the probability that a signal is present in the data, in the limit where the signal-to-noise ratio squared per frequency bin is small, where the integrated signal-to-noise ratio is large compared to one, and where the total probability in the non-Gaussian tail part of the noise distribution is small. We show that, for each model considered, the resulting probability is to a good approximation a monotonic function of the detection statistic derived in the previous paper. Moreover, for stochastic signals, the new Bayesian derivation automatically eliminates the problematic auto-correlation term.

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