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Dr.  Benjamin  Knispel
Dr. Benjamin Knispel
Press Officer AEI Hannover
Phone:+49 511 762-19104Fax:+49 511 762-17182

Publication

1.
Alex B. Nielsen, Alexander H. Nitz, Collin D. Capano, and Duncan A. Brown
Investigating the noise residuals around the gravitational wave event GW150914

Investigating the noise residuals around GW150914

Are there statistically significant noise correlations between the LIGO detectors at the time of GW150914?

November 09, 2018

Team of AEI researchers reviews claimed statistically significant noise correlations between the LIGO Hanford and Livingston detectors at the time of the binary black hole merger GW150914 and finds they do not exist.
Correlations between the Hanford and Livingston data using the original LIGO data, subtraction of a non-maximum-likelihood waveform, and subtraction of a maximum-likelihood waveform. Zoom Image
Correlations between the Hanford and Livingston data using the original LIGO data, subtraction of a non-maximum-likelihood waveform, and subtraction of a maximum-likelihood waveform. [less]

Paper abstract

We use the Pearson cross-correlation statistic proposed by Liu and Jackson, and employed by Creswell et al., to look for statistically significant correlations between the LIGO Hanford and Livingston detectors at the time of the binary black hole merger GW150914. We compute this statistic for the calibrated strain data released by LIGO, using both the residuals provided by LIGO and using our own subtraction of a maximum-likelihood waveform that is constructed to model binary black hole mergers in general relativity. To assign a significance to the values obtained, we calculate the cross-correlation of both simulated Gaussian noise and data from the LIGO detectors at times during which no detection of gravitational waves has been claimed. We find that after subtracting the maximum likelihood waveform there are no statistically significant correlations between the residuals of the two detectors at the time of GW150914.

 
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