Archive for arXiv:1811.04071

Gravitational Wave Controversy Updates

Posted in The Universe and Stuff with tags , , , on November 14, 2018 by telescoper

Following my recent post about the claims and counter-claims concerning the detection (or otherwise) of gravitational waves, I have a couple of updates.

First, a few days ago there appeared a paper on the arXiv by Nielsen et al with the abstract (which I’ve slightly edited for formatting reasons):

We use the Pearson cross-correlation statistic proposed by Liu & Jackson (2016), and employed by Creswell et al. (2017), 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.

The four authors of this paper are, I believe, either present or former members of the LIGO Collaboration

Meanwhile, the NBI group behind the Cresswell et al. paper challenged by the above paper has issued a statement which you can read here. The group re-iterate points made in the New Scientist article discussed in my recent post. Although the Nielsen et al. paper is not explicitly mentioned in the NBI statement but I’m given to understand that the Danish group does not agree with the conclusions in that paper.

The story continues.