Cosmologists have questioned the discovery of gravitational waves
Some cosmologists and physicists have questioned the discovery of gravitational waves gravitational Observatory LIGO, finding an unusual “synchronization noise” in the data from two detectors of this scientific instrument, said in an article posted in the electronic library arXiv.org
“I tried to reproduce what writing colleagues in this article. I was not able to do because, I think, are errors in the “purged” data. Even if these anomalies were present in our data, this does not refute the opening splash GW150914 not have effect on its statistical reliability. However, I now contacted the authors of this statement, and together we are trying to understand the nature of these differences,” said Ian Harry (Ian Harry), of the Institute for gravitational physics in Potsdam (Germany), one of the participants of the collaboration LIGO.
In September 2015, in fact, immediately after switching on the upgraded LIGO, scientists detected a burst of gravitational waves generated by merging black holes with total mass 65 Suns. Subsequently, LIGO recorded two bursts of gravitational waves, only one of which was officially recognized by the scientific community. Another surge was found in January this year, after the start of the second stage of the detector.
Paul Nasielski, Russian-Danish physicist from the Niels Bohr Institute in Copenhagen, and a number of other scientists re-analyzed data collected by the two LIGO detectors during the detection of the first outbreaks of gravitational waves, and detected an unusual anomaly that made them think that all the discoveries of LIGO can be the result of error.
Naselsky and his team drew attention not to the signal generated by black holes, and noises that are generated by quantum fluctuations of the vacuum and other random processes and special calibration systems, which are used to synchronize the “halves” of LIGO.
As scholars have noted, the noise they were interested in for the reason that the random synchronization of noise in fact, and in another detector over a long period of time can generate a signal similar to gravitational waves, which would be virtually impossible to distinguish from the real, if we analyze only the signal, not all the data.
For searches similar coincidences and anomalies Danish physics downloaded LIGO observations, “deleted” four of them known to us the burst of gravitational waves, and tried to find a similar coincidence in the level of noise in the data and from that, and from another detector of the Observatory.
According to them, “synchronization of noise” has occurred and when the event is GW150914 in September 2015 and in a recent event GW170104. It is, in their opinion, significantly reduces the likelihood that LIGO actually managed to detect merging black holes.
Harry, in turn, believes that there are errors in the calculations Naselennogo and his colleagues. According to him, they used the method of “cleaning” of the signal itself generates a similar correlation. As the scientist, if you apply methodology of the Danish physicists for analyzing completely random data set, we get the same picture as in the analysis of the results of observations using LIGO, which refutes the calculations of the authors.
Moreover, according to the representative of LIGO, the signal can be seen in the data of both detector to the naked eye, not by comparing it with information from the second “half” of the Observatory and not cleaning it. All this, in his opinion, suggests that Naselsky and his team are wrong – even if those “sync” in the noise existed, they would not be able to boost the signal or to artificially generate it.
Ľuboš Motl, Czech theoretical physicist and former Professor at Harvard, articulates similar thoughts – his calculations are built on the basis of LIGO data show that gravitational waves have been clearly detected in September 2015, and that mistakes and coincidences can not be here.
In his opinion, the only mistake the team LIGO may be that they do not consider how the polarization of gravitational waves may affect the operation of the detectors of the Observatory. Ignoring this factor, according to Matla, will produce small discrepancies between simulated mergers of black holes and the data received when LIGO observations of three such events.