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

Publication

1.
Julian Westerweck, Alex B. Nielsen, Ofek Fischer-Birnholtz, Miriam Cabero, Collin Capano, Thomas Dent, Badri Krishnan, Grant Meadors, and Alexander H. Nitz
Low significance of evidence for black hole echoes in gravitational wave data

Do black hole mergers produce gravitational-wave echoes?

AEI researchers search for echoes after black hole mergers

15. Juni 2018

AEI researchers have analysed claims of evidence for repeating echo signals following the gravitational-wave signals of the binary black hole merger events recorded in LIGO's first observation run O1. They find a reduced statistical significance for these claims.
Echo signal as expected for GW150914 based on a simple model. The delay between echoes is on the order of tenths of a second. The form of the echoes depends on several parameters, e.g. the dampening factor chosen as 0.7 here. Bild vergrößern
Echo signal as expected for GW150914 based on a simple model. The delay between echoes is on the order of tenths of a second. The form of the echoes depends on several parameters, e.g. the dampening factor chosen as 0.7 here. [weniger]

Paper abstract

Recent detections of merging black holes allow observational tests of the nature of these objects. In some proposed models, nontrivial structure at or near the black hole horizon could lead to echo signals in gravitational wave data. Recently, Abedi-Dykaar-Afshordi (ADA) claimed tentative evidence for repeating damped echo signals following the gravitational-wave signals of the binary black hole merger events recorded in the first observational period of the Advanced LIGO interferometers. We reanalyze the same data, addressing some of the shortcomings of their method using more background data and a modified procedure. We find a reduced statistical significance for the claims of evidence for echoes, calculating increased p-values for the null hypothesis of echo-free noise. The reduced significance is entirely consistent with noise, and so we conclude that the analysis of Abedi et al. does not provide any observational evidence for the existence of Planck-scale structure at black hole horizons.

 
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