期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 11, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2019/11/010
关键词
GR black holes; gravitational waves / experiments; quantum black holes; gravity
资金
- University of Waterloo
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Institute for Research in Fundamental Sciences (IPM)
- Perimeter Institute for Theoretical Physics
- Government of Canada through Industry Canada
- Province of Ontario through the Ministry of Research and Innovation
The first direct observation of a binary neutron star (BNS) merger was a watershed moment in multi-messenger astronomy. However, gravitational waves from GW170817 have only been observed prior to the BNS merger, but electromagnetic observations all follow the merger event. While post-merger gravitational wave signal in general relativity is too faint (given current detector sensitivities), here we present the first tentative detection of post-merger gravitational wave echoes from a highly spinning black hole remnant. The echoes may be expected in different models of quantum black holes that replace event horizons by exotic Planck-scale structure and tentative evidence for them has been found in binary black hole merger events. The fact that the echo frequency is suppressed by log M (in Planck units) puts it squarely in the LIGO sensitivity window, allowing us to build an optimal model-agnostic search strategy via cross-correlating the two detectors in frequency/time. We find a tentative detection of echoes at f(echo) similar or equal to 72 Hz, around 1.0 sec after the BNS merger, consistent with a 2.60-2.7 M-circle dot black hole remnant with dimensionless spin 0.84-0.87. Accounting for all the look-elsewhere effects, we find a significance of 4.2 sigma, or a false alarm probability of 1.6 x 10(-5), i.e. a similar cross-correlation within the expected frequency/time window after the merger cannot be found more than 4 times in 3 days. If confirmed, this finding will have significant consequences for both physics of quantum black holes and astrophysics of binary neutron star mergers.
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