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General-relativistic precession in a black-hole binary.

Mark Hannam1, Charlie Hoy2, Jonathan E Thompson2

  • 1Gravity Exploration Institute, Cardiff University, Cardiff, UK. hannammd@cardiff.ac.uk.

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This summary is machine-generated.

Scientists observed spin-induced orbital precession in strong-field gravity for the first time using the gravitational-wave signal GW200129. This finding challenges current binary black hole formation models.

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Area of Science:

  • Astrophysics
  • General Relativity
  • Gravitational Wave Astronomy

Background:

  • Spin-induced orbital precession is a key prediction of general relativity in strong gravity.
  • Previous searches for this phenomenon in binary black hole (BBH) mergers have been inconclusive.
  • Astrophysical BBH populations are expected to include precessing binaries, but definitive observational evidence has been lacking.

Purpose of the Study:

  • To report the first measurement of strong-field orbital precession in a BBH system.
  • To investigate the properties of the primary black hole, specifically its spin.

Main Methods:

  • Analysis of the gravitational-wave signal GW200129 from the LIGO-Virgo-Kagra detectors.
  • Utilizing advanced signal processing techniques to identify precession signatures.

Main Results:

  • Direct detection of spin-induced orbital precession in the GW200129 signal.
  • The observed precession rate is ten orders of magnitude faster than previously measured in weak-field systems.
  • Evidence suggests the primary black hole in GW200129 possesses a high spin.

Conclusions:

  • This observation provides the first direct evidence of strong-field orbital precession.
  • The characteristics of GW200129 are statistically unlikely within current BBH population models.
  • The findings necessitate a re-evaluation of existing binary formation and evolution theories.