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Research dossier · version 1 · updated Oct 30, 2026

Gravitational-Wave Astronomy: State of the Field (October 2026)

Covers ground-based compact-binary catalogues from LIGO, Virgo and KAGRA, massive binary black holes including GW231123, the multimessenger neutron-star merger GW170817, the nanohertz background seen by pulsar timing arrays, and tests of general relativity. The main takeaway: more than 200 compact-binary candidates are now catalogued, while the nanohertz background is reported at moderate significance and its source is still unidentified.

3,218 words63 sources27 evidence-mapped claims10 benchmarks19 timeline events✓ citation-verified Oct 30, 2026

AI-assisted synthesis of the cited literature, independently fact-checked against its sources; not peer reviewed.

Contents

  1. Executive summary
  2. Background and core concepts
  3. Timeline of key milestones
  4. State of the art
  5. Catalogues and the compact-binary population
  6. Heavy and unusual compact objects
  7. Neutron-star mergers and multimessenger astronomy
  8. Pulsar timing arrays
  9. Tests of general relativity and horizon physics
  10. Quantitative benchmarks
  11. Open problems and active debates
  12. Major programs and players
  13. Outlook: what to watch (next 12-18 months)
  14. Key papers
  15. Glossary

Sample findings

  • GW150914 had a peak strain of about 1.0 × 10^-21, and its signal rose from roughly 35 to 250 Hz.
  • The GW150914 signal matched the general-relativistic waveform for the inspiral, merger and ringdown phases.
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