Overview
- LIGO recorded the signal GW231123 from a black‑hole merger on Nov. 23, 2023, and initial analyses implied component masses near 140 and 100 times the Sun, a result that strained standard stellar‑evolution models.
- A peer‑reviewed paper published Aug. 25, 2026, presents lensing models and fast analysis software showing that magnification and wave effects can make the merger look heavier than it really was.
- The team finds that a compact lens of about 190–850 solar masses or an extended structure such as a globular cluster can reproduce the observed signal while lowering the system mass to roughly 140 solar masses.
- The identity and origin of the putative lens remain unknown, and individual lenses in the 100–1,000 solar‑mass range are expected to be very rare, so the lensing interpretation is provisional.
- Confirming lensed gravitational waves will require more candidate detections, refined statistical tests for interference and magnification signatures, and improved detector sensitivity in future LIGO upgrades.