Quieting the mirrors that listen to space
Researchers developed Deep Loop Shaping, a reinforcement-learning feedback controller tested on the LIGO Livingston Observatory to reduce control noise in a difficult mirror-control loop.
- Maturity
- Demonstrated, stage 3 of 4
- Support
- 1 source · institution
- Evidence detail
- How we know ↓
Tiny vibrations can obscure the faint gravitational-wave signals that observatories are built to measure.
Traditional feedback control must keep LIGO's mirrors stable without injecting more vibration into the observation band.
A reinforcement-learning policy was trained with frequency-domain rewards to suppress control noise while stabilizing the mirror system.
What was shown, and what wasn’t
Shown
The researchers report 30- to 100-fold lower injected control noise than existing controllers in the difficult loop, plus stable repeated operation on the real Livingston hardware.
Not shown · limits
- The projected benefit of hundreds more events per year depends on applying the method across all LIGO mirror-control loops.
- That full-observatory outcome has not been demonstrated in the cited result.
Bright editorial interpretation
Reducing a source of instrument noise may allow scientists to measure fainter or more distant gravitational-wave events.
Still open
How does the controller perform when extended across the whole mirror-control system?
Can it improve observing yield and inform future ground- and space-based observatories?
How we know1 source · checked 2026-09-07 · no corrections
Original sources
- Using AI to perceive the universe in greater depth ↗ · institution
Institutions: Google DeepMind · LIGO · Caltech · Gran Sasso Science Institute
- Maturity
- Demonstrated
- Source published
- 2025-09-04
- Captured
- 2026-09-07
- Last source review
- 2026-09-07
- Editorial method
- AI-assisted source review
Bright compared this account with the linked original and supporting sources and kept reported, budgeted, projected, and observed claims distinct. Bright did not independently audit the underlying records.
Maturity describes the tested or operational setting. Confidence describes support for the particular claim; one does not determine the other.
Revision & correction history
2026-09-07 · Reducing a source of instrument noise may allow scientists to measure fainter or more distant gravitational-wave events.
No corrections recorded.