Rainer Weiss

Rainer Weiss is an American physicist who developed laser interferometry for gravitational-wave detection and shared the 2017 Nobel Prize in Physics for LIGO’s discoveries.

Kip Thorne: An American theoretical physicist whose work on gravitation helped establish the scientific case for gravitational-wave astronomy. Thorne and Weiss shared the 2017 Nobel Prize for contributions to LIGO.
Michelson interferometer: An optical instrument that compares light traveling along two paths by recombining the beams. Weiss adapted this layout to detect differential changes in LIGO’s perpendicular arms.
LIGO: The Laser Interferometer Gravitational-Wave Observatory, a pair of U.S. facilities built to detect gravitational waves. Weiss’s instrument concept became the foundation of LIGO’s detectors.
Massachusetts Institute of Technology: A research university in Cambridge, Massachusetts, where Weiss spent most of his academic career. Weiss developed and taught the detector concepts that led to LIGO at MIT.
Barry Barish: An American physicist who led LIGO’s transformation into a large-scale international observatory. Barish shared the 2017 Nobel Prize with Weiss and Thorne.
Laser interferometric gravitational-wave detector: A detector that uses laser interference to measure tiny changes in the relative lengths of distant optical paths. This is the measurement architecture Weiss developed for gravitational-wave astronomy.
GW150914: The first directly detected gravitational-wave signal, observed by LIGO on September 14, 2015. This signal demonstrated the astronomical reach of the detector Weiss had helped develop.
Gravitational-wave detection: The experimental measurement of gravitational waves using instruments sensitive to spacetime distortions. Weiss’s career centered on making this difficult measurement technically feasible.
Ronald Drever: A Scottish experimental physicist whose innovations in laser interferometry shaped gravitational-wave detector design. Drever’s detector techniques became part of the experimental lineage Weiss helped advance.
Fabry–Pérot interferometer: An optical cavity formed by two partially reflecting mirrors, allowing light to make repeated passes. LIGO’s arm cavities increase the effective distance over which a gravitational wave shifts the light.

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