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3 October 2017

The Royal Swedish Academy of Sciences has decided to award the Nobel Prize in Physics 2017 with one half to

Rainer Weiss
LIGO/VIRGO Collaboration

and the other half jointly to

Barry C. Barish
LIGO/VIRGO Collaboration

and

Kip S. Thorne
LIGO/VIRGO Collaboration

“for decisive contributions to the LIGO detector and the observation of gravitational waves”

Gravitational waves finally captured

On 14 September 2015, the universe’s gravitational waves were observed for the very first time. The waves, which were predicted by Albert Einstein a hundred years ago, came from a collision between two black holes. It took 1.3 billion years for the waves to arrive at the LIGO detector in the USA.

The signal was extremely weak when it reached Earth, but is already promising a revolution in astrophysics. Gravitational waves are an entirely new way of observing the most violent events in space and testing the limits of our knowledge.

LIGO, the Laser Interferometer Gravitational-Wave Observatory, is a collaborative project with over one thousand researchers from more than twenty countries. Together, they have realised a vision that is almost fifty years old. The 2017 Nobel Laureates have, with their enthusiasm and determination, each been invaluable to the success of LIGO. Pioneers Rainer Weiss and Kip S. Thorne, together with Barry C. Barish, the scientist and leader who brought the project to completion, ensured that four decades of effort led to gravitational waves finally being observed.

In the mid-1970s, Rainer Weiss had already analysed possible sources of background noise that would disturb measurements, and had also designed a detector, a laser-based interferometer, which would overcome this noise. Early on, both Kip Thorne and Rainer Weiss were firmly convinced that gravitational waves could be detected and bring about a revolution in our knowledge of the universe.

Gravitational waves spread at the speed of light, filling the universe, as Albert Einstein described in his general theory of relativity. They are always created when a mass accelerates, like when an ice-skater pirouettes or a pair of black holes rotate around each other. Einstein was convinced it would never be possible to measure them. The LIGO project’s achievement was using a pair of gigantic laser interferometers to measure a change thousands of times smaller than an atomic nucleus, as the gravitational wave passed the Earth.

So far all sorts of electromagnetic radiation and particles, such as cosmic rays or neutrinos, have been used to explore the universe. However, gravitational waves are direct testimony to disruptions in spacetime itself. This is something completely new and different, opening up unseen worlds. A wealth of discoveries awaits those who succeed in capturing the waves and interpreting their message.

Read more about this year’s prize

Popular Science Background
Pdf 1.7 MB

Scientific Background
Pdf 2.2 MB

Image – Gravitational waves (pdf 162 kB)
Image – Two black holes (pdf 508 kB)
Image – LIGO (pdf 1.7 MB)
Image – LIGO in the USA (pdf 1.6 MB)

All illustrations: Copyright © Johan Jarnestad/The Royal Swedish Academy of Sciences

Rainer Weiss, born 1932 in Berlin, Germany. Ph.D. 1962 from Massachusetts Institute of Technology, MIT, Cambridge, MA, USA. Professor of Physics, Massachusetts Institute of Technology, MIT, Cambridge, MA, USA.
http://web.mit.edu/physics/people/faculty/weiss_rainer.html B

Barry C. Barish, born 1936 in Omaha, NE, USA. Ph.D. 1962 from University of California, Berkeley, CA, USA. Linde Professor of Physics, California Institute of Technology, Pasadena, CA, USA
https://labcit.ligo.caltech.edu/~BCBAct/ K

Kip S. Thorne, born 1940 in Logan, UT, USA. Ph.D. 1965 from Princeton University, NJ, USA. Feynman Professor of Theoretical Physics, California Institute of Technology, Pasadena, CA, USA
https://www.its.caltech.edu/~kip/index.html/

LIGO/VIRGO COLLABORATION
www.ligo.org

Prize amount: 9 million Swedish krona.
Further information: www.kva.se and http://nobelprize.org
Press contact: Jessica Balksjö Nannini, Press Officer, Phone +46 8 673 95 44, +46 70 673 96 50, [email protected]
Experts: Olga Botner, member of the Nobel Committee for Physics, Phone +46 73-390 86 50, [email protected],
Ulf Danielsson, member of the Nobel Committee for Physics, Phone +46 70-314 10 86, [email protected]

The Royal Swedish Academy of Sciences, founded in 1739, is an independent organisation whose overall objective is to promote the sciences and strengthen their influence in society. The Academy takes special responsibility for the natural sciences and mathematics, but endeavours to promote the exchange of ideas between various disciplines.

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