Monday 16 July 2018

Ripple of applause for Einstein as trio land Nobel Prize for work on his theory

Kip Thorne, one of the joint winners of the physics prize
Kip Thorne, one of the joint winners of the physics prize

Three US-based scientists are sharing this year's Nobel Prize for physics but they were sharing the acclaim with Albert Einstein whose theory laid the groundwork for their study of gravitational waves.

R ainer Weiss of the Massachusetts Institute of Technology and Barry Barish and Kip Thorne of the California Institute of Technology won the 2017 prize for a combination of highly advanced theory and ingenious equipment design, Sweden's Royal Academy of Sciences announced.

The scientists were key to the first observation of gravitational waves in September 2015.

When the discovery was announced several months later, it was a sensation not only among scientists but the general public.

"It's a win for the human race as a whole.

"These gravitational waves will be powerful ways for the human race to explore the universe," said Mr Thorne, speaking by phone from California.

"I view this more as a thing that recognises the work of a thousand people," Mr Weiss told reporters at the announcement news conference.

The prize is "a win for Einstein, and a very big one", Mr Barish said.

The German-born Mr Weiss was awarded half of the nine-million-kronor (£834,000) prize amount and Mr Thorne and Mr Barish will split the other half.

Gravitational waves are extremely faint ripples in the fabric of space and time, generated by some of the most violent events in the universe.

The waves detected by the laureates came from the collision of two black holes some 1.3 billion light-years away. A light-year is about 5.88 trillion miles.

Ariel Goobar of the Royal Swedish Academy of Sciences said the winners' work meant "we can study processes which were completely impossible, out of reach to us in the past".

"The best comparison is when Galileo discovered the telescope, which allowed us to see that Jupiter had moons. And all of a sudden, we discovered that the universe was much vaster than we used to think about," Mr Goobar said.

With the technology that the three developed "we may even see entirely new objects that we haven't even imagined yet", said Patrick Sutton, an astronomer at Cardiff University in Wales.

The waves were predicted by Einstein a century ago as part of his theory of general relativity.

General relativity says that gravity is caused by heavy objects bending space-time, which itself is the four-dimensional way that astronomers see the universe.

Mr Weiss in the 1970s designed a laser-based device that would detect gravitational waves.

He, Mr Thorne and Mr Barish "ensured that four decades of effort led to gravitational waves finally being observed", the Nobel announcement said.

The laser device, called an interferometer, must be both exquisitely precise and extremely stable.

"The beam must hit the mirrors precisely. They should hardly shake at all, not even when leaves fall from nearby trees," according to a Nobel background paper.

The announcement said Einstein was convinced that gravitational waves could never be measured.

The laureates used laser devices "to measure a change thousands of times smaller than an atomic nucleus".

In a moment of poetry aimed at making the distant and infinitesimal phenomenon understandable to non-experts, the academy announcement said gravitational waves "are always created when a mass accelerates, like when an ice-skater pirouettes or a pair of black holes rotate around each other".


Press Association

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