If a signal supposedly detected at a research facility is verified, it would confirm one of the most dramatic predictions of Albert Einstein’s theory of general relativity. Photograph: National Geographic Image Collec/Alamy

Cosmologist’s tweet appears to confirm rumours of discovery that could ‘open a new window on the universe’.

Not for the first time, the world of physics is abuzz with rumours that gravitational waves have been detected by scientists in the US.

Lawrence Krauss, a cosmologist at Arizona State university, tweeted that he had received independent confirmation of a rumour that has been in circulation for months, adding: “Gravitational waves may have been discovered!!”

The excitement centres on a longstanding experiment known as the Advanced Laser Interferometer Gravitational-Wave Observatory (Ligo) which uses detectors in Hanford, Washington, and Livingston, Louisiana to look for ripples in the fabric of spacetime.

According to the rumours, scientists on the team are in the process of writing up a paper that describes a gravitational wave signal. If such a signal exists and is verified, it would confirm one of the most dramatic predictions of Albert Einstein’s century-old theory of general relativity.

Krauss said he was 60% confident that the rumour was true, but said he would have to see the scientists’ data before drawing any conclusions about whether the signal was genuine or not.

Researchers on a large collaboration like Ligo will have any such paper internally vetted before sending it for publication and calling a press conference. In 2014, researchers on another US experiment, called BICEP2, called a press conference to announce the discovery of gravitational waves, but others have since pointed out that the signal could be due entirely to space dust.

Speaking about the LIGO team, Krauss said: “They will be extremely cautious. There’s no reason for them to make a claim they are not certain of.”

If gravitational waves have been discovered, astronomers could use them to observe the cosmos in a way that has been impossible to date. “We would have a new window on the universe,” Krauss said. “Gravitational waves are generated in the most exotic, strange locations in nature, such as at the edge of black holes at the beginning of time. We are pretty certain they exist, but we’ve not been able to use them to probe the universe.”

Einstein predicted that the waves would be produced in extremely violent events, such as collisions between two black holes. As gravitational waves spread out, they compress and stretch spacetime. The ripples could potentially be picked up by laser beams that measure minute changes in the lengths of two 4km-long pipes at the Ligo facilities.

Engineers occasionally add synthetic signals to the Ligo data to test the equipment. While these are designed to mimic gravitational wave signals, Krauss said he had heard explicitly that the signal had not been added artificially.

“I don’t know if the rumour is solid,” Krauss told the Guardian. “If I don’t hear anything in the next two months, I’ll conclude it was false.”

Gabriela Gonzalez, professor of physics and astronomy at Louisiana State University, and the spokesperson for the LIGO collaboration, told the Guardian: “The LIGO instruments are still taking data today, and it takes us time to analyse, interpret and review results, so we don’t have any results to share yet.

“We take pride in reviewing our results carefully before submitting them for publication – and for important results, we plan to ask for our papers to be peer-reviewed before we announce the results – that takes time too!” she said.

This article was updated on 12 January 2016 to include a response from the spokesperson for the LIGO collaboration.


Source  www.theguardian.com

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Arne Sørensen · January 12, 2016 at 7:54 pm

Well, maybe and maybe, we have to see, a new way to see the universe 🌌, well by the time we don’t understand the present ideas of the universe 🌌, maybe it just are there and that’s it 🆒🆒 😊 😊 😄 😄

Judy Frank Moken · January 12, 2016 at 6:20 pm

LIGO is going to be a problem. It will activate the earthquakes and cause problems inside the caverns of the earth which man has extracted minerals and gases. The problem of the equipment isn’t that messages will come back but from whom – Satan, the half angels, etc. We had better think twice about if the technology on that large a transmission is good for the earth. The crystal cave in Mexico will take the signal and magnify it exponentially. We don’t know about the safety or what can happen. I would use the technology for other things – creating materials – health and medical issues -. Even transportation. Use the technology wisely- God be With You!

Lucy Lucy-laisa Bruni · January 12, 2016 at 5:27 pm

Sounds exciting.

Stephen Peirce · January 12, 2016 at 4:51 pm

Yes but some stayed.

Bob Cole · January 12, 2016 at 4:44 pm

Might find a wave never a particle just saying as they don’t exist in our universe thats why gravity is only a quater the strenght of the other fundimental forces therrfore antigravity particles do exist as discovered by a Californian lab a few years ago and then forgotten about as usual

Marianne Grimm · January 12, 2016 at 4:34 pm


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