Tag: Neutrinos

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Neutrinos can’t beat speed of light

It is now official: neutrino researchers admit Albert Einstein was right.

Mark Brown, Wired UK, writes:

Back in September 2011, a team of particle physicists detected neutrinos moving faster than the speed of light as they traveled from CERN to the Gran Sasso lab. They smashed the universal speed limit by 60 nanoseconds — a result that was constant, even after 15,000 repetitions of the process. The results seem to run counter to a century’s worth of physics and would overturn Einsten’s special theory of relativity if true. As such, CERN called for more experiments to double-check the findings.

[…] At the International Conference on Neutrino Physics and Astrophysics in Kyoto on June 8, CERN research director Sergio Bertolucci presented results on the travel time of neutrinos from CERN to the INFN Gran Sasso Laboratory, on behalf of four experiments — Borexino, Icarus, LVD and Opera. All four experiments measured a neutrino time of flight that was below the speed of light, confirming that neutrinos respect Einstein’s cosmic speed limit. The previous anomaly was “attributed to a faulty element of the experiment’s fibreoptic timing system.”

If you don’t get why it would have been a big deal to prove Einstein’s theory wrong, a news on The Guardian explains it all:

Travelling faster than the speed of light goes against Albert Einstein’s theory of special relativity. If it were possible, it would open up the troubling possibility of being able to send information back in time, blurring the line between past and present and wreaking havoc with the fundamental principle of cause and effect.

 Now we know where we stand.

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One day, we will use a neutrinophone, like in Star Trek

This is the kind of news I like. If you thought your new mobile phone was the best ever made, you’re wrong. What about a phone using neutrinos? What about a neutrinophone?

Jeff Nelson is the Cornelia B. Talbot Term Distinguished Associate Professor of Physics at William & Mary and in this article, he explains that the neutrinophone demonstration was a side project stemming from neutrino research at the Fermi National Accelerator Laboratory.

About the neutrinos:

Neutrinos are mysterious subatomic particles emitted in unimaginable numbers by nuclear reactions. Despite their high numbers, scientists are just now learning about the characteristics of neutrinos. William & Mary’s physicists are involved in several large multinational collaborations aimed at learning about the properties of neutrinos. In addition to MINERvA and the other Fermilab experiments, William & Mary researchers are involved in other neutrino investigations, most notably the Daya Bay initiative in China.

How it works:

The beam of neutrinos  travels through hundreds of meters of rock on the way to the MINERvA detector, which Nelson explains is designed to study neutrino interactions in detail. For communication over the neutrinophone, the physicists used a simple 1-0 binary code. “If you saw neutrinos, it was a zero; if there weren’t any neutrinos, it was a one,” he explained. “There are standard encoding patterns, ASCII is one of the ones that is used on the computer that tell you what letter corresponds to a series of so many digits of binary bits.”

And the pbest part for the end:

As a practical communications tool, the neutrinophone sits on the border of science and science fiction. Nelson notes that Star Trek characters use neutrino communications, but there are a number of scientific and engineering challenges to creating an interplanetary neutrinophone.

My geek friends and dear Star Trek fans, our dream will, one day, become a reality!