Einstein would not be happy.

StephenW

Particles that dared to defy Einstein put to the test                                               Glenda Kwek    September 27, 2011 - 3:53PM
A US government agency is set to test the results of the discovery of particles travelling faster than the speed of light, announced last week, which shocked the physics world and led to dreams of time travel and extra dimensions.
The new tests could show Albert Einstein's 1905 theory of special relativity - that nothing can travel faster than the speed of light - may be sound after all.
Einstein, the father of modern physics, said the speed of light was a "cosmic constant" and nothing could go faster.

Data collected in the OPERA experiment by the CERN research institute in Switzerland showed invisible neutrino particles travelled faster than light.
            However, scientists from Fermilab, a US Department of Energy laboratory in Chicago, said they were re-analysing the results, a spokesman for the agency told smh.com.au today.
            Fermilab conducted a similar experiment - MINOS - in 2007, but its results allowed for a margin of error that made it unclear if neutrinos were indeed travelling faster than light.
            "We're updating the [MINOS] to measure more precisely the time that it takes the neutrinos to travel from Fermilab to the detector in Minnesota," spokesman Kurt Riesselmann said.
            "The experiment will also take new data in the upcoming year and analyse those, and hope to improve the position to confirm or refute the OPERA result," Dr Riesselmann said.
            Was Einstein wrong?
            Scientists across the world, and even at CERN - home of the Large Hadron Collider - have been sceptical about the OPERA finding.
            The OPERA measurements, if independently confirmed, would mean that, in theory, information could be sent into the past, making time travel possible.
            "Time travel seems to be the go-to topic when faster-than-light particles are mentioned, but don't hold out hope for a TARDIS just yet," physicist Dr Jonathan Carroll at the University of Adelaide wrote on The Conversation website, referring to a time-travelling machine featured in the British television drama Doctor Who.
            But he said it was more likely the OPERA finding was the result of a mistake in the calculations or experiment.
            "The much more likely scenario is that the analysis has overlooked some seemingly insignificant but critical aspect, and that re-analysis will led to a very good agreement with the speed of light.
            "Should that be the case, the follow-up press release will no doubt refer to the 'Phantom of the OPERA'."
            Another physicist likened the CERN discovery to flying carpets, saying: "This is ridiculous what they're putting out.
            "Until this is verified by another group, it's flying carpets," Professor Drew Baden at the University of Maryland told The Associated Press.

Read more: http://www.smh.com.au/technology/sci-tech/particles-that-dared-to-defy-einstein-put-to-the-test-20110927-1kuys.html#ixzz1Z9JgjGIY

走遍四方

299798454米/秒，而光速仅有299792458米/秒。

----------------就快这么一点点（20/million)，，，不知道有没有错误。。。当然，伟大的进步都是从一点点开始的俄。。

hbv30year

原来速度很接近, 应该是同一种性质的东西, 测量误差罢了.

走遍四方

回复 StephenW 的帖子

估计你能看到且知道答案，但你无法告诉她，无法改变它，同样也可以看到过去的影像。也无法改变它。。

而且你看看到的多远的未来呢，

StephenW

hbv30year 发表于 2011-9-28 10:31
原来速度很接近, 应该是同一种性质的东西, 测量误差罢了.

Most likely,  I think.

走遍四方

回复 hbv30year 的帖子

也不定呀。。毕竟是超超超高速的东西。提高一点，发现一点都特特特艰难。。

StephenW

走遍四方 发表于 2011-9-28 10:32
回复 StephenW 的帖子

估计你能看到且知道答案，但你无法告诉她，无法改变它，同样也可以看到过去的影像。 ...

I only want to see the next winning lottery numbers before they are drawn. That is far enough in the future I want to see.

StephenW

Einstein bounces back: as doubt cast, another fundamental theory confirmed               

Read more: http://www.smh.com.au/technology/sci-tech/einstein-bounces-back-as-doubt-cast-another-fundamental-theory-confirmed-20110929-1ky3o.html#ixzz1ZK5LLy58

Poor old Einstein has had a rough few days.
            It all began with an experiment last week that bizarrely found sub-atomic particles called neutrinos appear to move faster than the speed of light.
            The finding was a shock.
                                    
                           
            The speed of light was enshrined in 1905 by Einstein as the Universe's speed limit. Today, physicists almost everywhere accept it as such. Could the great man have got it terribly wrong?
            But soon after this shadow fell across Einstein's reputation, another experiment came along which has validated - magnificently and on a cosmological scale - another of his landmark ideas.
            According to Einstein's general theory of relativity, light emitted from stars and galaxies is slightly tugged by gravity from celestial bodies.
            Danish astronomers have put the theory to the test in measuring light emitted by galactic "clusters".
            These are sectors of deep space which are packed with thousands of galaxies, held together by their own gravity. Their density and mass should thus have a perceptible gravitational effect on the light they emit.
            University of Copenhagen cosmologist Radek Wojtak and colleagues analysed light from around 8000 of these clusters.
            They were looking for variations in "redshift", a measurement of the shift in light. As the Universe expands, light from a star becomes slightly redder as its wavelength lengthens, indicating a widening distance between the star and Earth.
            Wojtak's team measured the wavelength of light from galaxies lying in the middle of the galactic clusters, where the densest gravitational pull prevailed, and those lying on the more sparsely-populated periphery.
            "We could measure small differences in the redshift of the galaxies and see that the light from galaxies in the middle of a cluster had to 'crawl' out through the gravitational field, while it was easier for the light from the outlying galaxies," said Wojtak.
            They then measured the galaxy cluster's total mass to get a fix on its gravitational potential.
            "The redshift of light is proportionately offset in relation to the gravitational influence from the galaxy cluster's gravity," said Wojtak.
            "In that way, our observations confirm the theory of relativity."
            The findings do not negate popular theories about dark matter and dark energy, the enigmatic phenomena that account for almost all over the matter in the Universe.
            Until now, Einstein's theory of the impact of gravity on light had only been tested from within the Solar System itself - essentially by measuring light from the Sun that was "redshifted" by the gravitational pull of Mercury.
            On September 22, physicists reported that neutrinos can travel faster than light, a finding that - if verified - would blast a hole in Einstein's theory of special relativity.
            In experiments conducted between the European Centre for Nuclear Research (CERN) in Switzerland and a laboratory in Italy, the particles were clocked at 300,006 kilometres per second, about six km/sec faster than the speed of light, the researchers said.
            The physicists themselves admitted they were quite flummoxed by the findings and other experts are skeptical, suggesting a problem in measurement techniques or equipment.
            Wojtak's research is released on Wednesday by Nature, the British scientific journal.
            AFP

StephenW

回复 风雨不动 的帖子

The Astronomer Royal, Lord Martin Rees used the same quote as you:
"Extraordinary claims require extraordinary evidence."

Astrophysicist and cosmologist Martin Rees of the University of Cambridge
Extraordinary claims require extraordinary evidence. I think it will be  perceived in retrospect as an embarrassment that this claim received so  much publicity—the inevitable consequence of posting a preprint on the Web. Neutrinos were observed from SN 1987A more or less coincidentally  with the explosion—not four years earlier, as would have been the case  if the velocity difference had been the same as is now claimed (though,  of course, the energies of the supernova neutrinos are much lower).