89
edits
Changes
Jump to navigation
Jump to search
Line 15:
Line 15: − <!--#''Subatomic particles have a speed observed to be faster than the speed of light, which contradicts a fundamental assumption of Relativity. The Italian lab that "shocked the scientific world" has announced more precise results, confirming their previous announcement''.+ − #:This is an interesting observation. The world's best scientific minds are looking into it. That relativity is incorrect is not being taken seriously as a possible explanation. − #:'''Update:''' The problem seems to have been caused by a faulty cable connection between a computer and a GPS unit. When the connection was repaired, the travel time increased by 60 nanoseconds, which had been the amount of the anomaly <ref>http://www.cbc.ca/news/world/story/2012/02/22/technology-faster-than-light-neutrinos.html</ref> <ref>http://www.foxnews.com/scitech/2012/02/22/loose-wire-led-to-stunning-faster-than-light-particle-finding/?intcmp=features</ref>. − -->#''The Pioneer anomaly.'' + + + +
Essay:Rebuttal to Counterexamples to Relativity (view source)
Revision as of 16:54, March 17, 2012
, 16:54, March 17, 2012Per email from SamHB, who can't log in today
#::The objection has been raised that this would still be a counterexample to Relativity.
#::The objection has been raised that this would still be a counterexample to Relativity.
#:::Yes, if it were actually true that the Moon's orbit is undergoing some kind of anomalous perturbation, it would indeed be a disproof of Relativity, Newtonian mechanics, and, in fact, all of physics since Galileo.
#:::Yes, if it were actually true that the Moon's orbit is undergoing some kind of anomalous perturbation, it would indeed be a disproof of Relativity, Newtonian mechanics, and, in fact, all of physics since Galileo.
#''The Pioneer anomaly.''
#:The "Pioneer anomaly" is the deviation in the motion of the Pioneer 10 and Pioneer 11 spacecraft from their predicted motion, at the distance of Saturn and beyond. It should be noted that the anomaly is about 1000 times greater than the difference between the classical Newtonian prediction and the prediction of relativity, so this is not a problem with relativity ''per se''; it is more general than that.
#:The "Pioneer anomaly" is the deviation in the motion of the Pioneer 10 and Pioneer 11 spacecraft from their predicted motion, at the distance of Saturn and beyond. It should be noted that the anomaly is about 1000 times greater than the difference between the classical Newtonian prediction and the prediction of relativity, so this is not a problem with relativity ''per se''; it is more general than that.
#:Calculating the force caused by heat (that is, miniscule amounts of infrared radiation) from the radioactive power source was one of the first effects that was examined. The anomaly arose when this and other known effects could not fully explain the deviation.
#:Calculating the force caused by heat (that is, miniscule amounts of infrared radiation) from the radioactive power source was one of the first effects that was examined. The anomaly arose when this and other known effects could not fully explain the deviation.
#:The problem is believed to have been solved by taking into account the reflection of the radiation from the power source off of the back of the antenna dish<ref>http://www.technologyreview.com/blog/arxiv/26589/</ref>. The solution is sometimes described as an application of "Phong shading", a technique of computer graphics that is now considered imprecise. But Phong shading itself is not what is important. The "ray tracing" computer graphics technique that underlies Phong shading was what inspired the scientists to take reflection into account.
#:The problem is believed to have been solved by taking into account the reflection of the radiation from the power source off of the back of the antenna dish<ref>http://www.technologyreview.com/blog/arxiv/26589/</ref>. The solution is sometimes described as an application of "Phong shading", a technique of computer graphics that is now considered imprecise. But Phong shading itself is not what is important. The "ray tracing" computer graphics technique that underlies Phong shading was what inspired the scientists to take reflection into account.
#''Subatomic particles have a speed observed to be faster than the speed of light, which contradicts a fundamental assumption of Relativity. The Italian lab that "shocked the scientific world" has announced more precise results, confirming their previous announcement''.
#:This is an interesting observation. The world's best scientific minds are looking into it. That relativity is incorrect is not being taken seriously as a possible explanation.
#:'''Update:''' The problem seems to have been caused by a faulty cable connection between a computer and a GPS unit. When the connection was repaired, the travel time increased by 60 nanoseconds, which had been the amount of the anomaly <ref>http://www.cbc.ca/news/world/story/2012/02/22/technology-faster-than-light-neutrinos.html</ref> <ref>http://www.foxnews.com/scitech/2012/02/22/loose-wire-led-to-stunning-faster-than-light-particle-finding/?intcmp=features</ref>.
#:The objection has been raised that a recent news report from the BBC ("now we are 100% sure that the speed of light is the speed of neutrinos") is also contradictory, since neutrinos have mass and are therefore forbidden by relativity to travel at exactly the speed of light. Since the neutrino energies were 17GeV, and the current estimate for the neutrino mass is about 0.25eV, the deviation from the speed of light would be about 1 part in 10<sup>22</sup>. This means that the neutrinos would arrive at the detector about .26x10<sup>-24</sup> seconds (.26 yoctoseconds) later than the speed of light itself. This is one quarter of a billionth of a femtosecond, or about .26x10<sup>-15</sup> of a nanosecond. The accuracy of the GPS units and cesium clocks used in the measurement is greater than a nanosecond, so the discrepancy cannot possible be detected. It is unfortunate that the claim "the speed of light is the speed of neutrinos" was taken so literally.
#''Anomalies in the locations of spacecraft that have flown by Earth ("flybys").''
#''Anomalies in the locations of spacecraft that have flown by Earth ("flybys").''
#:This may be another case of the Pioneer anomaly, or it may be something else. However, it is very unlikely that it shows that relativity is wrong and Newtonian mechanics is correct.
#:This may be another case of the Pioneer anomaly, or it may be something else. However, it is very unlikely that it shows that relativity is wrong and Newtonian mechanics is correct.