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Lisa!
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what do they mean when they say "neutrino scalar waves travel back and forwards in time"?and why does it happen for neutrino?
If you are talking about something such as http://www.pureenergysystems.com/events/conferences/2004/teslatech_SLC/KonstantinMeyl/NeutrinoPower_ScalarWaves.htm , and only photons can be massless and therefore travel at c. Neutrinos are very fast, but do not travel at c nor does any other particle with mass. See:Lisa! said:what do they mean when they say "neutrino scalar waves travel back and forwards in time"?and why does it happen for neutrino?
Labguy said:If you are talking about something such as http://www.pureenergysystems.com/events/conferences/2004/teslatech_SLC/KonstantinMeyl/NeutrinoPower_ScalarWaves.htm almost nothing relative to my question.
You mean dark matter doesn't consist of neutrino for sure!only photons can be massless and therefore travel at c. Neutrinos are very fast, but do not travel at c
No, neutrinos may be part of dark matter along with many other unknown possibilities. I haven't heard that dark matter is, or would be, confined to only one type of matter. Also I have never heard at all that dark matter would travel at c. Perhaps you are thinking of "dark energy" instead of dark matter (?), but they would not be the same thing.Lisa! said:You mean dark matter doesn't consist of neutrino for sure!
Lisa! said:I said neutrino couldn't be part of dark matter because it's not massless but well,as you say it's still a good conditate for dark matter.Thanks both of you.
I still don't know if neutrino could travel to the past and what does it mean.
could you please tell me about other condidates?ohwilleke said:This doesn't make sense. Dark matter has to be massive. There are no non-massive dark matter candidates.
Lisa! said:Thank you very much.
could you please tell me about other condidates?
Lisa! said:Thank you very much.
could you please tell me about other condidates?
Labguy said:If you are talking about something such as http://www.pureenergysystems.com/events/conferences/2004/teslatech_SLC/KonstantinMeyl/NeutrinoPower_ScalarWaves.htm , and only photons can be massless and therefore travel at c. Neutrinos are very fast, but do not travel at c nor does any other particle with mass. See:
http://www.physlink.com/Education/AskExperts/ae476.cfm for the reasons why, and discussion on neutrinos in particular.
That is correct, also in that momentum relates to kinetic energy. But, for a photon this does not relate to having "mass" as we generally define it. From a .gov site:No-where-man said:There is only one problem,photons do have mass,the mass of the momentum!
and:It a result of the theory of relativity that a photon has momentum, but have zero mass. One of the worrisome aspects of relativity and quantum mechanics is that we must abandon our graphic notions of Newtonian mechanics, and also some of the notions of classical electromagnetic theory of Maxwell. The problem you are asking about is only one of several notions that has to be abandoned. In addition, there is the "fact" that the photon has angular momentum -- but from the classical picture, "something" has to be spinning. What's spinning? And an electron orbiting a proton in the hydrogen atom should spiral into the proton emitting electromagnetic radiation, but it doesn't. Why not? The "why not" to all the above is that our classical picture just does not correspond to observation, so we are forced to reject our "picture" and adhere to the "observation" and not the other way around. Richard Feynman discusses the momentum of a photon in Vol. I - 34 - 10 of his Lectures on Physics.
Bottom line is we are both right.For most average objects, momentum is truly mass x velocity. When motion gets close to the speed of light, we find that the momentum relation p=mv is only an approximation. It is only correct when speed (v) is much smaller than the speed of light (c). The relation that works for all speeds is E^2= p^2c^2 + m^2c^4. It is much less convenient to use, and doesn't help figure anything out until you reach speeds of perhaps thirty million meters per second. For a particle with no mass, the relation reduces to E=pc. This works for a photon. For very small speeds, the system reduces to E=mc^2 + (1/2)mv^2, and p=mv. This leads to relations with kinetic energy and momentum: much more convenient to work with and just as accurate until you reach speeds close to the speed of light.
selfAdjoint said:Labguy, No-where-man is NOT right to speak about the "mass of the momentum". The idea of momentum - mass times velocity is simply WRONG for photons. The magnitude of a photon's momentum is given by Einstein's other equation [tex]p = h\nu[/tex] where h is Planck's constant and [tex]\nu[/tex] is the photon's frequency.
And the energy formula you give, [tex]E = \sqrt{p^2c^2 + m^2c^4}[/tex] works easily at slow speeds; massive particles have rest frames (photons don't) and in its rest frame the particle's momentum is zero, so the first term under the square root vanishes and the formula reduces to [tex]E = \sqrt{m^2c^4} = mc^2[/tex], Einstein's famous equation. But note that even for massive bodies, like neutrinos, the formula says part of their energy comes from momentum.
ohwilleke said:How can a photon have energy?
Clearly, photons have energy. Have you have gotten a sunburn or tan? Have you ever owned a solar calculator? Have you ever seen a plant grow?
Lisa! said:You know I heard "neutrino could travel to the past!" in a lecture I think.so I searched for it and I just found this article!almost nothing relative to my question.
Thank you very much.You know I'd searched for neutrino and traveling to the past before I started this thread, but I couldn't find what you re-printed here.Creator said:Lisa; you are probably referring to the speculation that neutrinos may be superluminal. I remember addressing this issue somewhat previously (on a previous thread) and so I've re-printed the post here.
Quote:
Originally Posted by Creator
"I thought you were going to bring up the nature of the neutrino measurement which also adds to the speculation.
It is a not-so-commonly realized fact that it is NOT the neutrino mass that is measured experimentally; rather, it is the mass squared term that is measured, and it is turns out almost always to be negative; in other words, negative mass squared. This negative mass squared can be referred to as 'imaginary' and thus can be used to imply superluminal velocity. Thus the supernova 1987A neutrino-preceeding-photon observation can equally be regarded as evidence to support superluminal neutrinos.
http://arxiv.org/PS_cache/hep-ph/pdf/9712/9712265.pdf
Just thought you guys ought to know.
Creator
--Give me ambiguity or give me something else.--
Oh yea, and here's another article by Cramer along the same line as my previous post. I always liked his 'alternate view'.
It's a bit less technical for those needing simplicity.
http://www.npl.washington.edu/AV/altvw93.html
(See the very end of the article - last 3 paragraphs)."
Creator
Here's another with a bit more info on the implications of the negative mass squared term:
http://www.npl.washington.edu/AV/altvw54.html
Neutrino scalar waves are a hypothetical type of wave that is believed to be carried by neutrinos, a type of subatomic particle. These waves are thought to have a scalar (magnitude only) rather than vector (magnitude and direction) nature.
Neutrino scalar waves are believed to travel through space at the speed of light. They are also thought to be able to penetrate through solid objects, making them difficult to detect.
The idea of neutrino scalar waves traveling both forward and backward in time is still a topic of debate and research in the scientific community. Some theories suggest that this ability could have implications for understanding the nature of time and the universe.
Currently, there is no conclusive evidence of the existence of neutrino scalar waves, so there is no established method for detecting them. Scientists are working on developing new technologies and experiments to try and capture evidence of these waves.
If proven to exist, neutrino scalar waves could have a range of potential applications, such as communication technology that is unaffected by physical barriers, advanced imaging techniques, and possibly even time travel. However, more research is needed to fully understand the properties and potential uses of these waves.