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gk007
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Is a matter-antimatter annihilation just a particle turning around in time, or is it a particle from the present being hit by a partcle from the future (because antimatter is matter going back in time)?
No, usually matter-antimatter annhilation involves transformations. For example, an annihilation of an electron with a positron results in two photons. In the case of a proton-antiproton, the reaction can produce various particles, e.g., a cascade of mesons (pions), which themselves decay to muons (and neutrinos or anti-neutrinos), which decay to electrons/positrons (and anti-neutrinos or neutrions).gk007 said:Is a matter-antimatter annihilation just a particle turning around in time, or is it a particle from the present being hit by a partcle from the future (because antimatter is matter going back in time)?
gk007 said:But how would that work using the theory that antimatter is just matter going back in time?
The only time an electron-positron pair can be considered to be an electron going both forward and backwards in time is in the vacuum-polarization diagram as shown in the Feynman "bubble" diagram. Electrons and positrons are "created" at one vertex, and "annihilated" (to a single photon) at the other. The Feynman diagram (see arrows) is shown ingk007 said:Is a matter-antimatter annihilation just a particle turning around in time, or is it a particle from the present being hit by a partcle from the future (because antimatter is matter going back in time)?
Thanks for clearing that up :)Naty1 said:I do not think there is any experimental evidence for such time reversal; there IS experimental evidence for Astronuc's description. Our mathematics is generally time symmetric, yet that is NOT how our universe works...the past appears different than the future. Just another example of how little we understand about the basics suchas time, space,matter, etc.
I hope so...On a side note, why does antimatter react with matter so spectacularly?Naty1 said:Still LOTS of cool stuff to discover...
Naty1 said:Some mathematics suggests antiparticles move in the reverse time direction.
You are strictly right, but I think this is not helpful in the context. Your argument applies to weak interactions. What we are talking about here applies to just free relativistic particle particles, even before one begins the chapter on QED.Vanadium 50 said:This is untrue.
Because it is the physical meaning of CPT invariance. It is the interpretation people make (after Wheeler suggested it to Feynman) for the necessity of anti-particles. For instance, we can understand in this manner dualities between :Vanadium 50 said:OK, let's turn it around. Why is it helpful to think of antimatter as matter going back in time? If it's a convenient fiction, what is convenient about it? Is there any phenomenon that is easy to explain in this way?
Veltman said:On the evening of the day (in 1965) that Feynman celebrated his Nobel prize he received a telegram during the party: “Send back my notes, please”, signed Stückelberg. According to my source (unpublished biography of Stückelberg by Ruth Wenger) the originator of the joke was Gell-Mann. I asked Gell-Mann if he had sent this telegram, but he denied that, adding that it was a nice idea.
I think it means the time component of four velocity has negative sign, but I'd be glad if someone could clarify.mr. vodka said:Vanadium what do you mean with "going back in time"?
Yes, going backwards in time is also having negative energy.Dead Boss said:I think it means the time component of four velocity has negative sign, but I'd be glad if someone could clarify.
Vanadium 50 said:It has been known since 1964 that this is not the case: there is an experimentally measurable difference between matter moving backward in time and antimatter moving forward in time. This work got the Nobel prize, so one would think Prof. Kaku and other popularizers would be aware of it.
Matter-antimatter annihilation is a process in which a particle of matter collides with its corresponding antiparticle, resulting in the conversion of their mass into energy. This process is governed by the laws of physics and is a fundamental aspect of the structure of the universe.
A matter-antimatter annihilation occurs when a particle and its corresponding antiparticle come into contact with each other. The particles then undergo a process called pair production, in which they convert their mass into energy in the form of photons. This release of energy is what we observe as the annihilation event.
No, a matter-antimatter annihilation is not just a particle turning around in time. This is a common misconception. The annihilation process involves the conversion of mass into energy, and it is not simply a reversal of time for the particles involved.
Matter-antimatter annihilation is important in science because it helps us understand the fundamental laws of physics and the structure of the universe. It is a crucial process in the formation of stars and galaxies, and it also plays a role in the production of energy in nuclear reactions.
Yes, we can observe matter-antimatter annihilation in real life through experiments in particle accelerators. These machines allow us to create and study antimatter particles, and when they come into contact with matter particles, annihilation occurs, producing energy that can be detected and measured by scientists.