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  1. #1
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    Default The first matter-antimatter collisions



    I was wondering, If the big bang is a singularity which contained all of the 4 forces: Electromagnetism, The Strong Nuclear Force, The Weak Nuclear Force and Gravity. Then one can deduce that subatomic particles along with Atoms of matter, and Atoms of antimatter came from both of the nuclear forces, the strong and the weak. My questions is, the atoms from the matter-antimatter collision, were those atoms of hydrogen and anti hydrogen? Or were they a completely different element? Or did those collisions take place at the subatomic level with Positrons and antipositrons? like at the LHC. Or were they something else all together?

  2. #2
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    One of the topics of investigation that the LHC might resolve is exactly when the four forces became separate. Current thinking is that initially, they were unified, and it wasn't until some time later (only a fraction of a second later, but not instantly) that they diverged. It was quite a long time later (the figure 300,000 years sticks in my mind) that matter became cool enough to form atoms, almost all of which would have been hydrogen. I think one of the ongoing fields of research is just when the antimatter got annihilated. It would have been early in the process, before atoms formed.

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  4. #3
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    Default

    Hmm. . .

    I think that in some sense the best answer is that no one really knows for sure. Theoretically one might assume that the universe began with equal quantities of antimatter and matter. No one has really nailed down why our universe appears to be made up of essentially only matter.

    It appears at this time that very early in the history of the universe (likely before the formation of atoms) the matter and antimatter annihilated each other until the%
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    Like Keith said, it took a while for everything to cool down enough to bond together. Before that, everything was a kind of quark-gluon plasma. The temperature needed to drop in order for the quarks and gluons to bond and form protons and neutrons. So, technically the forces would have came at different times.
    For example: the weak force would have had to come later when protons and neutrons were formed and were able to decay. And the strong force would have had to come before the weak force before the first protons and neutrons existed.

    All of the matter that annihlated with anti-matter would have been at the subatomic level during that stage of development. And how awesome is it that there was just a tiny bit more matter than anti-matter? I love the quantum world.
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    I don't know much about this stuff, but my understanding is that main mission of the upcoming final Endeavor mission is to attach the Alpha Magnetic Spectrometer (AMS), which can detect various particles, including anti-matter, as cosmic rays pass through it.

    An AMS has previously been taken up to the ISS, but it only stayed up there for the duration of the 2-week shuttle mission. This time they'll leave it up there for 6 months or a years, I think.
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    Quote Originally Posted by heman90210 View Post
    were those atoms of ... anti hydrogen?
    I like idea that dark matter is made of anti-matter. See article X Particle Explains Dark Matter and Antimatter at the Same Time
    But just like idea. I will wait other works for pluses and minuses of this theory.

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    Quote Originally Posted by astroval View Post
    I like idea that dark matter is made of anti-matter. See article X Particle Explains Dark Matter and Antimatter at the Same Time
    But just like idea. I will wait other works for pluses and minuses of this theory.
    Another really good theory about dark matter involves neutrinos and the cumulative effect of their extremely small mass.
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    Quote Originally Posted by Cladinator View Post
    Another really good theory about dark matter involves neutrinos and the cumulative effect of their extremely small mass.

    I am OK with anti-neutrinos. Antineutrinos, like neutrinos, interact with other matter only through the gravitational and weak forces. Its very difficult detect and also they can explain where is anti-matter.

    Why not?

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