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My idea on what happened to all the antimatter.

  1. Sep 16, 2008 #1
    I have recently been reading Moment of Creation by James Trefil, and I have stumbled upon the question, where has all the antimatter gone? I asked myself, what if micro black holes produced by the tremendous energy at the big bang are the answer? If you have an understanding in hawking radiation then you know particle-antiparticle pairs are produced at balck holes. What if, by chance, antiparticles were absorbed by these micro black holes more than regular particles. It could explain why there is more matter than antimatter. Has this been dissproved by anyone? Is this a plausible theory?
  2. jcsd
  3. Sep 16, 2008 #2


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    I have to admit; that's a new one on me. Not completely ridiculous, especially since the emmitted particle from Hawking radiation is always matter (or positive energy), never antimatter. On the surface, I can't see any glaring flaw, but let's see what other PFer's have to say.
  4. Sep 16, 2008 #3
    I would like to know if there is perhaps any possible mathematics available to back this statement in anyway or even dissprove it. It seems to make sense to me.I'm only a Junior in highschool so I don't have the necessary math skills or anything like that, just an idea.
  5. Sep 16, 2008 #4
    Well, Derek, this is a rather complex version of how antimatter got the short end of the stick, so to speak. The quick version of the explanation is that there was an asymmetry between decaying boson-anti boson pairs that left something like one part of matter for every billion boson pairs that annihilated (I’ve got a book with the exact figure that I can post later). This happened about 10^-32 seconds after the Big Bang.
    In Hawking radiation, a virtual particle falls into a black hole and the other particle gains enough energy to become “real”.

    At this point in the early universe however, all the virtual particles and antiparticles were real because of the energy level created by the separation of the Super Force. So, if an antiparticle fell into a black hole, it would not create a real particle by this action. Thus, for your explanation to work, you must describe how more of the antimatter fell into the black holes than matter.
  6. Sep 16, 2008 #5
    Ok that sounds good. Thank you for your insight! However, like previously posted, does Hawking Radiation "prefer" antimatter or matter? But also, it could occur by chance. It could have just been chance that caused more anti-matter to fall in than matter.
  7. Sep 16, 2008 #6


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    Looking at on a large scale, the chance occurence could not account for the existence of matter.
  8. Sep 17, 2008 #7
    As a gross oversimplification of Hawking Radiation, the virtual particle falling into a black hole causes the black hole to lose the energy that creates the real particle. So whether this was a particle or an antiparticle that fell in, the overall effect was that the BH lost energy. Thus, the particle that fell in had the effect of “negative energy” and the other particle gets created from positive energy and so becomes “real” matter.
    (The actual process is more involved but uses quantum tunneling and is less intuitive.)

    The high energy levels before 10^-32 seconds after the Big Bang created X bosons and anti-X bosons. One hundred million of these X boson pairs instantly decay into one hundred million quarks and leptons, but only 99,999,999 anti-quarks and anti-leptons! So as this happened, the matter in the universe ballooned up to about 10^50 tons. At 10^-32 seconds the energy level had dropped to the point that no more X boson pairs were created. This asymmetry is what accounts for all the matter in the universe and evidence for it is found in what is called Charge-Parity (CP) violation.

    So there is really no need for reliance on chance.
  9. Sep 17, 2008 #8
    So does this mean that this theory may have some sort of credibility?
  10. Sep 17, 2008 #9
    The scientific method is really pretty brutal, because what we are looking for is the truth. That said, there are about 10^95 nuclear particles that make up the matter in the universe, each made of several quarks or leptons. You propose that at a strictly 50-50 chance ratio, each time the antiparticle fell in instead of the particle. So the odds of this happening would be one divided by the product of two multiplied by the total number of particles, or 1/(2*10^95), which is approximately: 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005% chance of happening naturally.
    I think that most people would consider this as not very credible. However, don’t be disheartened, Edison supposedly said “I haven’t failed I just discovered ten thousand things that don’t work.”
  11. Sep 17, 2008 #10
    hahaha alright I understand that. I recently emailed a professor from University of Chicago and he showed me a paper that I could read, entitled Matter-antimatter accounting, thermodynamics, and black-hole radiation, so I guess I will read that and see where I can go from there. Thanks for your input!
  12. Sep 18, 2008 #11


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    I don't think that is true, about the 50/50 chance. The part of the VPP that falls into the BH is always the antiparticle.

    Don't get me wrong, I am still pretty sure this is not the correct explanation for the predominance of matter, but the part about antimatter falling into micro-BH's is credible. Even the idea that these micro-BH's would have existed in abundance in the early universe is a fairly safe bet, along with the idea that they would evaporate quickly and release normal matter as they did so.

    Still probably not the right explanation, but nto bad speculating.
  13. Sep 18, 2008 #12
    What states that it is always the antiparticle? I didn't know that it was always the antiparticle. Thats pretty interesting.
  14. Sep 18, 2008 #13


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    This isn't true. What is true is that the particle that falls into the black hole is always the particle with 'negative energy,' but nothing states that this particle must be the antiparticle. Antiparticles and particles are emitted via Hawking radiation with equal probability.
  15. Sep 18, 2008 #14
    Remember, this is the early universe where the virtual particles were real due to the energy released by the separation of the Superforce, so the BH's don't need to radiate anything to absorb these particles. The premise is that all of the antimatter fell into the BH’s and none of the 10^50 tons of matter. That is where the 50-50 chance comes from. This really has nothing to do with Hawking radiation, its strictly 10^95 coin tosses coming up antimatter and no matter every time.
    Also, there is still no oservational evidence of Primordial BH's.
  16. Sep 18, 2008 #15
    what do you mean by negative energy?
  17. Sep 18, 2008 #16


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    This doesn't seem to be the argument proposed in the OP, though. Surely if one suggests that *all* the antimatter fell into black holes, then we should have a hell of a lot of PBHs knocking around!
  18. Sep 18, 2008 #17
    I'm saying that more antimatter may have fell into black holes than regular matter. Is this feasible?
  19. Sep 19, 2008 #18
    Cristo, there were basically three questions that Derek posed: where has all the antimatter gone; what if micro black holes produced by the tremendous energy at the big bang are the answer; and what if, by chance, antiparticles were absorbed by these micro black holes more than regular particles? I replied that the antimatter was asymmetrically produced by the decay of X boson pairs that resulted in a very small surplus of matter, that PBH had nothing to do with this process and that the chance that PBH absorbed all of the antimatter was practically zero. Derek, if you now want to say that just more antimatter fell in than matter that is a different question. How much more do you mean?
  20. Sep 19, 2008 #19
    Yeah, but....

    Could blackholes serve as an imbalance catalytic.
  21. Sep 19, 2008 #20
    Well, I'm not just going to throw out numbers. But I was wondering if perhaps just enough to produce an imbalance of matter and antimatter. Is there ANY speculation at all that black holes may prefer antimatter over matter? Has there ever been any papers posted on the subject that anyone may know of?
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