Antimatter...What exactly is this theory?
829810
Imagine an atom where the protons have a negative charge, and the electrons have a positive charge.  That's antimatter.  Minute quantities have been created in the laboratory, but it has to be stored in a magnetic bottle, since any contact with normal matter causes the antimatter and an equal quantity of matter, to be converted to energy.
339006
To the extent that there was a conflict, it was resolved by Dirac. His was a quantum theory that directly included relativistic invariance. His equation is now the basis for our understanding of relativistic electrons. As of now, we don't have a way of reconciling quantum theory and *general* relativity, though.
231248
The clue is in your question:  "We find."  How do you know what becomes of antiparticles we don't find?
486183
I find it to be quite fascinating.  Although mind-bending as well (11 dimensions - my brain hurts just thinking about it).  I don't know if it is correct or not (well, no one knows for sure), but it seems to have potential, particularly with resolving the Relativity/Quantum Physics battle.
9631
I suppose you are referring to galaxies composed entirely or at least mostly of antimatter. None have been observed. If there were any, it would certainly be coming into contact with large amounts of matter at some sort of boundary. At that point, the collisions of the two would set off gigantic amounts of gamma rays, which we would be able to see. These have not, however, been observed. This is likely due to the fact that, for some reason as yet unknown, the amount of matter has increased hugely in the universe relative to antimatter since the big bang.
475479
here's my guess --\nthat these particles are somehow "connected" . that they do not violate casuality (this one is proveable) or locality....somehow.
214575
It is true that nobody knows. It is false that theories on the origin of matter are wild speculations. See an earlier post I did today on an almost identical question for a reasonable theory for the origin of matter out of nothing.\n\nIn short, the fact is that matter appears out of nowhere all the time. There's is no reason to think it could not do a slightly more extreme version of the same thing if the vacuum state were changed a little bit, ie. its energy density was increased.
71348
The last I heard the existence of antimatter was an observed fact.  Positrons and the like are routinely created at the CERN supercollider in Switzerland.  The part over which scientists remain undecided is whether antimatter occurs naturally in the universe or if it is just a curiosity which only occurs in particle colliders.
160542
Remember back 60 years ago? The times when traveling at the speed of sound is considered impossible? Or 50 years ago, when people would laughed at you if you were talking about landing man on the moon?\n\nMany impossibles yesterday becomes our daily routine today. \n\nTravelling at the speed of light or faster than that will be our reality in the future. Mankind will develop energy source huge enough to propel us at warp speed, and anti-inertia technology to keep us in one piece. \nFor instance, the fussion of matter and anti-matter. This is not science fiction guys, anti-matter does exist. \n\nWhen matter and anti-matter collides, transforming all its mass into pure energy, it releases far bigger energy than that of a nuclear energy. Antimatter is the perfect fuel. And as we speak, there are hundreds of man and women at NASA working day and night trying to convert them into controlled energy.\n\nNever say Impossible...
68885
I think that simple answer is, no one knows. We have theories, but we really do not know. \n\nFor example, maybe the antimatter particles decay much faster (see reference). Maybe the universe is only locally mainly matter, and there are other patches of the universe that are locally mainly antimatter (see reference). \n\nWhat science is, is a series of problems and questions that scientists attempt to answer. You have asked one of those questions that is so far, in the unresolved category.
1090798
Actually astronomers and physicists are really quite puzzled by the whole universe.  They have absolutely no idea what the dark matter is.  Some postulate that it is neutrinos, even though they have not be able to show that neutrinos have mass. And they do not know if the expansion will stop or not.  At the moment it appears that it will not but they are not certain. They do not know even why the matter of the universe has congealed into galaxies instead of a uniform soup. They have concocted elaborate hypotheses as to why, but they are still puzzled.\n\nAnd best of all is why is there no anti-matter except in labratories?\nWhy did it not cancel out all the matter to begin with?
468986
Ah, the wonders of proving reality to a disbeliever!\nFirst, I want you to visit http://en.wikipedia.org/wiki/Introduction_to_special_relativity , and try to teach yourself whatever they're talking about, okay? \nNext, I know this is unprovable, but I have my own distinct thoughts and imaginations and feelings and beliefs, and if nothing else, can assure you that I am, in fact, quite real.\nFind that page yet? Good. Do you understand the math? If so, kudos, go on to the main Special Relativity or General Relativity pages. If not, do you see where I'm heading with this?\nThis world we live in, grass and garbage and math and all, is much too complex for you to dream! The human mind is capable of miraculous things - but it can hardly invent hundreds of thousands of sciences and religions and people, and keep them all straight, and create histories and backgrounds and politics for each.
24565
Antimatter or contra-terrene matter is matter that is composed of the antiparticles of those that constitute normal matter. If a particle and its antiparticle come in contact with each other, the two annihilate and produce a burst of energy, which results in the production of other particles and antiparticles or electromagnetic radiation. In these reactions, rest mass is not conserved, although (as in any other reaction) energy (E=mc²) is conserved.\n\nScientists in 1995 succeeded in producing antiatoms of hydrogen, and also antideuteron nuclei, made out of an antiproton and an antineutron, but no antiatom more complex than antideuterium has been created yet. In principle, antiatoms of any element could be built from readily available sources of antiparticles. Such antiatoms would have exactly the same properties as their normal-matter counterparts. The production of antielements in bulk quantities seems unlikely to ever become achievable, however.\n\nPositrons and antiprotons can individually be stored in a device called a Penning trap, which uses a combination of magnetic field and electric fields to hold charged particles in a vacuum. Two international collaborations, ATRAP and ATHENA, used these devices to store thousands of slowly moving antihydrogen atoms in 2002. It is the goal of these collaborations to probe the energy level structure of antihydrogen to compare it with that of hydrogen as a test of the CPT theorem. One way to do this is to confine the antiatoms in an inhomogenous magnetic field (one cannot use electric fields since the antiatoms are neutral) and interrogate them with lasers. If the anti-atoms have too much kinetic energy they will be able to escape the magnetic trap, and it is therefore essential that the anti-atoms be produced with as little energy as possible. This is the key difference between the antihydrogen that ATRAP and ATHENA produced, which was made at very low temperatures, and the antihydrogen produced in 1995 which was moving at a speed close to the speed of light.\n\nAntimatter/matter reactions have practical applications in medical imaging, such as positron emission tomography (PET). In some kinds of beta decay, a nuclide loses surplus positive charge by emitting a positron (in the same event, a proton becomes a neutron, and neutrinos are also given off). Nuclides with surplus positive charge are easily made in a cyclotron and are widely generated for medical use.\n\nAntiparticles are created everywhere in the universe where high-energy particle collisions take place, such as in the center of our galaxy, but none has been detected that is residual from the Big Bang, as most normal matter is.[1] The unequal distribution between matter and antimatter in the universe has long been a mystery. The solution likely lies in the violation of CP-symmetry by the laws of nature; see baryogenesis.\n\nhow much produced it is on and on and on
687307
haha... That reminded me of man in black, they have a similar concept there, especially at the end with the two aliens. I'm not sure what you mean by splitting the world, but I get the idea. I think there's some chance to that being true, but if atom is the very basic matter that everything is made out of, and it has only 3 diff. sub-particles then it would be sort of hard to have a whole universe contained in there? In that case what does the proton, neutron, and electron play in the whole thing?
1003312
The bible could be the place where he got his theory, but unlikely.  The theory that anti-matter exists comes from the big bang theory, which is comes out of scientific thought that there could be another explanation to our existence.  The liklihood that someone would come up with a different explanation using someone elses is small.  And anti-matter is a pretty far-fetched theory with no observable, reproducible, reproductions of anti-matter.
840202
If you increase the energy density (temperature) of a volume of space, particles therein collide with each other at higher speed. If things get hot enough, the collisions result in particle-antiparticle pair creation and annihilation. The hotter it gets, the fast and more numerous the particles become. The BB was a hot soup of such particles early on and, as it cooled, particles stable at low temperature were all that were left (by definition, duh). That includes the fermions we all know and love. The details of why there were apparently a net number of matter vs. antimatter particles left over is still being worked out.
480431
Yes. Part of the idea of antimatter is in some equations containing squares, to solve for that variable you must have a positive and negative answer. Therefore an opposite or anti- thing must exist. Antimatter in this case. So if the E=mc^2 works for matter than it should work for anti-matter.\n\nHowever, as the theory of antimatter states - rather than be like matter where something travelling the speed of light can produce matter and mass, the antimatter will become energy and destroy mass when it comes in contact with matter. \n\nHope that makes some sense. Antimatter is an annoying thing.