Analogous to matter, but with charge of the particles opposite to their ordinary matter counterparts.

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1answer
47 views

The interpretation of bubble and oyster Feynman diagrams?

I am reading 'A Guide To Feynman Diagrams in the Many Body Problem' By R.D.Mattuck, in which their is reference to oyster and bubble Feynman diagrams, shown respectively below. In these diagrams I ...
0
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1answer
103 views

Wave function of particle and antiparticle

The wave functions of particle and antiparticle are related by complex conjugation and wavefunction $Ψ$ must be complex for particle such as $n$, $p$. Is there way to prove this mathematically? Can we ...
19
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6answers
2k views

Why does matter/antimatter only produce gamma rays?

According to wikipedia, all antimatter annihilation produces gamma rays (along with potentially other elements). Why specifically Gamma rays? Why not electromagnetic waves of other wavelength?
3
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0answers
44 views

Large-scale antimatter production

From what I can find, presently the only known means of producing antimatter consist of directing particle accelerators at various targets, and only infrequently getting positrons or anti-protons as ...
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2answers
73 views

How are pions created?

I have listened to a lecture explaining the strong force which is actually nuclear force and colour force. And the pions are the force carrier of the nuclear force. And basically pions are created ...
11
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3answers
2k views

What actually happens when an anti-matter projectile collides with matter?

I'm trying to understand what would really happen when large quantities (e.g., 10g) of anti-matter collide with matter. The normal response is that they'd annihilate each other and generate an ...
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0answers
13 views

Quarks and pai-production [duplicate]

When Quark, antiuquark pair is created by high energy photons, they glue togheter as mésons or another pair is created to combine they, totalizing four particles? Following QCD both quarks would glue ...
2
votes
2answers
272 views

What's the symbol for the antiparticle of the $\Delta^+$ baryon?

It can't be $\Delta^-$ since that is another particle also made up of quarks (not antiquarks). I can think of four possibilities: $\overline\Delta^+$ $\overline{\Delta^+}$ $\overline\Delta^-$ $\...
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3answers
55 views

Could dark matter possibly be anti-matter?

Considering the broken symmetry after the big bang - what I understand as there being a huge surplus of matter and a lesser presence of anti matter - is it possible that dark matter could be anti-...
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2answers
476 views

Could anti-matter collisions be or make dark matter?

I've recently seen that space is or could be a quantum vacuum full of particles like matter and anti-matter appearing and possibly colliding causing in theory the same effects that dark energy has. My ...
5
votes
1answer
74 views

What happens to the electric field lines when an electron and positron collide? [duplicate]

A month back I began my course in classical electrodynamics. I know about the field lines of moving charges. But I have this question that if an electron and a positron are situated some distance ...
1
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1answer
33 views

How much realistically usable energy can be obtained from matter/antimatter interaction?

The high energy density of a matter/antimatter system is well known. However, depending on the nature of the material, most of the energy from the interaction is released in the form of photons (...
4
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1answer
166 views

positronium BEC stability

After reading this article regarding Positronium BEC formation (for lasing purposes), there is a mention in there regarding Ps "up" atoms not annihilating with "down" atoms, the article is pretty ...
0
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1answer
51 views

Would it matter if baryon asymmetry was the opposite?

If the quantity of matter of antimatter was switched, would it change anything?
6
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1answer
131 views

Can coherent superpositions of a neutron and antineutron exist?

In my recent post I learned that electric charge is always conserved in contrast to strangeness quantum number, which limits the types of Hadrons that can be build. Furthermore, also different masses ...
38
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1answer
2k views

Why was the first discovered neutrino an anti-neutrino?

In the search for neutrinos, Cowan and Reines discovered the electron anti-neutrino and named it as such. Why is the particle they discovered the anti-variety? The reason we call electrons 'electrons'...
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2answers
464 views

How can anti-matter annihilate matter?

I heard that anti-particles annihilate when in contact with normal-particles but the odd thing is that in fusion reaction normal-particles often "fuse" into each other but the weak force often ...
3
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2answers
117 views

How neutron can have an antiparticle since it have zero charge?

Antiparticles are defined as fundamental particles having the same mass but opposite charge. Now, a neutron has a particular mass (say m) , but zero charge ( =0). Its antiparticle should have mass=m ...
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4answers
417 views

How to guarantee that a kilogram of antimatter will quickly annihilate another kilogram of matter?

What I mean is, suppose we could somehow get a kilogram of antimatter and contain it safely. Now lets say we want to make a bomb using this kilogram, now, we have two ways, either store another ...
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2answers
49 views

Positron losing energy but is not destroyed

In August 1932, Anderson photographed a positron originating from cosmic rays as it entered a bubble chamber, passed through a 6mm lead plate (in the process loosing energy, as apparent from the ...
2
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0answers
28 views

Observationally distinguishing a galaxy of antimatter from a galaxy of matter [duplicate]

I was just wondering how, observationally, we would distinguish a distant galaxy of "normal" matter from one of antimatter. Maybe there is a simple answer but I don't see it. Once I started thinking ...
0
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0answers
32 views

What REALLY happens when matter and antimatter colide? [duplicate]

I've read on numerous websites that when 1 kg of matter collides with 1 kg of antimatter all the mass gets anhilated and converted into energy according to E = mc^2. I know this is the right "...
0
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3answers
608 views

Will Positron Cause flow of electricity?

Recently someone told me about antimatter. Antimatter is something that is completely opposite to matter. What I would like to know is let's say this universe was made of Anti-Matter. So since the ...
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1answer
62 views

Why can´t we call the energy released after the annihilation of a particle and its antiparticle `pure` energy? [closed]

As a particle and its antiparticle annihilate each other a huge amount of energy is released, and no mass is left. This energy always comes in the form of force mediating particles (photons, gluons). ...
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1answer
36 views

Do we mean with 'pure energy' the force-carrying particles? [closed]

I often read, hear and talk about pure energy. What is meant by this? Does pure energy consists of the forces between matter, or the force mediating particles, like the massless photons and gluon? I ...
4
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2answers
423 views

Why is it called “annihilation”?

The term "annihilate" literally means "turn into nothing". However, when a particle and antiparticle collide, they clearly do not turn into nothing; they simply transform into different particles. ...
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4answers
1k views

Neutron to antiproton decay

Would it be possible for a neutron to lose a positron and become an antiproton? Or would would it need to be the decay of an antineutron to antiproton instead?
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0answers
39 views

How much of fusion energy is positron-electron annihilation?

Stellar fusion involves protons becoming neutrons, which means ejecting a positron. Positrons annihilate electrons. This must deliver some energy in stellar fusion. But how much of the energy from ...
5
votes
1answer
405 views

Antiparticles, charge conjugation and chirality

(Why/how) are antiparticles and charge-conjugates different things? I am trying to understand the effect of discrete symmetries on spinor fields (neutrinos in particular). In the article, Dirac, ...
1
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1answer
26 views

Why do certain mesons not self-destruct? [duplicate]

As I understand it, particles and antoparticles annihilate one another. But some mesons (and pions?) consist of a quark and its antiquark. How can they exist without the two particles annihilating ...
2
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1answer
96 views

Is a Weyl fermion its own antiparticle?

Majorana fermions are their own antiparticles, and Weyl fermions are just Majorana fermions without mass. However, I haven't been able to find any source that says whether a Weyl fermion is its own ...
1
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1answer
90 views

How does the uncertainty principle relate to quantum fluctuations?

I found a webpage that just kind of mentions the uncertainty principle lightly but doesn't really go into detail as to why we need it in the first place when considering quantum fluctuations and ...
1
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3answers
82 views

Matter and Antimatter (Hypothetical question) [duplicate]

What will happen if we somehow create an "anti-sodium "element and react it with "hydrogen"(not anti)? I am specific about ANTI-SODIUM and HYDROGEN. Not just plain matter and antimatter.
11
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1answer
576 views

Why is the charmed eta meson its own antiparticle, but the neutral kaon is not?

I have a limited understanding of antiparticles, so this may be why I am unable to explain why certain mesons are their own antiparticles, while others are not. My understanding is that antiparticles ...
10
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1answer
1k views

If matter and antimatter repel, how do we know other galaxies aren't made of antimatter? [duplicate]

Wikipedia's article on antimatter says this: There is considerable speculation as to why the observable universe is composed almost entirely of ordinary matter, as opposed to a more even mixture ...
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0answers
32 views

What if a black hole of normal matter and a black hole of antimatter collided? [duplicate]

This is a curiosity question. Considering same mass black holes. As nothing can come out of either black hole, would the annihilation result into a black hole of energy? Assuming the two black holes ...
0
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1answer
41 views

One particle infinite manifestation universe [closed]

I know how non-intuitive everything related to quantum physics is and I was thinking on some very unintuitive things like John Wheeler one electron universe theory http://en.wikipedia.org/wiki/One-...
3
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1answer
47 views

Symmetry responsible for equality of masses of particles

During my studies of basic particle physics the following question came up. What symmetry is responsible for equality of masses of particles and their antiparticles? In particular, is this symmetry ...
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0answers
17 views

What might be the nature of gravitational force produced by the antimatters? [duplicate]

The proton and the electron is replaced by the anti-proton and the positron respectively from the conventional hydrogen atom in anti-hydrogen atom.
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0answers
25 views

Could an antimatter-dominated end of universe fix CPT?

My question is about the apparent CPT violation of the observed universe, due to the imbalance of matter and antimatter, but first I have a motivating observation: General relativity respects time ...
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votes
1answer
49 views

How likely I am to meet my antimatter self? [closed]

I read that, when a particle and it's corresponding particle of antimatter meet they annihilate and releases a large amount of energy. I also read that if I met my antimatter self and we Shook hand or ...
0
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0answers
23 views

Why are there presently more electrons than positrons in the universe? [duplicate]

After the Big Bang, when the universe was extremely hot, there was a symmetry in the population of electrons and positrons. But in the present universe we observe a large number of electrons and ...
1
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1answer
172 views

Does antimatter travel faster than light

I have read in the answers here that an electron traveling backwards in time would behave as a positron. I also read in another there that antimatter is matter traveling backwards in time As far as I ...
1
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2answers
51 views

Are there different kinds of antimatter reactions?

Obviously, when matter and antimatter collide, they annihilate. But how exactly and are all reactions the same? For example, what happens when a molecule of hydrogen meets a single pion? Does the ...
2
votes
2answers
58 views

Is a pion matter or antimatter?

It's made up of one quark and one antiquark. I can't seem to find anything that pays this question any attention? Also, what would be the antiparticle of it?
13
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2answers
4k views

If atoms never “physically” touch each others, then how does matter-antimatter annihilation happen?

It is known that matter and antimatter annihilate each other when they "touch" each other. And as far as I know, the concept of "touching" as our brain gets it is not true on the atomic level since ...
0
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1answer
72 views

Why does antimatter and matter fuse to release energy even though they will cancel each other perfectly?

I have seen many physics people talk about antimatter as a evil twin of matter and when they come in contact with each other leave massive amount of energy instead of only void. If antimatter and ...
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1answer
46 views

Can we in the far future have an energy source made from vacuum energy, antimatter, dark energy, Higgs boson? [closed]

Can we in the far future have an energy source made from vacuum energy, antimatter, dark energy, Higgs boson and all kind of these like stuffs?
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2answers
66 views

What is the Current Status of Measurement of the Gravitational Mass of Antimatter?

My current understanding is that it's generally expected (and has been predicted) that antimatter will fall down and not up in earth's gravity. But I haven't been able to locate any definitive ...
3
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1answer
78 views

If a neutrino and his antineutrino has different helicity how can it be a possibility that it is a Majorana particle?

All antineutrinos observed thus far possess right-handed helicity (i.e. only one of the two possible spin states has ever been seen), while neutrinos are left-handed. Notwithstanding that it is said ...