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

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

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
32 views

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

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 ...
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0answers
42 views

Antimatter in the solar system, Charge of the sun, and Annihilation

Since the sun is creating a lot of helium at once, and one of the protons has to undergo beta plus decay, Shouldn't there be at least a little bit of antimatter orbiting the sun? I know most of the ...
4
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2answers
390 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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34 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
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1answer
358 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
22 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
76 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
79 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
80 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
553 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 ...
1
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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
40 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 ...
3
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1answer
45 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.
0
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0answers
16 views

Can energy be organised into elemental form other than hydrogen?if yes,then how?

I wanted to know whether energy can be organised into elemental form easily. If is so then , can antimatter be generated in a similar way other than pointing high intensity laser at some metal foils ...
1
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0answers
24 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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1answer
46 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
135 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
48 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
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2answers
54 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?
12
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2answers
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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
65 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
40 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
63 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
62 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 ...
2
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1answer
160 views

Does LIGO GW detection methodologically constitute discovery of two specific black holes (as astronomical objects)? [duplicate]

It is said that the gravitational waves (GW), recently detected by LIGO, correspond (according to Einstein General Relativity theory equations) to the effect of two black holes merging (with the ...
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4answers
165 views
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4answers
99 views

Theoretical Possibility of “Opposite” Gravitational Mass? [duplicate]

This is an unusual idea that I have been entertaining for some time, and I can't find anything about it online. However, it is so simple that someone must have conceived it before. First, I will ...
1
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1answer
35 views

What is the likelihood of pair production for a high energy photon?

Wikipedia says that pair production is the dominant form of light-matter interaction for photons with a mass equivalence of at least twice the rest mass of the target particle, implying that not all ...
1
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1answer
54 views

Any Antimolecule so far?

As i've been reading on Wikipedia, we are artificially able to join an antiproton with a positron to form an antihydrogen. But if i search for antimolecule, i can't find any results on that, only a ...
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2answers
547 views

How are anti-matter atoms created?

What is the reaction, or reactions that make anti-matter? I don't understand how anti-matter is created by CERN if interaction with normal matter causes annihilation.
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1answer
1k views

Is there any antimatter that exists as atoms?

I recently read a few things that implied that there is antimatter that we know of (have created?) that exists as atoms - which I guess means positrons and antiprotons bound together, at least. Is ...
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2answers
104 views

Is there a natural source of Antimatter in this universe?

I was just asking if there is an natural source of Antimatter in this universe capable of creating simple molecules/compounds? So, any good answers?
0
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0answers
26 views

Black hole starship: Would micro black-hole Hawking radiation emit anti-matter?

My understanding of Hawking radiation is that virtual particle pairs of matter and anti-matter are created from vacuum energy and one of those virtual particles may escape while the other enters the ...
0
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1answer
106 views

Conversion of energy to matter or antimatter?

We all know that matter converts into energy, but will energy convert into matter? Does it form antimatter by converting? Illustrate me with example.
9
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3answers
246 views

What exactly “triggers” a matter/antimatter detonation?

I know that when matter touches antimatter, they both explode and turn into energy. However, by my understanding, atoms don't really touch; their nuclei don't physically contact each other, since ...
1
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0answers
29 views

Accelerating antielectrons [closed]

I just signed up to the site. I am not a physicist, but I find physics fascinating. My understanding and knowledge is very little. I was doing some reading on Alpha collaboration < ...
29
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1answer
1k views

How close does a particle-antiparticle pair need to be for annihilation to happen?

I've most often seen the statement that the annihilation of a particle and its antiparticle occurs when they 'collide' with one another. So in other words when they get very close to one another ...
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2answers
50 views

Can Acoustic levitation be used to contain antimatter?

Can Acoustic levitation be used to contain antimatter? To me, It sounds like an obvious use of the phenomenon, but I didn't find any documentation about anyone trying this on the web, which could ...
10
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3answers
463 views

Are there models/simulations of antigravitational antimatter-galaxies?

In the comments to another question's answer, I started wondering: Assuming antimatter possessed negative gravitational mass§ (which is not proven impossible to date, though deemed unlikely), ...
4
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1answer
54 views

Electron-Positron Annihilation in a Gravitational Field

When an electron and positron annihilate what happens to any gravitational energy they have? In a way the energy is 'shared' between these two particles and all the matter in space. It must take a ...
2
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1answer
101 views

Why don't antiparticles have antispin?

Antiparticles are often said to particles moving backwards in time. However if they are moving backwards in time shouldn't they also "spin backwards", meaning they should have negative or antispin? ...
6
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3answers
3k views

Why does electron-positron annihilation prefer to emit photons?

If gravitons are also massless, and neutrinos nearly so, why aren't pairs of either of them normally expected outcomes of electron-positron annihilations? Are they possible but simply unlikely, or is ...
0
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1answer
49 views

How often does photons morph into matter and antimatter?

We know that matter-antimatter collisions are reducing the two into pure energy or photons. Similarly the reverse is possible where a photon can spontaneously morph into two equal particles of matter ...
0
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1answer
18 views

Is Light Amplification Synchronise Electron/Positron Radiation possible?

Light Amplification Stimulated by Emission of Radiation vs Light Amplification by Sychronised Electron/Positron Radiation By applying a "custom" undulator(a series of powerful magnets) to break up ...
0
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1answer
36 views

Under what conditions can a positron exist in everyday conditions?

I am still learning basic quantum field theory and I am curious in what circumstances could a positron exist as a stable particle like an electron or proton, say for example in a human body or a ...