Questions tagged [antimatter]
Analogous to matter, but with charge of the particles opposite to their ordinary matter counterparts.
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Matter-Antimatter Asymmetry a Product of Geometry? [on hold]
From what I understand about matter antimatter annihilation, is that heat and gamma radiation are released. From what I understand about the dynamic theory of the universe is that matter and ...
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1answer
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What direction would this photon go?
Say a matter-antimatter pair of particles annihilates linearly (from a reference frame where the sum of the momenta is zero) to create a photon.
Wouldn't momentum conservation prevent the photon from ...
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1answer
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Don't matter-antimatter annihilate each other completely releasing energy as photon?
Matter and antimatter should annihilate each other completely releasing energy in the form of photon, however it is discovered that smashing electron and positron together can also spew out higgs ...
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Is anti-sterile neutrino possible?
Due to the surplus of electron neutrino led people to suggest the possibility of 4th neutrino flavour, and it is thought to only interact with gravity and nothing else not even weak interaction. So is ...
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1answer
27 views
What would happen if antiprotons were studied under the conditions of particle deceleration that they are collected under? [closed]
I have not had a very clear understanding of how antiprotons are collected, but I do know that when they collide with matter they explode in a puff of energy. Or so I have been told. If the current ...
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1answer
56 views
Is it possible to transform energy stored in anti-matter into coherent radiation?
In Travellers, a sci-fi show on netflix, they have 10g of some form of anti-matter floating around. A quick $mc^2$ calculation gives a quantity of $E = 10^{15} J$. For reference, Little Boy released $...
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3answers
1k views
What happens to the quantum information of a particle and an antiparticle when they annihilate?
I understand that the quantum no-deleting theorem dictates that it's impossible to delete quantum information, so what happens to the quantum information of a particle and an antiparticle when they ...
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Do hydrogen and anti-helium annihilate one another? [duplicate]
So far I know that electron and positron annihilate each other completely and release energy, how about matter hydrogen atom with 1 proton and 1 electron come into contact with antimatter anti-helium ...
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2answers
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Corresponding particle-antiparticle solutions for Klein-Gordon equation
For free particle solutions in a box, the following 4 solutions are possible(Not all 4 are independent though) as
$$\psi_+=A_+ \exp{\frac{i}{\hbar}(px-Et)}\\\psi_+^*=A_+^* \exp{\frac{-i}{\hbar}(px-Et)}...
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1answer
43 views
Is the spin-statistics theorem true for antifermions?
The spin-statistics theorem says that having a system of identical fermions, the total wavefunction is antisymmetric with respect to exchange of any two fermions.
My question is, does this hold for ...
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2answers
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Is it possible to add energy to an antiparticle?
The title says most of it but the more drawn out version is. If you were to add energy to a single particle or antiparticle in a pair, what would be the effects, if it is possible to do.
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1answer
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One-loop diagram in scalar field theory
We see that this loop contain particle with momentum $p+k$ and anti-particle with momentum $k$.
But I fall into contradiction because the Feynman integral corresponds to this loop (see the book http:...
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1answer
54 views
Do antiquarks cancel quarks out?
I heard that antiquarks are just like antimatter. Does that mean that they cancel quarks out? If so, does that mean that there are more quarks than antiquarks?
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1answer
42 views
Is it possible for antimatter to be created from a nucleus of regular matter decaying?
I have a limited understanding of nuclear reactions. I know of the decay in which a positron is emitted from a nucleus and a proton is converted back into a neutron. There is also another type of ...
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2answers
54 views
Do antiparticles behave opposite of the particle?
If antiparticles have opposite charge to that of the particle, will their interaction be completely opposite?
For example, an electron and a proton are attracted to each other, will a positron and a ...
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1answer
60 views
In which direction does the positron's magnetic moment point?
Suppose I have an electron, with its spin pointing in some direction, so that the magnetic moment caused by the spin is pointing upwards. Then, I hold a positron next to the electron so that their ...
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1answer
174 views
Where is all the Antimatter?
This is obviously a duplicate of If matter and antimatter... However, it's now four to five years after a swarm of videos were made on this subject. At the time, there was a consensus that the LHC ...
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3answers
50 views
How is antimatter stored in the large hadron collider?
we studied that antimatter can be stored in the large hadron collider. what i dont get is that the collider is used to collide particles and antiparticles together right? so how is antimatter stored ...
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1answer
44 views
Is there a gravitational force among antiparticles? [duplicate]
Is there a gravitational force between antiparticles?
For example, between two antiprotons. Do the antiprotons repluse each other?
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Testing if antimatter is backwards-travelling matter?
I've read about how antimatter can be modeled as matter traveling backwards in time before but always viewed this as a sort of mathematical curiosity.
With this question I'm not so much asking if ...
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2answers
135 views
Is there such a thing as an anti-boson?
Can there be an anti-boson that when interacting with normal bosons, creates matter, like when anti-matter creates energy when interacting with matter?
I know that anti-particles can be considered ...
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1answer
68 views
Are positrons affected by electromagnetic fields?
I know positrons are anti-electrons. But electromagnetic fields aren't matter, and are pretty good for containing high energy particles, especially in something like a stellerator. So, would it be ...
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3answers
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Why don't we use positrons from beta plus radiation as a source of anti-electrons for energy?
Why can't we use the positrons (let off by beta plus radiation) as a source of anti-matter, such that we can collide it with an electron for 100% efficient mass to energy conversion?
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1answer
48 views
Does the positron prove that Dirac's electron sea must exist? [duplicate]
Does the fact that the positron exists in cosmic rays prove the existence of Dirac' s 'sea' of spin-paired electrons in space.
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1answer
163 views
So is it not $CP$ instead of $C$ that is responsible for changing a particle to its antiparticle?
The charge conjugation operator $C$ reverses the charge of a state. But it may or may not convert a particle to its antiparticle. For example, consider a neutrino which is charge-neutral and left-...
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1answer
138 views
Energy difference between enantiomers (matter/antimatter)
I am aware of the fact that enantiomers have different energies, for example L-amino acids have different energy than D-amino acids. The difference is not significant and is most usually about $10^{-...
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1answer
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Question about the spin of the antiparticle of $Δ^-$
Ι came across a statement in a physics book that the spin of the antiparticle of baryon $Δ^-$ is 1/2. I know that the spin for regular $Δ^-$ is 3/2, and - as far as I know - the spin of particles and ...
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1answer
111 views
How does something start interacting with the Higgs field?
When two high energy photons are smashed together they create a matter-antimatter pair. The photons do not interact with the higgs field, but when they convert into matter-antimatter pair, they start ...
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2answers
141 views
What is the exact relation between anti-matter and relativity?
I have seen in relativistic QM that, when trying to create the Dirac Equation, it only make sense to be acting on -- at minimum -- a 4-component vector (actually a bi-spinor). I guess this is because ...
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0answers
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Matter Anti-matter Imbalance
If both matter and antimatter could still 'pouring out', why do we assume that there is an overall Matter Anti-matter Imbalance? Could not antimatter possibly come out during a different time as ...
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1answer
141 views
The antiparticle of photon is itself
I'm not sure whether this question is redundant, but I think it is probably not due to the focus of the question.
We might say that photon does have antiparticle and it is photon it self. I know for ...
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1answer
40 views
Matter - antimatter collision [duplicate]
I have read that when matter and antimatter collide they just cancel out each other with the emmision of bright light. But doesn't it violate law of conservation of mass? If the the atoms dissapear ...
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1answer
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About the (retro)causality of an anti-atom
It is commonly said that one can view anti-matter as 'matter going back in time'. I'm trying to figure out how far this analogy goes.
For an atom, it is well-known how that atom excites absorbing a ...
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Can the existence of antimatter be inferred from Matrix Mechanics?
It is well known that Antimatter was first predicted by interpreting the matrices that show up in the Dirac Equation as indicating its existence.
Dirac factorizes $E^2=p^2+m^2$ ($c=1,\hbar=1$) into $...
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Is baryon asymmetry universal? [duplicate]
Baryon asymmetry takes it place on the Earth: it is almost impossible to find antimatter on the Earth, but matter occurs here and there. We ourselves are composed of matter and interact with matter to ...
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1answer
51 views
Antimatter: weak and strong forces
Antimatter is known to have equal mass to matter and opposite charge sign. Positron has the same mass as electron and opposite sign of charge, anti-proton has the same mass as proton and opposite sign ...
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1answer
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Anti matter of gravity [duplicate]
We all know that the fundamental particles to be controlling the electric and magnetic forces in our universe are obtained in pairs(electrons and protons, north pole and south pole.) Likewise I guess ...
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1answer
153 views
Why can there be only 3-particle vertices in Feynman diagrams? [closed]
Why can there be only 3-particle vertices in Feynman diagrams? For example, when a particle and its anti-particle annihilate to form two photons, why is its Feynmann drawn the way it is in diagram 2 (...
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2answers
169 views
Is the ground state energy of a quantum field actually zero?
I start by outlining the little I know about the basics of quantum field theory.
The simplest relativistic field theory is described by the Klein-Gordon equation of motion for a scalar field $\phi(\...
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1answer
55 views
Why is it necessary to introduce different sets of creation and annihilation operators to quantize the complex K-G field?
I am reading Peskin & Schroeder and in chapter 2 (p.21) he quantizes the real K-G field such as:
$$\phi=\int\dfrac{d^3p}{(2\pi)^3}\dfrac{1}{\sqrt{2E_p}}\left(a_pe^{ip·x}+ a^{\dagger}_pe^{-ip·x}\...
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Grand-canonical ensemble for antiparticles
For a system of interaction free identical fermions/bosons in thermodynamic equilibrium, the average number of particles in a single-particle state $i$ is given by,
$$n_i=\frac{1}{e^{\beta (\epsilon_i-...
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1answer
28 views
Lost potential energy?
If there are two electrons and a positron are in an closed system (not being influenced by gravity) all these have electromagnetic potential energy amongst them . if one of the electron then touches ...
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1answer
74 views
Endless electron-positron annihilation/creation?
We start the process with gamma rays collision that produces positron electron pair, the pair then annihilates when hit each other and gamma rays are produced again and everything repeats. Sure, in ...
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1answer
71 views
What happens to charged particle during the process of conversion from matter to antimatter? [closed]
During the conversion, there is a brief moment in which proton has no electric charge? (during the switch phase from plus to minus) Could it be that in this moment proton has no electromagnetic ...
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1answer
90 views
How to understand Hawking's interpretation of the quantization of the field?
In Hawking's paper "Particle Creation by Black Holes" he says the following:
The operator $\phi$ can be expressed as $$\phi=\sum_i f_i a_i+\bar{f}_ia_i^\dagger.$$
The solutions $\{f_i\}$ of ...
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2answers
299 views
What do the arrows on this Feynman diagram represent? [duplicate]
The picture follows the convention of the time axis being on the vertical direction.
I think this Feynman diagram represents Coulomb repulsion between two electrons with a virtual photon being ...
3
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1answer
48 views
Hawking Radiation specific clarification [duplicate]
If virtual particles on the edge of a black hole pop into existence randomly, wouldnt the likelyhood of a antiparticle generating on the inside of the black hole equal to a particle doing the same? So ...
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3answers
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Mathematical proof for antimatter?
I've heard (BBC Documentary Atom-The Illusion of Reality) that the Dirac Equation implies the existence of antimatter. Can someone tell me how that mathematical proof is done. Just for knowledge. ...
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2answers
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Forces involved in annihilation event
Combustion can create energy by breaking/creating bonds between atoms via the electromagnetic force to produce a resultant lower energy system. Nuclear fusion and fission processes can create energy ...
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1answer
92 views
How can there be single electron, while we observe many simultaneously?
Wheeler and Feynman's idea of single electron universe says that all the electrons and positrons are in fact a single particle bouncing forward and backward in time.
I don't get the nature of ...
