Questions tagged [antimatter]
Analogous to matter, but with charge of the particles opposite to their ordinary matter counterparts.
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Confusion about time reversion and the Feynman-Stuckelberg interpretation
The Dirac equation $(i\hbar\gamma^{\mu}\partial_{\mu}-mc)\psi(\mathbf{x},t) = 0$ admits solutions with positive and negative energies.
In the Feynmann-Stuckelberg interpretation we view negative ...
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Action of charge conjugation on bispinors
I'm following an introductory course to particle physics. We have introduced Klein-Gordon's equation for spinless particles and Dirac's equation for spin $1/2$ particles. Klein-Gordon's equation works ...
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How does special relativity lead to anti-particles?
Anti-particles and spinors pop out of the Dirac equation very naturally, yet the Dirac equation is only a modified version of the Schrödinger equation which includes the relativistic energy-momentum ...
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How to calculate mean energy of fluorine-18 positron?
I know that Fluorine-18 becomes stable when a neutron takes the place of a proton and becomes Oxygen-18 where a positron and nutrino are emitted.
Using Einstein formula, I can find the maximum energy (...
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Where is antineutrino in standard model Lagrangian?
I'm somewhat confused by the content I studied in Srednicki's work, where the neutrino is described as a Majorana field. In this framework, there shouldn't technically be antineutrinos, given the ...
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What if dark matter and anti-matter collided? [closed]
Considering we know both dark matter and antimatter can interact via gravity, just like regular matter, then that means the two can gravitationally interact. However,
since dark matter does not ...
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Is the matter-antimatter asymmetry a logical or a statistical problem?
When I read on Wikipedia about Big Bang (Inflation and Baryogenesis), I got the impression that in the beginning of the universe all matter and antimatter had been created exclusively as pairs:
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Do particle & anti-particle pairs belong to the same field?
When trying to understand the idea of virtual particles, the explanations for it seem to imply that, for example, electron-positron pairing happens within the fluctuating electron field, so does this ...
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Has anyone measured the energy output of matter/antimatter annihilation? [closed]
I've looked everywhere I can think, this side of paywalls, and everyone provides Feynman diagrams or $E=mc^2$ to describe or calculate annihilation. It occurred to me that virtual particles come into ...
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Would normal atoms and antimatter atoms be attracted to each other?
I believe I have been holding a misconception for a long time, surely dating back to some sketchy science fiction. I would like to verify what truth there is in this. Say you had person $A$ floating ...
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Average momentum of particle/anti-particle pairs
I'm far from an expert in physics, I've gathered bits from wiki, books and educational videos. So I apologize in advance if my question is not well framed or plain stupid.
It's about particle / anti-...
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Magnetic Monopoles and Its Antimatter and Mirror Particle Counterparts [closed]
I'm trying to understand how magnetic monopoles and how its potential mirror and antiparticle counterparts would behave. So according to the modified lorentz force law
$$\vec{F}=q_e\left(\vec{E}+\frac{...
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Relativistic Rocket Equation Derivation
Could somebody help me derive this equation?
$$\frac{\mathrm{d}M}{M}=-\frac{\mathrm{d}v(1-v_\mathrm{ex}\frac{v}{c^2})}{(1-\frac{v^2}{c^2})(-v_\mathrm{ex}\frac{v^2}{c^2}+(1-a)v+av_\mathrm{ex})}
$$
This ...
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Matter vs antimatter asymmetry per particle [duplicate]
What is called matter and what is called antimatter is just a convention, isn't it? For example, suppose we call the bottom, the charm and the down quark antimatter and we call the strange, top, and ...
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Lagrangian for a free antimatter particle
Context
The Lagrangian, $L$, of a free particle is derived many places including in Section 8 of Landau's Theory of Classical Fields. The well-known result for a free material particle of mass $m$ and ...
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