Questions tagged [magnetic-monopoles]
A magnetic monopole is a hypothetical particle with only one magnetic pole. Their magnetic fields would not be divergence-less. Predicted by certain modern theories, including string theory, supergravity, and various popular grand unified theories.
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A list of failed attempts towards a proof of confinement [closed]
Can one give a list of failed or open attempts (not necessarily Supersymmetric) towards a proof of confinement in 4d regarding YM or QCD?
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Magnetic monopole in CPT universe model
I've recently read this paper CPT universe, and a thought came into my mind.
Is it possible to discuss magnetic monopole based on this CPT universe model?
This paper points out that some mysterious ...
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Is there an estimate for how many monopoles would be produced in the very early universe?
The question really hits it with this one. I haven't really found some good numbers other than the whole “It'd be so many (per Hubble vol) to recollapse the universe”. I don't know if that comes of as ...
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How to describe the dynamics of a magnetic monopole charge in the external EM field using a Lagrangian in terms of the EM potentials?
The equation of motion of a magnetic charge in the fixed external electromagnetic field $\mathbf{E},\mathbf{B}$ is
$$
\frac{d}{dt}(\gamma m \mathbf{v})=q_m(\mathbf{B}-\mathbf{v}\times\mathbf{E}),
$$
...
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Dirac's quantisation condition and non-quantised charge
After some time searching for a convincing demonstration of the Dirac quantisation condition, I've finally come across not one but three of them in David Tong's book: Gauge Theory. Nonetheless, it all ...
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Reformulation of Maxwell's equations in the event of finding a magnetic monopole
If we ever obtain empirical confirmation of the existence of magnetic monopoles, how would Maxwell's classical equations be re-written? I'm assuming we'd only need to set the divergence of the ...
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Question about magnetic and electric monopoles
Suppose magnetic monopoles existed. If you had two monopoles, electric and magnetic, what test would you apply to distinguish one from the other?
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How would a magnetic monopole behave around a live wire?
Given a direction of current in a wire, and the magnetic field perpendicular to the wire forms with say "north" pointing clockwise (right-hand-rule convention). If we placed a small monopole ...
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How does the polarity of the magnet changes when flipped upside down? What happens to the direction of magnetic domains and magnetic line of force?
Imagine you have two flat bar magnet with dimensions as $L \times B \times H = 100 \times 50 \times 5$ each. The $B \times H$ side of magnet 1 is facing the $B \times H$ side of the magnet 2. And let'...
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Dirac strings are classically observable through induction?
For my Masterthesis I will have to dive a bit into Dirac monopoles, which are said to be pairwise connected by a Dirac string which is just an infinitesimal fiber carrying magnetic flux $|\vec{B}|=g$. ...
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Why is Magnetism at the centre of a bar magnet zero?
I have seen some sources saying
"Magnetism at the centre of a bar magnet is zero."
and Some sources say
"Magnetic field at the centre of a bar magnet is zero."
Please help me ...
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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
$$\vec{F}=q_e\left(\vec{E}+\frac{...
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Is it possible for electroweak monopoles to catalyze electroweak burning?
Given that both electroweak monopoles and the Sphaleron process involve the non-trivial aspects of electroweak interactions, I am curious about whether there is theoretical or experimental evidence to ...
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Magnets in 2 Spatial Dimensions?
In 2+1 dimensions of spacetime, the electromagnetic field is made up of a vector electric field and a scalar magnetic field. At each point in space, there is a magnetic field value, which we can ...
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Vector potentials that give monopole magnetic fields with good properties [duplicate]
I am looking for a vector potential
$$\mathbf{A}=(A_x,A_y,A_z)$$
giving a monopole magnetic field
$$\mathbf{B}=\mathbf{\nabla}\times \mathbf{A}= g\frac{\mathbf{r}}{r^3} = g \left( \frac{x}{r^3}, \frac{...
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