# Tag Info

## New answers tagged magnetic-monopoles

1

This answer is based on David Tong's lectures on solitons - Chapter 2 - Monopoles. The general answer to the question is that it is known how to construct a quantum mechanical theory of magnetic monopoles acting as individual particles among themselves and also perturbatively in the background of the standard model fields. t' Hooft - Polyakov monopoles ...

1

Theories with fundamental quarks which experience spontaneous chiral symmetry breaking: $$SU_L(N_f) \times SU_R(N_f) \rightarrow SU_A(N_f)$$ ($N_f$ is the number of flavors) (This is the observed approximate symmetry breaking in nature where the pions are the approximate Goldstone bosons). In contrast, theories with adjoint quarks experience the chiral ...

2

I am not sure if I know the correct answer (as I am a student my self), but I will try (and if I am wrong, someone please correct me). The first thing that took me some time to figure out is what they mean by adjoint representation. In Georgi's book he defines the adjoint representation of a generator as: [T_i]_{jk} \equiv -if_{ijk} ...

2

It depends on the non-trivial topological solution of the equations of motion under consideration. The most famous example is the 't Hooft–Polyakov monopole (see http://en.wikipedia.org/wiki/%27t_Hooft%E2%80%93Polyakov_monopole) which has the following solution: $$\phi = h \frac{x^a} {r} t^a$$ A_0=0 ...

2

This is almost, but not quite, a duplicate of What tree-level Feynman diagrams are added to QED if magnetic monopoles exist?. In principle quantum electrodynamics includes magnetic monopoles as well as electrons, so yes we do have a theory to describe them. However we expect monopoles to be many orders of magnitude heavier than electrons, and that causes ...

1

Yes, in the absence of magnetic monopoles, every magnet must have a north and south pole.

0

You van have two pairs of north/south if you wish.

-1

I believe if you start with a flat magnet then press it into a semi sphere, I say semi because you want a hole in it, the hole you will role in on itself to form an inner lip creating a third semi sphere effect. As long as you have that hole I figure it will weaken the inner pole enough to give you a mono pole effect. The effect would be sufficient enough ...

2

I work on an experiment that involves trying to create magnetic monopoles in a type of material called a spin ice (Dy2Ti2O7) so called because its spins obey the same rules as ice water. The interesting part of the structure is a tetrahedra of rare earth atoms where in the ground state you have two spins pointing in and two spins pointing out across its four ...

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