A **magnetic monopole** is a hypothetical particle in particle physics that is an isolated magnet with only one magnetic pole (a north pole without a south pole or vice-versa). In more technical terms, a magnetic monopole would have a net "magnetic charge". Modern interest in the concept stems from particle theories, notably the grand unified and superstring theories, which predict their existence.

Magnetism in bar magnets and electromagnets does not arise from magnetic monopoles, and in fact there is no conclusive experimental evidence that magnetic monopoles exist at all in the universe.

Effective (non-isolated) magnetic monopole *quasi*-particles exist in some condensed matter systems.

Read more about Magnetic Monopole: Poles and Magnetism in Ordinary Matter, Maxwell's Equations, Dirac's Quantization, Grand Unified Theories, Searches For Magnetic Monopoles, "Monopoles" in Condensed-matter Systems, Appendix

### Other articles related to "magnetic monopole, monopoles, magnetic":

**Magnetic Monopole**- Appendix

... In physics the phrase "

**magnetic monopole**" usually denoted a Yang–Mills potential A and Higgs field ϕ whose equations of motion are determined by the Yang ... equations and the boundary conditions Pure mathematical advances in the theory of

**monopoles**from the 1980's onwards have often proceeded on the basis of physically motived questions ... R3 to an adjoint orbit G/k and the homotopy class of this mapping is called the

**magnetic**charge ...

... The

**magnetic**Aharonov–Bohm effect is also closely related to Dirac's argument that the existence of a

**magnetic monopole**can be accommodated by the existing

**magnetic**source-free Maxwell's equations if both ... A

**magnetic monopole**implies a mathematical singularity in the vector potential, which can be expressed as a Dirac string of infinitesimal diameter that contains the equivalent of all of the 4πg ... The Dirac string starts from, and terminates on, a

**magnetic monopole**...

### Famous quotes containing the word magnetic:

“We are in great haste to construct a *magnetic* telegraph from Maine to Texas; but Maine and Texas, it may be, have nothing important to communicate.”

—Henry David Thoreau (1817–1862)