fermion
Pronunciation
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Pronunciation
- IPA: /ˈfɜːmɪɒn/
fermion (plural fermions)
- (particle physics, Standard Model) Any elementary or composite particle that has half-integer spin and thus obeys Fermi–Dirac statistics and the Pauli exclusion principle (equivalently, a particle for which the wavefunction of any system of identical such particles changes sign whenever two are swapped); a baryon, a lepton or a quark;
(slightly more loosely) any such particle or any composite particle composed of fermions.- The fermions treated by the Standard Model are the (composite) baryons and the (elementary) leptons and quarks.
- According to the spin–statistics theorem, the wavefunction of a system of identical fermions (particles of half-integer spin) is antisymmetric under the operation of swapping any two particles.
- 1994, István Montvay, Gernot Münster, Quantum Fields on a Lattice, Cambridge University Press, page 208 ↗,
- A remarkable feature of lattice regularization is the appearance of several fermion species per fermion field in the lattice action.
- 1996, Georges Bouzerar, Didier Poilblanc, Persistent Currents in Interacting Electronic Systems, T. Martin, G. Montambaux, J. Trân Thanh Vân (editors), Correlated Fermions and Transport in Mesoscopic Systems, Editions Frontieres, page 149 ↗,
- For 2D systems, going beyond first order pertu[r]bative calculations, we show that the second harmonic of the current is strongly suppressed in the case of spinless fermion models but significantly enhanced for the Hubbard model.
- 1996, Georg G. Raffelt, Stars as Laboratories for Fundamental Physics, University of Chicago Press, page 253 ↗,
- It is not known whether the Higgs mechanism is the true source for the masses of the fundamental fermions.
- French: fermion
- German: Fermion
- Italian: fermione
- Portuguese: fermião (Portugal), férmion (Brazil)
- Russian: фермио́н
- Spanish: fermión
This text is extracted from the Wiktionary and it is available under the CC BY-SA 3.0 license | Terms and conditions | Privacy policy 0.003