Goldstino en supersymetrie et en supergravite - mecanisme de super-Higgs

par M. Michel Rausch de Traubenberg (IPHC Starsbourg)

mardi 11 déc. 2012, 12:30 → 13:30 Europe/Paris

Bat 24, bibliotheque (IPHC)

In broken (global or local) gauge theories it appears a massless particle: the Goldstone boson. This massless particle remains in the spectrum in global theories although is eaten by the gauge boson in local theories. This is the Brout-Englert-Higgs mechanism. This mechanism extends naturally in supersymmetry or supergravity but now with a goldstone spin-1/2 fermion : the goldstino. In broken supergravity the goldstino gives mass to the gauge fermion of supergravity: the spin-3/2 gravitino. In supersymmetry it remains in the spectrum and corresponds to a massless fermion.

In this talk in the first part we recall the main feature of broken (local or global) gauge theories. In the second part, after having recalled the relevant part of supersymmetry and supergravity we analyse broken supersymmetry/supergravity. We then show that it appears a goldstino. Finally we stress the role of the goldstino in supergravity, with some special regards to the generation of the mass of the gravitino (super-Higgs mechanism).