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Particles and Fields
Eur. Phys. J. C 27, 601-607 (2003)
DOI: 10.1140/epjc/s2003-01133-5

The spontaneous generation of magnetic fields at high temperature in a supersymmetric theory

V.I. Demchik and V.V. Skalozub

Dniepropetrovsk National University, 49050 Dniepropetrovsk, Ukraine


(Received: 18 October 2002 / Revised version: 23 December 2002 / Published online: 3 March 2003 )

Abstract
The spontaneous generation of magnetic and chromomagnetic fields at high temperature in the minimal supersymmetric standard model is investigated. The consistent effective potential including the one-loop and the daisy diagrams of all bosons and fermions is calculated and the magnetization of the vacuum is observed. The mixing of the generated fields due to the quark and s-quark loop diagrams and the role of superpartners are studied in detail. It is found that the contribution of these diagrams increases the magnetic and chromomagnetic field strengths as compared with the case of a separate generation of fields. The magnetized vacuum state is found to be stable due to the magnetic masses of gauge fields included in the daisy diagrams. Applications of the results obtained are discussed. A comparison with the standard model case is given.



© Società Italiana di Fisica, Springer-Verlag 2003