Prof. Dr. Andrej Čadež (FMF): Stellar magnetism and variational principle

Magnetars and pulsars are known for their extreme magnetic field. However, magnetism seems to be the common attribute of almost all other astrophysical objects. Can this universality of astrophysical magnetism be related to the other universal principle, that of least action? We derive (simplified) stellar structure equations from a variational principle minimizing the total energy of a star including magnetic energy. Does the simplest possible realization of this model, that of incompressible magnetic fluid, present a clue for a plausible explanation of astrophysical magnetism?
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