Abstract
A geometric approach based on the chronoinvariance group introduced by Zelmanof (1956) and Cattaneo (1958) is used in order to describe the behaviour of superconductors in arbitrary external gravitational and electromagnetic fields. In this manner the physical interpretation of the equations obtained with respect to a chosen reference frame is automatically achieved. The starting point is a model of a superconductor which is manifestly covariant and gauge invariant within a generalisation of the London (1950) and Ginzburg-Landau formulation. In the weak-field approximation and for a stationary gravitational field the London-DeWitt and Schiff-Barnhill effects (1966) are recovered.
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