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Mathisson's helical motions for a spinning particle: Are they unphysical?
Costa, L. Filipe; Herdeiro, Carlos; Natario, Jose; Zilhão, MiguelIt has been asserted in the literature that Mathisson's helical motions are unphysical, with the argument that their radius can be arbitrarily large. We revisit Mathisson's helical motions of a free spinning particle, and observe that such statement is unfounded. Their radius is finite and confined to the disk of centroids. We argue that the helical motions are perfectly valid and physically equivalent descript...
Electromagnetic and Gravitational Invariants
Costa, L. Filipe O.; Herdeiro, Carlos A. R.; Wylleman, LodeThe curvature invariants have been subject of recent interest in the context of the experimental detection of the gravitomagnetic field, namely due to the debate concerning the notions of "extrinsic" and "intrinsic" gravitomagnetism. In this work we explore the physical meaning of the curvature invariants, dissecting their relationship with the gravitomagnetic effects.
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