München 2006 – wissenschaftliches Programm
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GR: Gravitation und Relativitätstheorie
GR 202: Experimentelle Tests
GR 202.5: Vortrag
Dienstag, 21. März 2006, 15:40–16:00, K
String-Motivated Torsion Effects on Spin Precession — •Thorsten Feldmann1, Robert Graham1, Axel Pelster1, and Urs Schreiber2 — 1Fachbereich Physik, Universität Duisburg-Essen, Universitätsstraße 5, 45117 Essen, Germany — 2Zentrum für mathematische Physik, Bundesstraße 55, Universität Hamburg, D-20146 Hamburg, Germany
In the low-energy limit string theory predicts that Einstein’s gravitation theory is modified by the occurrence of the Kalb-Ramond and the dilaton field. At first, we show that all these string-inspired gravitational fields can be considered as constituents of a Riemann-Cartan differential geometry. Then we analyze in detail how a constant torsion tensor, induced by a Kalb-Ramond field, modifies the equations of motion of a classical particle with spin in a flat space-time, leading, for instance, to a precession of a myon spin in a storage facility. Such effects might be candidates for an explanation of the current discrepancy between the predictions of the standard model of elementary particle physics for the anomalous magnetic moment of the myon and the recent precision measurements at Brookhaven National Laboratory.