Francis Everitt: 90 Years on - The Long Path to Measuring Frame-dragging Mitschnitt einer Veranstaltung des Wiener Physikalischen Kolloquiums am Montag, dem 13. Oktober 2008 im Großen Hörsaal des Instituts für Experimentalphysik der Universität Wien Mit einleitenden Worten von Anton Zeilinger (Dekan der Fakultät für Physik) Schnitt: Johannes Sauer Abstract: In 1918, Josef Lense and Hans Thirring showed that in Einstein’s beautiful new theory of gravitation, general relativity, rotating matter exerts a dragging effect on the framework of space-time. They calculated the magnitudes of expected effect on satellites in orbit around rotating planets. This lecture describes how, finally, 90 years later, the NASA Gravity Probe B mission, launched 20 April 2004, has provided a decisive measurement of the closely related effect on gyroscopes in earth orbit, first calculated by Leonard Schiff. The gyroscopes required a performance 107 times better than the best inertial navigation gyroscopes. Developing them and the many other new technologies for the mission proved a fascinating and sometimes daunting task, including a three-way collaboration between Stanford University, aerospace industry and NASA. The contributions of students, both physics and engineering, have been extraordinarily impressive. The talk concludes with some observations on the wider significance of the GP-B experience. Francis Everitt ist Leiter des Gravity Probe B-Experiments zum Test der allgemeinen Relativitätstheorie. INHALT ====== Kapitel Titel Position --------------------------------------------------------------------- 1. Vorspann 00:00:00 2. A. Zeilinger: Introductory remarks 00:00:09 3. Concept of the experiment 00:04:51 4. The gyroscope. Classical drift 00:12:36 5. The star tracker. Matching and calibration 00:22:18 6. Launch and orbiting 00:26:07 7. Ultra-low pressure 00:33:02 8. The patch effect. Flux mapping 00:41:00 9. Results 00:49:30

Relativitätstheorie, Experiment

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