Bonn 2010 – wissenschaftliches Programm
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GR: Fachverband Gravitation und Relativitätstheorie
GR 5: Hauptvorträge Dienstag: Weltraummissionen
GR 5.3: Hauptvortrag
Dienstag, 16. März 2010, 09:50–10:30, JUR K
Towards a One Percent Measurement of Frame Dragging by Spin with Satellite Laser Ranging to LAGEOS, LAGEOS 2 and LARES and GRACE Gravity Models — •Ignazio Ciufolini1, Antonio Paolozzi2, Erricos Pavlis3, John Ries4, Rolf Koenig5, Richard Matzner6, Giampiero Sindoni2, and Hans Neumayer5 — 1University of Salento and INFN, Lecce, Italy — 2Sapienza University of Rome, Scuola di Ingegneria Aerospaziale, Rome, Italy — 3University of Maryland, Baltimore County, Baltimore, USA — 4University of Texas at Austin, Center for Space Research, Austin, USA — 5GFZ German Research Centre for Geosciences, Potsdam, Germany — 6University of Texas at Austin, Center for Relativity, Austin, USA
During the past century Einstein's theory of General Relativity gave rise to an experimental triumph; however, there are still aspects of this theory to be measured or more accurately tested. Today one of the main challenges in experimental gravitation, together with the direct detection of gravitational waves, is the accurate measurement of the gravitomagnetic field generated by the angular momentum of a body. Here, after a brief introduction on frame-dragging and gravitomagnetism, we describe the measurements of frame-dragging by the Earth spin, with an accuracy of approximately 10%, using the satellites LAGEOS, LAGEOS 2 and the Earth's gravity models obtained by the GRACE project. We then present the LARES experiment to be launched in 2010 by the Italian Space Agency for a measurement of frame-dragging with an accuracy of a few percent.