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Gravitational Physics Experiments in Space (S. Buchman, Stanford University)

Oct. 08 - 22:00 - 2010

<p>Abstract:  <!-- @page { margin: 0.79in } P { margin-bottom: 0.08in } --> </p><p style="margin-bottom: 0in" align="JUSTIFY">We present the motivation behind gravitational physics space science programs. </p> <p style="margin-bottom: 0in" align="JUSTIFY">The Relativity Mission, Gravity Probe B (GP-B), was launched in April 2004 and has completed science data acquisition in September 2005. Mission goal was to measure the frame dragging (gravitomagnetic) and geodetic (gravitoelectric) effects in a 642 km polar orbit to an accuracy of 10<sup>-2</sup> and 10<sup>-4</sup> respectively. Data analysis has proven more complex than planned due to larger than expected patch effects; we present preliminary results, with the final results to be released January 2011.</p> <p style="margin-bottom: 0in" align="JUSTIFY">The Space Time Asymmetry Research program (STAR) represents a paradigm shift for fundamental physics experiments in space. The program is based on small secondary-payload satellites of about 150 kg and 150 W and uses technology well proven on the ground. A series of three missions of about six years total duration each and overlapping by about two years will probe with repeatedly increased accuracy Lorentz invariance and General Relativity parameters. STAR will be implemented by a collaboration led by Stanford University and including NASA and the space agencies of Saudi Arabia and Germany.</p> <p style="margin-bottom: 0in" align="JUSTIFY">The Laser Interferometer Space Antenna, LISA is a gravitational wave observatory covering the frequency range of 10<sup>-4</sup> Hz to 10<sup>-1</sup> Hz. It is being developed since about 1985 and expected to launch in 2025. We describe some of the technological challenges faced by the project and its present status.</p><p style="margin-bottom: 0in" align="JUSTIFY"> </p><p style="margin-bottom: 0in" align="JUSTIFY">Time and place:</p><p style="margin-bottom: 0in" align="JUSTIFY">8 October, 16:00</p><p style="margin-bottom: 0in" align="JUSTIFY">Meeting room, 4th floor, Physics Department, IST Alameda</p> <p style="margin-bottom: 0in" align="JUSTIFY"> </p>

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