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MAGE Mid-term review (23/09/04): network report

MAGE Mid-term review (23/09/04): network report. * Financial support provided through the European Community's Improving Human Potential Program under contract RTN2-2002-00217, MAGE. S. Pireaux. MAGE factual information:. Name: Sophie PIREAUX Nationality: Belgian.

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MAGE Mid-term review (23/09/04): network report

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  1. MAGE Mid-term review (23/09/04):network report * Financial support provided through the European Community's Improving Human Potential Program under contract RTN2-2002-00217, MAGE S. Pireaux

  2. MAGE factual information: Name: Sophie PIREAUX Nationality: Belgian Age at appointment: 28 Start of appointment: 1st January 2003 End of appointment: 31st December 2004 Category: post-doc Specialty:-relativistic gravitation - IAU recommendations (relativistic ref. systems, space-time transfo, metric) - PPN formalism for testing alternative theories of gravitation - satellites and laser ranging tests of relativity Place of work:UMR5562 Dynamique Terrestre et Planétaire (DTP) Groupe de Recherche en Géodésie Spatiale (GRGS)Observatoire Midi-Pyrénées, Toulouse Country of work:France Previous experience in network: none

  3. Sketches of the young researcher: • A/ Scientific background: • Sept 02-Sept 98: PhD, research assistant, doctoral school, FYMA, UCL (Belgium) • Thesis:“Light deflection experiments as a test of relativistic theories of gravitation.” • Advisor: JM. Gérard • Contract: UCL researcher on exterior funds (IISN, convention n°4.4509.86.051) • 15 Nov 02 – 31 Dec 02: Assistant INSU/CNRS, DTP, OMP (France) • Jan 03 – Dec 04: present MAGE post-doc • B/ Future: • Jan 2005- Dec 2006 (or 2007?):CNES Post-doc, UMR GEMINI, OCA (France) • Subject: ``Solar astrodynamics and relativistic spin-orbit coupling'', • Collaboration: JP. Rozelot, E. Bois • …: apply to CNRS/CNAP, UMR ARTEMIS, OCA • Subject:``Tensor Scalar signatures in gravitational wave emission and detection with LISA?'' • Collaboration: with B. Chauvineau.

  4. Mobility: • contacts with geodesy community: their needs relativistic gravitation? a synergy gravitational theoreticians geodesists is crucial! • contacts with previous institute: regular home missions • Interesting research project: good prospects • native relativistic approach ultimately needed C/ Comments on present post-doctoral position: Advantages: • Drawbacks: • Ambitious project: single person, 2-year post-doc • Presently no joined effort …but GRGS expressed interest at GRGS Summer School 2004 ???

  5. (Semi-Classical) Relativistic Motion Integrator Collaborators: Observatoire Midi-Pyrénées • JP. Barriot • P. Rosenblatt Royal Observatory of Belgium MAGE research subject: « Integrating the motion of satellites in a consistent relativistic framework »

  6. Achievements: basis of RMI software First post-doctoral year: • Study of IAU2000 conventions for astronomy / space-astrometry • Comparison of different relativistic time transfo TT-DTB: SOFA libraries (IAU 2003), DE405 Time-Ephemeris (Irwin and Fukushima, 1999) • Implement transfo between different time scales: TAI , TT, t, TDB, TCB, TCG • Basis of native relativistic software: implementation for simple metrics (Schwarzschild, Kerr, mono / multi-pole) • Started implementation of GCRS metric recommended by the IAU2000 resolutions • Started implementation of new NRO model for Earth rotation (IAU2000) 2nd post-doctoral year • How non-gravitational forces fit in the relativistic framework • How relativistic equations with non-gravitational forces reduce to the classical ones • Order of magnitude of relativistic corrections

  7. Contact Sophie.Pireaux@cnes.fr Projects for the near future: develop RMI software What still needs to be done: • Continue implementation of IAU 2000 GCRS metric • Continue implementation of coordinate transfo • Verify internal / external coherence of ephemeris, astronomical constants used • Make actual comparisons with pre-existing classical orbitography softwares • Symplectic numerical integrator to conserve norm of quadrivector propre velocity • Transpose results to the case of a probe orbiting Mars

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