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Einstein Gravity Explorer - A Medium-Experimental Astronomy Class Fundametal Physics Mission

Schiller, S. and Tino, G. and Gill , P. and Salomon, C. and Sterr, U. and Peik, E. and Nevsky, A. and Görlitz, A. and Svehla, D. and Ferrari, G. and Poli, N. and Lusanna, L. and Klein, H. and Margolis, H. and Lemonde, P. and Laurent, P. and Santarelli, G. and Clairon, A. and Ertmer, W. and Rasel, E. and Müller, J. and Iorio, L. and Lämmerzahl, C. and Dittus, H. and Gill, E. and Rothacher, M. and Flechtner, F. and Schreiber, U. and Flambaum, V. and Ni, W.-T. and Liu, L. and Chen, X.-Z. and Chen, J.-B. and Gao, K. and Cacciapuoti, L. and Holzwarth, R. and Heß, P. and Schäfer, W. (2009) Einstein Gravity Explorer - A Medium-Experimental Astronomy Class Fundametal Physics Mission. Experimental Astronomy, 23, pp. 573-610. Springer. DOI: 10.1007/s10686-008-9126-5. ISSN 0922-6435.

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The Einstein Gravity Explorer mission (EGE) is devoted to a precise measurement of the properties of space-time using atomic clocks. It tests one of the most fundamental predictions of Einstein´s Theory of General Relativity, the gravitational redshift, and therby searches for hints of quantum effects in gravity, exploring one of the most important and challenging frontiers in fundamental physics. The promary mission goal is the measurement of the gravitational redshift with an accuracy up to a factor 10^4 higher than the best current results. The mission is based on a satellite carrying cold atom-based clocks. The payload includes a cesium microwave clock (PHARAO), an optical clock, a femtosecond frequency comb, as well as precise microwave time transfer systems between space and ground. The tick rates of the clock are continuously compared with each other, and nearly continuously with clocks on earth, during the course of the 3-year mission. The highly elliptic orbit of the satellite is optimized for the scientific goals, providing a large variation in the gravitational potential between perigee and apogee. Besides the fundamental physics results, as secondary goals EGE will establish a global reference frame for the Earth´s gravitational potential and will allow a new approach to mapping Earth´s gravity field with very high spatial resolution. The mission was proposed as a class-M mission to ESA´s Cosmic Vision Program 2015-2025.

Document Type:Article
Title:Einstein Gravity Explorer - A Medium-Experimental Astronomy Class Fundametal Physics Mission
AuthorsInstitution or Email of Authors
Schiller, S.step.schiller@uni-duesseldorf.de, Inst. f. Experimentalphysik, Heirich-Heine Univ. Düsseldorf
Tino, G.Dipt. di Fisica, LENS Lab., Univ. Firenze
Gill , P.National Physics Lab. Teddington
Salomon, C.Lab. Kastler Brossel, CNRS, Paris
Sterr, U.PTB, Braunschweig
Peik, E.PTB, Braunschweig
Nevsky, A.Inst. f. Experimentalphysik, Heirich-Heine Univ. Düsseldorf
Görlitz, A.Inst. f. Experimentalphysik, Heirich-Heine Univ. Düsseldorf
Svehla, D.Inst. of Astronomical and Physical Geodesy, TU München
Ferrari, G.Dipt. di Fisica, LENS Lab., Univ. Firenze
Poli, N.Dipt. di Fisica, LENS Lab., Univ. Firenze
Lusanna, L.INFN, Sez. di Firenze
Klein, H.National Physics Lab. Teddington
Margolis, H.National Physics Lab. Teddington
Lemonde, P.LNE-SYRTE, Obs, de Paris
Laurent, P.LNE-SYRTE, Obs, de Paris
Santarelli, G.LNE-SYRTE, Obs, de Paris
Clairon, A.LNE-SYRTE, Obs, de Paris
Ertmer, W.Inst. f. Quantenoptik, Leibniz Univ. Hannover
Rasel, E.Inst. f. Quantenoptik, Leibniz Univ. Hannover
Müller, J.Inst. f. Erdmessung, Leibniz Univ. Hannover
Iorio, L.INFN, Sez. di Pisa, Bari
Lämmerzahl, C.ZARM, Univ. Bremen
Dittus, H.Inst. f. Raumfahrtsysteme, DLR, Bremen
Gill, E.Dept. Earth Observation and Space Systems, TU Delft
Rothacher, M.GeoForschungszentrum, Potsdam
Flechtner, F.GeoForschungszentrum, Potsdam
Schreiber, U.Fundamentalstation Wettzell, Bad Kötzting
Flambaum, V.Univ. New South Wales, Sydney
Ni, W.-T.Purple Mountain Obs., Nanjing
Liu, L.Shanghai Inst. of Optics and Fine Mechanics
Chen, X.-Z.Inst. of Quantum Electronics, School of Electronics Eng. and Computer Sci., Beijing
Chen, J.-B.Inst. of Quantum Electronics, School of Electronics Eng. and Computer Sci., Beijing
Gao, K.Wuhan Inst. of Physics and Mathematics, Chinese Acad. of Sci.
Cacciapuoti, L.ESA /ESTEC, Noordwijk
Holzwarth, R.Max-Planck-Institut für Quantenoptik, Garching
Heß, P.Astrium ST, Friedrichshafen
Schäfer, W.TimetECH GmbH, Stuttgart
Date:March 2009
Journal or Publication Title:Experimental Astronomy
Refereed publication:Yes
In ISI Web of Science:Yes
Page Range:pp. 573-610
von Ballmoos, PeterUNSPECIFIED
Keywords:Gravitational redshift, Gravitational frequency shift, Atomic clock, Optical clock, Equivalence principle, Local position invariance, Special Relativity, Lorentz Invariance, General Relativity, Geoid, Frequency transfer, Microwave link Gravitational potential
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignement
DLR - Research area:Space
DLR - Program:W - no assignement
DLR - Research theme (Project):W -- no assignement (old)
Location: Bremen
Institutes and Institutions:Institute of Space Systems
Deposited By: Prof.Dr. Hansjörg Dittus
Deposited On:24 Feb 2010 09:29
Last Modified:04 Apr 2013 16:20

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