Abstract
The accurate test of the Universality of Free Fall may demonstrate a violation of Einstein Equivalence Principle (EP) as most attempts of Grand Unification theories seem to conduct. The MICROSCOPE space mission aims at an accuracy of 10−15 with a small drag free satellite and a payload based on electrostatic inertial sensors. The two test-masses made of Platinum and Titanium alloys are forced to follow accurately the same orbit. The sets of surrounding electrodes carried by gold coated silica parts allows the generation of electrical fields and electrostatic pressures on the masses. Common forces and torques are exploited to control the satellite drag compensation system and its fine inertial or rotating pointing. Difference in the force along the Earth gravity monopole is accurately measured and interpreted for the test. After a short presentation of the mission and the instrument, most of the relevant parameters to the experiment performance are detailed as well as the associated technologies to reach the expected levels of accuracy. Present error budgets confirm the test expected accuracy of better than 10−15.
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References
Y. André et al., Impact de la propulsion gaz froid sur la mission MICROSCOPE. Cnes Report MIC-NT-S-0-962-CNS (2007)
S. Baessler et al., Improved test of the equivalence principle for gravitational self- energy. Phys. Rev. Lett. 83, 18 (1999)
C. Brans, R.H. Dickes, Mach’s principle and a relativistic theory of gravitation. Phys. Rev. 124, 925 (1961)
D.G. Currie et al., A lunar laser ranging RetroReflector array for the 21st century, in NLSI Lunar Science Conference (2008)
T. Damour, Testing the equivalence principle: Why and how? Class. Quantum Grav. 13, A33–A41 (1996)
T. Damour, J.P. Blaser, Optimizing the choice of materials in equivalence principle experiments, in Particle Astrophysics, Atomic Physics and Gravitation, ed. by J. Tran Than Van, G. Fontaine, E. Hinds (Frontières, Gif-sur-Yvette, 1994), pp. 433–440
T. Damour, F. Piazza, G. Veneziano, Violation of the equivalence principle in a dilaton-runaway scenario. Phys. Rev. D 66, 046007 (2002)
A. Einstein, The Meaning of Relativity (Princeton University Press, Princeton, 1922) (1988)
A. Einstein, Theory of radiometer energy source. Z. Phys. 27, 1–6 (1924)
D. Feldman, Z. Liu, P. Nath, Sparticles at the LHC. JHEP 04, 054 (2008)
J. Flury, S. Bettadpur, B.D. Tapley, Precise accelerometry onboard the GRACE gravity field satellite mission. Adv. Space Res. 42, 1414–1423 (2008)
F. Grassia et al., Quantum theory of fluctuations in a cold damped accelerometer. Eur. Phys. J. D 8, 101–110 (1999)
E. Guiu et al., Calibration of MICROSCOPE. Adv. Space Res. 39, 315–323 (2007)
G.D. Hammond et al., New constraints on short-range forces coupling mass to intrinsic spin. Phys. Rev. Lett. 98, 081101 (2007)
L. Iorio, LARES/WEBER-SAT and the equivalence principle. Europhys. Lett. 80, 40007 (2007)
V. Josselin, P. Touboul, R. Kielbasa, Capacitive detection scheme for space accelerometers applications. Sens. Actuators 78, 92–98 (1999)
L. Lafargue, M. Rodrigues, P. Touboul, Towards low temperature electrostatic accelerometry. Rev. Sci. Instrum. 73, 1 (2002)
J. Mester, R. Torii, P. Worden, N. Lockerbie, S. Vitale, C.W.F. Everitt, The STEP mission: principles and baseline design. Class. Quantum Grav. 18, 2475–2486 (2001). See also http://einstein.stanford.edu/
R. Newman, Prospects for terrestrial equivalence principle tests with a cryogenic torsion pendulum. Class. Quantum Grav. 18, 2407–2415 (2001)
A. Nobili et al., The GG project: Testing the Equivalence Principle in space and on Earth. Adv. Space Res. 25, 1231–1235 (2000)
S.E. Pollack, S. Schlamminger, J.H. Gundlach, Outgassing, temperature gradients and the radiometer effect in LISA: a torsion pendulum investigation. arXiv:gr-qc/0702051v2 (2007)
G. Schäfer, Where do we stand in testing general relativity? Adv. Space Res. 32(7), 1203–1208 (2003)
S. Schlamminger et al., Test of the equivalence principle using a rotating torsion balance. Phys. Rev. Lett. 100, 04110 (2008)
T.J. Sumner et al., STEP (satellite test of the equivalence principle). Adv. Space Res. 39, 254–258 (2007)
P. Touboul et al., MICROSCOPE, testing the equivalence principle in space. C. R. Acad. Sci. Paris, Sér. IV 2, 1271–1286 (2001)
P. Touboul et al., The MICROSCOPE mission. Acta Astronaut. 50(7), 433–443 (2002)
P. Touboul et al., In orbit nano-g measurements, lessons for future space missions. Aerospace Sci. Technol. 8, 431–44 (2004)
C.M. Will, Theory and Experiment in Gravitational Physics (Cambridge University Press, Cambridge, 1985)
E. Willemenot, P. Touboul, On-ground investigations of space accelerometers noise with an electrostatic torsion pendulum. Rev. Sci. Instrum. 71(1), 302–309 (1999a)
E. Willemenot, P. Touboul, Electrostatically suspended torsion pendulum. Rev. Sci. Instrum. 71(1), 310–314 (1999b)
J.G. Williams, X.X. Newhall, J.O. Dickey, Relativity parameters determined from lunar laser ranging. Phys. Rev. D 53, 6730 (1996)
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Touboul, P. The Microscope Mission and Its Uncertainty Analysis. Space Sci Rev 148, 455–474 (2009). https://doi.org/10.1007/s11214-009-9565-y
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DOI: https://doi.org/10.1007/s11214-009-9565-y