Abstract
The discovery of the accelerating expansion of the Universe, thought to be driven by a mysterious form of “dark energy” constituting most of the Universe, has further revived the interest in testing Einstein’s theory of General Relativity. At the very foundation of Einstein’s theory is the geodesic motion of a small, structureless test-particle. Depending on the physical context, a star, planet or satellite can behave very nearly like a test-particle, so geodesic motion is used to calculate the advance of the perihelion of a planet’s orbit, the dynamics of a binary pulsar system and of an Earth-orbiting satellite. Verifying geodesic motion is then a test of paramount importance to General Relativity and other theories of fundamental physics. On the basis of the first few months of observations of the recently launched satellite LARES, its orbit shows the best agreement of any satellite with the test-particle motion predicted by General Relativity. That is, after modelling its known non-gravitational perturbations, the LARES orbit shows the smallest deviations from geodesic motion of any artificial satellite: its residual mean acceleration away from geodesic motion is less than \(\ensuremath 0.5\times10^{-12}\) m/s^2. LARES-type satellites can thus be used for accurate measurements and for tests of gravitational and fundamental physics. Already with only a few months of observation, LARES provides smaller scatter in the determination of several low-degree geopotential coefficients (Earth gravitational deviations from sphericity) than available from observations of any other satellite or combination of satellites.
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References
C.W. Misner, K.S. Thorne, J.A. Wheeler, Gravitation (Freeman, San Francisco, 1973)
S.W. Hawking, G.F.R. Ellis, The Large Scale Structure of Space-Time (Cambridge University Press, 1975)
I. Ciufolini, J.A. Wheeler, Gravitation and Inertia (Princeton University Press, Princeton, New Jersey, 1995)
C.M. Will, Theory and Experiment in Gravitational Physics, 2nd edition (Cambridge University Press, Cambridge, UK, 1993)
S.G. Turyshev, Usp. Fiz. Nauk 179, 3 (2009) Phys. Uspekhi 52
A. Riess et al., Astron. J. 116, 1009 (1998)
S. Perlmutter et al., Astrophys. J. 517, 565 (1999)
S. Perlmutter, Phys. Today 56, 53 (2003)
R.R. Caldwell, Phys. World 17, 37 (2004)
G. Bertone, D. Hooper, J. Silk, Phys. Rep. 405, 279 (2005)
G. Dvali, G. Gabadadze, M. Porrati, Phys. Lett. B 485, 208 (2000)
S. Carroll et al., Phys. Rev. D 70, 083509 (2004)
R. Reinabelle Reyes et al., Nature Lett. 464, 256 (2010)
J.B. Hartle, Gravity: An Introduction to Einstein’s General Relativity (Addison Wesley, San Francisco, 2003)
W. Rindler, Relativity: Special, General, and Cosmological (Oxford University Press, Oxford, 2001)
J. Ehlers, Survey of General Relativity Theory, in Relativity, Astrophysics and Cosmology, edited by W. Israel (Reidel Publishing, 1973) pp. 1-125
J. Ehlers, R. Geroch, Ann. Phys. 309, 232 (2004)
R. Geroch, P.S. Jang, J. Math. Phys. 16, 65 (1975)
I. Ciufolini, A. Paolozzi, E.C. Pavlis, J.C. Ries, R. Koenig, R. Matzner, The LARES Space Experiment: LARES Orbit, Error Analysis and Satellite Structure, in General Relativity and John Archibald Wheeler, edited by I. Ciufolini, R. Matzner (Springer, 2010) pp. 467-492
M.R. Pearlman, J.J. Degnan, J.M. Bosworth, Adv. Space Res. 30, 135 (2002) DOI:10.1016/S0273-1177(02)00277-6
W.J. Bencze et al., Adv. Astron. Sci. 125, 425 (2006)
LAGEOS scientific results, J. Geophys. Res. B, Vol. 90 (1985) pp. 9215-9438
B.D. Tapley, The GRACE mission: status and performance assessment in Eos. Trans. AGU 83 Fall Meet. Suppl. Abstract G12B-01 (2002)
Ch. Reigber, F. Flechtner, R. Koenig, U. Meyer, K. Neumayer, GRACE orbit and gravity field recovery at GFZ Potsdam-first experiences and perspectives in Eos. Trans. AGU 83 Fall Meet. Suppl., Abstract G12B-03 (2002)
D.E. Pavlis, GEODYN operations manuals (Contractor Report, Raytheon, ITSS, Landover MD, 1998)
C.F. Martin, D.P. Rubincam, J. Geophys. Res. B 101, 3215 (1996)
D.P. Rubincam, Celest. Mech. Dyn. Astron. 26, 361 (1982)
D.P. Rubincam, J. Geophys. Res. B 93, 13805 (1988)
G. Métris, D. Vokroulicky, J.C. Ries, R.J. Eanes, J. Geophys. Res. 102, 2711 (1997)
I. Ciufolini, Nature 449, 41 (2007)
I. Ciufolini, E. Pavlis, Nature Lett. 431, 958 (2004)
I. Ciufolini, E.C. Pavlis, J.C. Ries, R. Koenig, G. Sindoni, A. Paolozzi, H. Neumayer, “Test of Gravitomagnetism with the LAGEOS and GRACE Satellites”, in General Relativity and John Archibald Wheeler, edited by I. Ciufolini, R. Matzner (Springer, 2010) pp. 371-434
T.L. Smith, A.L. Erickcek, R.R. Caldwell, M. Kamionkowski, Phys. Rev. D 77, 024015 (2008)
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Ciufolini, I., Paolozzi, A., Pavlis, E. et al. Testing General Relativity and gravitational physics using the LARES satellite. Eur. Phys. J. Plus 127, 133 (2012). https://doi.org/10.1140/epjp/i2012-12133-8
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DOI: https://doi.org/10.1140/epjp/i2012-12133-8