Rolf Koenig
University of Texas at Austin
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European Physical Journal Plus | 2012
Ignazio Ciufolini; Antonio Paolozzi; Erricos C. Pavlis; John C. Ries; V. G. Gurzadyan; Rolf Koenig; Richard A. Matzner; Roger Penrose; Giampiero Sindoni
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
Archive | 2010
Ignazio Ciufolini; Erricos C. Pavlis; John C. Ries; Rolf Koenig; Giampiero Sindoni; Antonio Paolozzi; Hans Newmayer
\ensuremath 0.5\times10^{-12}
European Physical Journal C | 2016
Ignazio Ciufolini; Antonio Paolozzi; Erricos C. Pavlis; Rolf Koenig; John C. Ries; V. G. Gurzadyan; Richard A. Matzner; Roger Penrose; Giampiero Sindoni; Claudio Paris; H. G. Khachatryan; Sergey Mirzoyan
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.
Archive | 2010
Ignazio Ciufolini; Antonio Paolozzi; Erricos C. Pavlis; John C. Ries; Rolf Koenig; Richard A. Matzner; Giampiero Sindoni
Dragging of Inertial Frames and gravitomagnetism are predictions of Einstein’s theory of General Relativity. Here, after a brief introduction to these phenomena of Einstein’s gravitational theory, we describe the method we have used to measure the Earth’s gravitomagnetic field using the satellites LAGEOS (LAser GEOdynamics Satellite), LAGEOS 2 and the Earth’s gravity models obtained by the spacecraft GRACE. We then report the results of our analysis with LAGEOS and LAGEOS 2, and with a number of GRACE (Gravity Recovery and Climate Experiment) models, that have confirmed this prediction of Einstein General Relativity and measured the Earth’s gravitomagnetic field with an accuracy of approximately 10%. We finally discuss the error sources in our measurement of gravitomagnetism and, in particular, the error induced by the uncertainties in the GRACE Earth gravity models. Here we both analyze the errors due to the static and time-varying Earth gravity field, and in particular we discuss the accuracy of the GRACE-only gravity models used in our measurement. We also provide a detailed analysis of the errors due to atmospheric refraction mis-modelling and to the uncertainties in measuring the orbital inclination. In the appendix, we report the complete error analysis and the total error budget in the measurement of gravitomagnetism with the LAGEOS satellites.
arXiv: General Relativity and Quantum Cosmology | 2013
Ignazio Ciufolini; Antonio Paolozzi; Rolf Koenig; Erricos C. Pavlis; John C. Ries; Richard A. Matzner; V. G. Gurzadyan; Roger Penrose; Giampiero Sindoni; Claudio Paris
We present a test of general relativity, the measurement of the Earth’s dragging of inertial frames. Our result is obtained using about 3.5 years of laser-ranged observations of the LARES, LAGEOS, and LAGEOS 2 laser-ranged satellites together with the Earth gravity field model GGM05S produced by the space geodesy mission GRACE. We measure
Classical and Quantum Gravity | 2013
Ignazio Ciufolini; B Moreno Monge; Antonio Paolozzi; Rolf Koenig; Giampiero Sindoni; Grzegorz Michalak; Erricos C. Pavlis
European Physical Journal Plus | 2017
Ignazio Ciufolini; Antonio Paolozzi; Erricos C. Pavlis; Giampiero Sindoni; Rolf Koenig; John C. Ries; Richard A. Matzner; V. G. Gurzadyan; Roger Penrose; David Parry Rubincam; Claudio Paris
\mu = (0.994 \pm 0.002) \pm 0.05
European Physical Journal Plus | 2017
Ignazio Ciufolini; Erricos C. Pavlis; Giampiero Sindoni; John C. Ries; Antonio Paolozzi; Richard A. Matzner; Rolf Koenig; Claudio Paris
ieee international workshop on metrology for aerospace | 2016
Richard A. Matzner; Phuc H. Nguyen; Jason W. Brooks; Ignazio Ciufolini; Antonio Paolozzi; Erricos C. Pavlis; Rolf Koenig; John C. Ries; V. G. Gurzadyan; Roger Penrose; Giampiero Sindoni; Claudio Paris; H. G. Khachatryan; Sergey Mirzoyan
μ=(0.994±0.002)±0.05, where
Space Science Reviews | 2009
Ignazio Ciufolini; Antonio Paolozzi; Erricos C. Pavlis; John C. Ries; Rolf Koenig; Richard A. Matzner; Giampiero Sindoni; Hans Neumayer