Details
| Original language | English |
|---|---|
| Article number | 34 |
| Journal | Universe |
| Volume | 7 |
| Issue number | 2 |
| Publication status | Published - 3 Feb 2021 |
Abstract
Since 1969, Lunar Laser Ranging (LLR) data have been collected by various observa-tories and analysed by different analysis groups. In the recent years, observations with bigger telescopes (APOLLO) and at infra-red wavelength (OCA) are carried out, resulting in a better distribution of precise LLR data over the lunar orbit and the observed retro-reflectors on the Moon. This is a great advantage for various investigations in the LLR analysis. The aim of this study is to evaluate the benefit of the new LLR data for the determination of relativistic parame-ters. Here, we show current results for relativistic parameters like a possible temporal variation of the gravitational constant Ġ/G0 = (−5.0 ± 9.6) × 10−15 yr−1, the equivalence principle with ∆( mg /mi)EM= (−2.1±2.4)×10−14, and the PPN parameters β − 1 = (6.2 ± 7.2) × 10−5 and γ − 1 = (1.7 ± 1.6) × 10−4. The results show a significant improvement in the accuracy of the various parameters, mainly due to better coverage of the lunar orbit, better distribution of measurements over the lunar retro-reflectors, and last but not least, higher accuracy of the data. Within the estimated accuracies, no violation of Einstein’s theory is found and the results set improved limits for the different effects.
Keywords
- Equivalence principle, Gravitational constant, Lunar laser ranging, PPN parameters
ASJC Scopus subject areas
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In: Universe, Vol. 7, No. 2, 34, 03.02.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Benefit of new high-precision llr data for the determination of relativistic parameters
AU - Biskupek, Liliane
AU - Müller, Jürgen
AU - Torre, Jean Marie
N1 - Funding Information: Funding: This research was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy–EXC-2123 QuantumFrontiers–390837967 and by the Deutsches Zentrum für Luft-und Raumfahrt (DLR, German Aerospace Center), Institute for Satellite Geodesy and Inertial Sensing.
PY - 2021/2/3
Y1 - 2021/2/3
N2 - Since 1969, Lunar Laser Ranging (LLR) data have been collected by various observa-tories and analysed by different analysis groups. In the recent years, observations with bigger telescopes (APOLLO) and at infra-red wavelength (OCA) are carried out, resulting in a better distribution of precise LLR data over the lunar orbit and the observed retro-reflectors on the Moon. This is a great advantage for various investigations in the LLR analysis. The aim of this study is to evaluate the benefit of the new LLR data for the determination of relativistic parame-ters. Here, we show current results for relativistic parameters like a possible temporal variation of the gravitational constant Ġ/G0 = (−5.0 ± 9.6) × 10−15 yr−1, the equivalence principle with ∆( mg /mi)EM= (−2.1±2.4)×10−14, and the PPN parameters β − 1 = (6.2 ± 7.2) × 10−5 and γ − 1 = (1.7 ± 1.6) × 10−4. The results show a significant improvement in the accuracy of the various parameters, mainly due to better coverage of the lunar orbit, better distribution of measurements over the lunar retro-reflectors, and last but not least, higher accuracy of the data. Within the estimated accuracies, no violation of Einstein’s theory is found and the results set improved limits for the different effects.
AB - Since 1969, Lunar Laser Ranging (LLR) data have been collected by various observa-tories and analysed by different analysis groups. In the recent years, observations with bigger telescopes (APOLLO) and at infra-red wavelength (OCA) are carried out, resulting in a better distribution of precise LLR data over the lunar orbit and the observed retro-reflectors on the Moon. This is a great advantage for various investigations in the LLR analysis. The aim of this study is to evaluate the benefit of the new LLR data for the determination of relativistic parame-ters. Here, we show current results for relativistic parameters like a possible temporal variation of the gravitational constant Ġ/G0 = (−5.0 ± 9.6) × 10−15 yr−1, the equivalence principle with ∆( mg /mi)EM= (−2.1±2.4)×10−14, and the PPN parameters β − 1 = (6.2 ± 7.2) × 10−5 and γ − 1 = (1.7 ± 1.6) × 10−4. The results show a significant improvement in the accuracy of the various parameters, mainly due to better coverage of the lunar orbit, better distribution of measurements over the lunar retro-reflectors, and last but not least, higher accuracy of the data. Within the estimated accuracies, no violation of Einstein’s theory is found and the results set improved limits for the different effects.
KW - Equivalence principle
KW - Gravitational constant
KW - Lunar laser ranging
KW - PPN parameters
UR - http://www.scopus.com/inward/record.url?scp=85106860698&partnerID=8YFLogxK
U2 - 10.3390/universe7020034
DO - 10.3390/universe7020034
M3 - Article
AN - SCOPUS:85106860698
VL - 7
JO - Universe
JF - Universe
IS - 2
M1 - 34
ER -