Título:
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Novel methods to measure the gravitational constant in space
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Autor/a:
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Armano, M.; Audley, H.; Baird, J.; Binetruy, P.; Born, M.; Bortoluzzi, D.; Ramos Castro, Juan José
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Otros autores:
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica |
Abstract:
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We present two novel methods, tested by LISA Pathfinder, to measure the gravitational constant G for the first time in space. Experiment 1 uses electrostatic suspension forces to measure a change in acceleration of a test mass due to a displaced source mass. Experiment 2 measures a change in relative acceleration between two test masses due to a slowly varying fuel tank mass. Experiment 1 gave a value of G=6.71±0.42(×10-11)¿¿m3¿s-2¿kg-1 and experiment 2 gave 6.15±0.35(×10-11)¿¿m3¿s-2¿kg-1, both consistent with each other to 1s and with the CODATA 2014 recommended value of 6.67408±0.00031(×10-11)¿¿m3¿s-2¿kg-1 to 2s. We outline several ideas to improve the results for a future experiment, and we suggest that a measurement in space would isolate many terrestrial issues that could be responsible for the inconsistencies between recent measurements. |
Abstract:
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Peer Reviewed |
Materia(s):
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-Àrees temàtiques de la UPC::Física::Astronomia i astrofísica -Astrophysics -General physics -Gravitation -Cosmology and astrophysics -Laboratory studies of gravity -Astrofísica |
Derechos:
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Tipo de documento:
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Artículo - Versión publicada Artículo |
Editor:
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American Physical Society (APS)
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