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Speaker |
Rosi, Gabriele |
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Coauthors |
Cacciapuoti, Luigi; Prevedelli, Marco; Sorrentino; Fiodor; Tino, Guglielmo Maria Lucio |
| Talk Title |
Precision measurement of the Newtonian gravitational constant by atom interferometry |
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Abstract |
The accurate determination of the Gravitational Constant G has always been a formidable task. After 300 different measurements, starting from the original one performed by Cavendish in 1798, the G value still now presents a large relative uncertainty compared to all other physical constants. In order to detect systematic effects that plague such measurements the use of different methods with respect to the traditional ones is crucial. Here we report on the first precise determination of G using microscopic test masses in free fall (cold Rubidium atoms) and quantum interferometry to probe gravity. We obtain the value G = 6.67191(99)x10^-11 m^3 kg^-1 s^-2 with a relative uncertainty of 150 ppm. Our value is at 1.5 combined standard deviations from the current recommended value of the Committee on Data for Science and Technology (CODATA). |
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