Methodology and instrumentation for testing the weak equivalence principle in stratospheric free fallстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Авторы:
Iafolla V. ,
Nozzoli S. ,
Lorenzini E. ,
Milyukov V.
Журнал:
Review of Scientific Instruments
Том:
69
Номер:
12
Год издания:
1998
Издательство:
AIP Publishing
Местоположение издательства:
United States
Первая страница:
4146
Последняя страница:
4151
Аннотация:
The use of the GiZero free-fall facility for testing the weak equivalence principle is discussed in this article. GiZero consists of a vacuum capsule, released from a balloon at an altitude of 40 km, which shields an experimental apparatus free falling inside the capsule itself. The expected residual acceleration external to the detector is 10-12 g (with g the Earth’s gravitational acceleration) for the 30 s free fall. A common-mode rejection factor of about 10-4 reduces the residual noise differential output to only 10-16 g. The gravity detector is a differential accelerometer with two test masses with coincident center of masses (i.e., zero baseline) with capacitive pick ups. Preparatory experiments have been conducted in the laboratory with a precursor detector by measuring controlled gravity signals, at low frequency, and by observing the Luni-Solar tides. The estimated accuracy in testing the weak equivalence principle, with a 95% confidence level, is 5 × 10-15 in a 30 s free fall. When compared to orbital free-fall experiments, the GiZero experiment can be considered as a valid compromise which is able to satisfy the requirement for improving significantly the experimental accuracy in testing the equivalence principle with a substantial lower cost, the ability to recover the detector and to repeat the experiment at relatively short time intervals. © 1998 American Institute of Physics.
Добавил в систему:
Милюков Вадим Константинович