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Galaxies 2015, 3(2), 84-102; doi:10.3390/galaxies3020084

Sagnac Effect, Ring Lasers and Terrestrial Tests of Gravity

1
DISAT, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino, Italy
2
INFN, Sezione di Torino, Via Pietro Giuria 1, Torino, Italy
Member of the GINGER collaboration.
Academic Editor: Lorenzo Iorio
Received: 2 March 2015 / Revised: 29 April 2015 / Accepted: 6 May 2015 / Published: 21 May 2015
(This article belongs to the Special Issue Advances in Gravitational Research)
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Abstract

Light can be used as a probe to explore the structure of space-time: this is usual in astrophysical and cosmological tests; however, it has been recently suggested that this can be done also in terrestrial laboratories. Namely, the Gyroscopes In General Relativity (GINGER) project aims at measuring post-Newtonian effects, such as the gravito-magnetic ones, in an Earth-based laboratory, by means of a ring laser array. Here, we first review the theoretical foundations of the Sagnac effect, on which ring lasers are based, and then, we study the Sagnac effect in a terrestrial laboratory, emphasizing the origin of the gravitational contributions that GINGER aims at measuring. Moreover, we show that accurate measurements allow one to set constraints on theories of gravity different from general relativity. Eventually, we describe the experimental setup of GINGER. View Full-Text
Keywords: Sagnac effect; ring laser; tests of gravity theories; gravito-magnetism Sagnac effect; ring laser; tests of gravity theories; gravito-magnetism
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Ruggiero, M.L. Sagnac Effect, Ring Lasers and Terrestrial Tests of Gravity. Galaxies 2015, 3, 84-102.

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