# Measuring Gravito-magnetic Effects by Multi Ring-Laser Gyroscope

Bosi, F. and Cella, G. and Virgilio, A. Di and Ortolan, A. and Porzio, A. and Solimeno, S. and Cerdonio, M. and Zendri, J. P. and Allegrini, M. and Belfi, J. and Beverini, N. and Bouhadef, B. and Carelli, l G. and Ferrante, I. and Maccioni, E. and Passaquieti, R. and Stefani, F. and Ruggiero, M. L. and Tartaglia, A. and Schreiber, K. U. and Gebauer, A. and Wells, J-P. R. (2011) Measuring Gravito-magnetic Effects by Multi Ring-Laser Gyroscope. Physical review. D, Particles, fields, gravitation, and cosmology, 84 (12). p. 122002. ISSN 1550-7998

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## Abstract

SUMMARY We propose an under-ground experiment to detect the general relativistic effects due to the curvature of space-time around the Earth (de Sitter effect) and to rotation of the planet (dragging of the inertial frames or Lense-Thirring effect). It is based on the comparison between the IERS value of the Earth rotation vector and corresponding measurements obtained by a tri-axial laser detector of rotation. The proposed detector consists of six large ring-lasers arranged along three orthogonal axes. In about two years of data taking, the 1% sensitivity required for the measurement of the Lense-Thirring drag can be reached with square rings of 6 $m$ side, assuming a shot noise limited sensitivity ($20 prad/s/\sqrt{Hz}$). The multi-gyros system, composed of rings whose planes are perpendicular to one or the other of three orthogonal axes, can be built in several ways. Here, we consider cubic and octahedron structures. The symmetries of the proposed configurations provide mathematical relations that can be used to study the stability of the scale factors, the relative orientations or the ring-laser planes, very important to get rid of systematics in long-term measurements, which are required in order to determine the relativistic effects.

Item Type: Article Imported from arXiv Area02 - Scienze fisiche > FIS/03 - Fisica della materia Dipartimenti (from 2013) > DIPARTIMENTO DI FISICA dott.ssa Sandra Faita 07 Aug 2013 13:10 08 Aug 2013 12:00 http://eprints.adm.unipi.it/id/eprint/1471

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