Underground Sagnac gyroscope with sub-prad/s rotation rate sensitivity: Toward general relativity tests on Earth

Virgilio, A. Di; Basti, A.; Beverini, N.; Bosi, F.; Carelli, Giorgio; Ciampini, Donatella; Fuso, Francesco; Giacomelli, Umberto; Maccioni, Enrico; Marsili, Paolo; Ortolan, A.; Porzio, Alberto; Simonelli, Andrea; Terreni, G.

doi:10.1103/physrevresearch.2.032069

Cited by 33 publications

(11 citation statements)

References 27 publications

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“…Figure 9 shows the modified Allan deviation of the above data; with an integration time of 3 h, the MAD is 7 • 10 −8 , a figure a factor 70 far from the first target of GINGER. At present, we do not know the origin of the extra noise present in the region of several days, but we have checked that this level noise is a factor 2 − −3 larger than the polar motion signal (Di Virgilio et al, 2020a). It is important to remember that the geometry is not controlled, and the thermal expansion certainly plays a role.…”

Section: Analysis Resultsmentioning

confidence: 87%

Sagnac Gyroscopes and the GINGER Project

Virgilio

2020

Front. Astron. Space Sci.

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Large-frame optical Sagnac gyroscopes, more commonly called ring laser gyroscopes, are considered the only device able to provide fast and very high sensitivity measurement of the length of the day (LOD) and of the Earth rotation axis variations. Several large-frame Sagnac gyros are presently operative with a high duty cycle and a sensitivity well below fractions of nrad/s in 1 s measurement. At present, other inertial angular rotation sensors are not competitive with ring laser gyroscopes. The feasibility depends on the so-called hetero-lithic ring lasers. The present state of the art is reported and the feasibility of the main goals for geodesy discussed.

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Section: Analysis Resultsmentioning

confidence: 87%

Sagnac Gyroscopes and the GINGER Project

Virgilio

2020

Front. Astron. Space Sci.

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“…Specifically, GINGER is an Earth-based experiment suitable for measuring the Lense-Thirring and Geodesic precessions of the rotating Earth. The measurements of the rotation rate, by means of an array of ring lasers, provide the GR components of the gravito-magnetic field with a precision of at least 1% [73][74][75][76][77][78]. Recent results of its prototype GINGERino, at Gran Sasso Laboratories [78], indicate that GINGER should be able to measure Geodesic and Lense-Thirring effects with an uncertainty of 1 part in 10 4 and 10 3 , respectively 1 , of their value calculated in the framework of GR.…”

Section: Introductionmentioning

confidence: 99%

Constraining theories of gravity by GINGER experiment

et al. 2021

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The debate on gravity theories to extend or modify general relativity is very active today because of the issues related to ultraviolet and infrared behavior of Einstein’s theory. In the first case, we have to address the quantum gravity problem. In the latter, dark matter and dark energy, governing the large-scale structure and the cosmological evolution, seem to escape from any final fundamental theory and detection. The state of the art is that, up to now, no final theory, capable of explaining gravitational interaction at any scale, has been formulated. In this perspective, many research efforts are devoted to test theories of gravity by space-based experiments. Here, we propose straightforward tests by the GINGER experiment, which, being Earth based, requires little modeling of external perturbation, allowing a thorough analysis of the systematics, crucial for experiments where sensitivity breakthrough is required. Specifically, we want to show that it is possible to constrain parameters of gravity theories, like scalar–tensor or Horava–Lifshitz gravity, by considering their post-Newtonian limits matched with experimental data. In particular, we use the Lense–Thirring measurements provided by GINGER to find out relations among the parameters of theories and finally compare the results with those provided by LARES and Gravity Probe B satellites.

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“…The RLG interference signal was elaborated following the technique described in detail in Refs. [19][20][21][22]. There, we take into account the laser dynamic and reconstruct the true Sagnac frequency f s (in the following often expressed as the angular Sagnac frequency ω s = 2π f s ).…”

Section: Discussionmentioning

confidence: 99%

Effects of temperature variations in high-sensitivity Sagnac gyroscope

et al. 2021

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GINGERINO is one of the most sensitive Sagnac laser-gyroscopes based on an heterolithic mechanical structure. It is a prototype for GINGER, the laser gyroscopes array proposed to reconstruct the Earth rotation vector and in this way to measure General Relativity effects. Many factors affect the final sensitivity of laser gyroscopes, in particular, when they are used in long-term measurements, slow varying environmental parameters come into play. To understand the role of different terms allows to design more effective mechanical as well as optical layouts, while a proper model of the dynamics affecting long-term (low frequency) signals would increase the effectiveness of the data analysis for improving the overall sensitivity. In this contribution, we focus our concerns on the effects of room temperature and pressure aiming at further improving mechanical design and long-term stability of the apparatus. Our data are compatible with a local orientation changes of the Gran Sasso site below $$\mu $$ μ rad as predicted by geodetic models. This value is consistent with the requirements for GINGER and the installation of an high-sensitivity Sagnac gyroscope oriented at the maximum signal, i.e. along the Earth rotation axes.

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Underground Sagnac gyroscope with sub-prad/s rotation rate sensitivity: Toward general relativity tests on Earth

Cited by 33 publications

References 27 publications

Sagnac Gyroscopes and the GINGER Project

Sagnac Gyroscopes and the GINGER Project

Constraining theories of gravity by GINGER experiment

Effects of temperature variations in high-sensitivity Sagnac gyroscope

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