2015
DOI: 10.1088/0264-9381/32/22/224003
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Spacetime, spin and Gravity Probe B

Abstract: Abstract. It is more important than ever to push experimental tests of gravitational theory to the limits of existing technology in both range and sensitivity. This brief review focuses on spin-based tests of General Relativity and their implications for alternative, mostly non-metric theories of gravity motivated by the challenge of unification with the Standard Model of particle physics. The successful detection of geodetic precession and frame-dragging by Gravity Probe B places new constraints on a number o… Show more

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Cited by 12 publications
(11 citation statements)
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References 94 publications
(111 reference statements)
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“…Gravity Probe B is a gyroscope experiment in orbit around the Earth, that monitors the spin dynamics of four cryogenic gyroscopes onboard, relative to a remote guiding star. The analysis revealed a geodetic-precessing drift and a frame-dragging drift at precision of 0.3% and 19%, respectively, in agreement with GR [125,126].…”
supporting
confidence: 54%
“…Gravity Probe B is a gyroscope experiment in orbit around the Earth, that monitors the spin dynamics of four cryogenic gyroscopes onboard, relative to a remote guiding star. The analysis revealed a geodetic-precessing drift and a frame-dragging drift at precision of 0.3% and 19%, respectively, in agreement with GR [125,126].…”
supporting
confidence: 54%
“…These quantities have proved useful in, for example, classifying metrics [3,4] and deciding whether or not they are equivalent [5,6]. They have been applied to speed up the estimation of gravitational-wave signatures from black-hole collisions [7], to distinguish between "gravito-electrically" versus "gravito-magnetically dominated" regions of spacetime [8][9][10], to measure the mass and spin and locate the horizons of black holes [11][12][13][14], and to study perturbations of the Kerr metric [15], Lorentzian wormholes [16], and others [17].…”
Section: Introductionmentioning
confidence: 99%
“…In the proposed experiment, the parameter g is the gyrogravitational ratio: the ratio between intrinsic spin and angular momentum coefficients in the theoretical description of relativistic precession. If gravity affects intrinsic spin identically to orbital angular momentum, then g = 1, as expected based on Einstein's equivalence principle applied to intrinsic spin [19,[36][37][38][39]. In other approaches g differs from unity: for example, g = 2 in Refs.…”
mentioning
confidence: 77%
“…In principle, the projected measurement sensitivity of such a "Gravity Probe Spin" experiment is sufficient to measure the de Sitter and Lense-Thirring effects for g = 1. Consequently, stringent bounds will result on parametrized post-Newtonian (PPN) physics, scalar-tensor theories, and other standard-model extensions [36]. By comparing the sensitivity of Gravity Probe Spin to existing experimental bounds on anomalous gravity-induced spinprecession [76][77][78] as shown in Fig.…”
mentioning
confidence: 99%