Gravity Probe B: Final Results of a Space Experiment to Test General Relativity

Everitt, C. W. F.; DeBra, D.; Parkinson, Bradford W.; Turneaure, J. P.; Conklin, John; Heifetz, M.; Keiser, G. M.; Silbergleit, A. S.; Holmes, Tim; Kolodziejczak, J.; Al-Meshari, M; Mester, John; Muhlfelder, B.; Solomonik, V.; Ståhl, Kristina; Worden, P.; Bencze, W.; Buchman, Sasha; Clarke, Bruce; Aljadaan, Ahmad; Aljibreen, Hamoud; Li, J.; Lipa, J. A.; Lockhart, J. M.; Alsuwaidan, Badr N.; Taber, M.; Wang, S.

doi:10.1103/physrevlett.106.221101

Cited by 847 publications

(632 citation statements)

References 10 publications

Supporting

Mentioning

596

Contrasting

Unclassified

Order By: Relevance

“…Основные постулаты ОТО и некоторые ре-шения ее уравнений недавно еще раз выдержали экспериментальную проверку. Во-первых, косми-ческой миссией Gravity Probe B обнаружен эффект искривления пространства-времени, количествен-но совпадающий с предсказаниями ОТО [Everitt et al, 2011], и, во-вторых, решения линеаризованной системы уравнений ОТО подтверждены обнаруже-нием гравитационных волн в лабораторных усло-виях [Abbott et al, 2016]. С момента зарождения ОТО стали находиться точные решения уравнений, к которым относятся, например, статическое сферически-симметричное решение Шварцшильда (1916), описывающее черную дыру [Kruskal, 1960], и решение для вращающейся черной дыры [Kerr, 1963].…”

Section: примеры континуального подхода к описанию дискретной и дискрunclassified

On Discrete Structure of Geologic Medium and Continual Approach to Modeling Its Movements

Мухамедиев

2016

Geodin. tektonofiz.

View full text Add to dashboard Cite

This paper discusses the structure of a geologic medium represented by accessible lithified rocks and provides an overview of methods used to describe its movements. Two basic opinions are considered in the framework of the discussion: (1) an initially homogeneous and continuous geologic medium acquires the structure composed of blocks in the process of the geologic medium's deformation/destruction/degradation, and (2) a geologic medium is composed of blocks (and often has hierarchic, active, energy-saturated features), and the continuity model is thus not valid for describing the geologic medium's deformation. Proponents of the first point of view actively apply the standard or modified continuum model of a solid deformed body (SDB) in estimations of the stress-strain state, but the input parameters of this model do not contain any information on discreteness in principle. Authors who support the second opinion, either explicitly or implicitly assume that the block structure of the geologic medium, which is detectable by geological methods, makes a direct and unambiguous impact on all other mechanical properties of the geologic medium and, above all, on the nature of its movements.Based on results obtained by interpreting the data collected in our long-term field studies of rock fracturing, mathematical processing of GPS-measurements, and theoretical models, we agree with the concept of the geologic medium's block structure, but argue that the geologic block-structure property is not acquired but congenital. Regarding sedimentary rocks, it means that the discrete structure has been already embodied in the rock before sediment lithification, regardless of the intensity of macroscopic deformations. A discrete structure is the form of the geologic medium existence and a cause of the congenital anisotropy of the geologic medium's strength characteristics. Due to subsequent deformation of the geologic medium, some elements of the structure can be manifested more clearly, and the structure itself can become more complex due to secondary effects. At the same time, the structure of geologic blocks is not directly manifested in the spatial and temporal features of the recent movements in the geologic medium. However, it is not an obstacle to developing continuum models of such movements in the same way as, for instance, the adequacy of the continuum general theory of relativity is not denied in view of the discrete-hierarchical structure of the Universe.The key requirements to a model include its applicability, testability, confirmability/deniability of its predictions in the investigated space-time scale, and compliance with conservation laws. This paper briefly discusses the most important aspects of the continuum approach based on the concept of an effective continuous medium and, above all, the Cauchy continuum model, envisaging that the dynamic response of the medium in spatial descriptions is given only by the Cauchy symmetric stress tensor (T). In more general continuum models of the medium (such as mom...

show abstract

Section: примеры континуального подхода к описанию дискретной и дискрunclassified

On Discrete Structure of Geologic Medium and Continual Approach to Modeling Its Movements

Мухамедиев

2016

Geodin. tektonofiz.

View full text Add to dashboard Cite

show abstract

“…Its concept was very simple: put a star-tracking telescope and a high precision gyroscope on orbit, keep the telescope pointing at the guide star (GS) as an inertial reference, and measure the rate of change of the angle between the line of sight to the GS and the gyro spin (see figure 1 in [1] or [2]). …”

Section: Introductionmentioning

confidence: 99%

Gravity Probe B data analysis: II. Science data and their handling prior to the final analysis

Silbergleit

Conklin

Heifetz

et al. 2015

Class. Quantum Grav.

View full text Add to dashboard Cite

The results of the Gravity Probe B relativity science mission published in Everitt et al (2011 Phys. Rev. Lett. 106 221101) required a rather sophisticated analysis of experimental data due to several unexpected complications discovered on-orbit. We give a detailed description of the Gravity Probe B data reduction. In the first paper (Silbergleit et al Class. Quantum Grav. 22 224018) we derived the measurement models, i.e., mathematical expressions for all the signals to analyze. In the third paper (Conklin et al Class. Quantum Grav. 22 224020) we explain the estimation algorithms and their program implementation, and discuss the experiment results obtained through data reduction. This paper deals with the science data preparation for the main analysis yielding the relativistic drift estimates.

show abstract

“…The predicted Einstein drift rate was -6".606 1 x 10 -6 yr -1 . The four results were combined to give a weighted average of -(6".601 ± 0.018.3) x 10 -6 yr -1 , giving an accuracy of 0.28% (Everitt et al, 2011). Across the span 1961-2003, 250 000 high precision radar observations from the USA and Russia to the inner planets and spacecraft have been examined.…”

Section: Geodetic Precessionmentioning

confidence: 99%

Recent astronomical tests of general relativity

Treschman¹

2015

Int. J. Phys. Sci.

View full text Add to dashboard Cite

Gravity Probe B: Final Results of a Space Experiment to Test General Relativity

Cited by 847 publications

References 10 publications

On Discrete Structure of Geologic Medium and Continual Approach to Modeling Its Movements

On Discrete Structure of Geologic Medium and Continual Approach to Modeling Its Movements

Gravity Probe B data analysis: II. Science data and their handling prior to the final analysis

Recent astronomical tests of general relativity

Contact Info

Product

Resources

About