Proposed Space Test of the New Equivalence Principle with Rotating Extended Bodies

Han, Fengtian; Wu, Qiuping; Zhou, Zebing; Zhang, Yuan‐Zhong

doi:10.1088/0256-307x/31/11/110401

Cited by 8 publications

(8 citation statements)

References 21 publications

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“…Mohapi et al 6 proposed a general tensor-scalar theory, testing the equivalence principle in the dark sector. Han et al 7 considered an experiment scheme for a space freefall based test of the equivalence principle. Reasenberg 8 applied a new class of test masses to a Galilean test of the equivalence principle.…”

Section: Introductionmentioning

confidence: 99%

Contrastive analysis of two energy gradients in the ultra-strong magnetic fields

Weng

2018

Int. J. Mod. Phys. A

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The paper aims to apply the complex-octonions to explore the variable gravitational mass and energy gradient of several particles in the external ultra-strong magnetic fields. J. C. Maxwell was the first to introduce the algebra of quaternions to study the physical properties of electromagnetic fields. Some scholars follow up this method in the field theories. Nowadays, they employ the complex-octonions to analyze simultaneously the physical quantities of electromagnetic and gravitational fields, including the field potential, field strength, field source, linear momentum, angular momentum, torque, and force. When the octonion force is equal to zero, it is able to deduce eight independent equilibrium equations, especially the force equilibrium equation, precession equilibrium equation, mass continuity equation, and current continuity equation. In the force equilibrium equation, the gravitational mass is variable. The gravitational mass is the sum of the inertial mass and a few tiny terms. These tiny terms will be varied with not only the fluctuation of field strength and of potential energy, but also the spatial dimension of velocity. The study reveals that it is comparatively untoward to attempt to measure directly the variation of these tiny terms of gravitational mass in the ultra-strong magnetic field. However it is not such difficult to measure the energy gradient relevant to the variation of these tiny terms of gravitational mass. In the complex-octonion space, the gravitational mass is a sort of variable physical quantity, rather than an intrinsic property of any physical object. And this inference is accordant with the academic thought of 'the mass is not an intrinsic property any more' in the unified electro-weak theory.

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Section: Introductionmentioning

confidence: 99%

Contrastive analysis of two energy gradients in the ultra-strong magnetic fields

Weng

2018

Int. J. Mod. Phys. A

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“…High Precision Electrostatic Space Accelerometers (HPESAs) are the spaceborne measuring instruments of non-conservative accelerations of space vehicles. They had been and are the main payloads of geodetic satellites, such as the Challenging Minisatellite Payload (CHAMP), the Gravity Recovery, Climate Experiment (GRACE), the Gravity Field and Steady State Ocean Circulation Explorer (GOCE) [ 1 ], the GRACE follow-on [ 2 ] and space fundamental physics [ 3 , 4 ]. The next generation satellite to satellite tracking mission (GRACE-type) and gradiometer mission (GOCE-type) require performances of their HPESAs to be able to achieve the levels of 10

[ 5 ] and

[ 6 ], respectively.…”

Section: Introductionmentioning

confidence: 99%

A Novel Controller Design for the Next Generation Space Electrostatic Accelerometer Based on Disturbance Observation and Rejection

Bai

et al. 2016

Sensors

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The state-of-the-art accelerometer technology has been widely applied in space missions. The performance of the next generation accelerometer in future geodesic satellites is pushed to 8×10−133.33333ptm/normals2/Hnormalz1/2, which is close to the hardware fundamental limit. According to the instrument noise budget, the geodesic test mass must be kept in the center of the accelerometer within the bounds of 56 pm/Hz1/2 by the feedback controller. The unprecedented control requirements and necessity for the integration of calibration functions calls for a new type of control scheme with more flexibility and robustness. A novel digital controller design for the next generation electrostatic accelerometers based on disturbance observation and rejection with the well-studied Embedded Model Control (EMC) methodology is presented. The parameters are optimized automatically using a non-smooth optimization toolbox and setting a weighted H-infinity norm as the target. The precise frequency performance requirement of the accelerometer is well met during the batch auto-tuning, and a series of controllers for multiple working modes is generated. Simulation results show that the novel controller could obtain not only better disturbance rejection performance than the traditional Proportional Integral Derivative (PID) controllers, but also new instrument functions, including: easier tuning procedure, separation of measurement and control bandwidth and smooth control parameter switching.

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“…N. Mohapi et al [16] considered a general tensor-scalar theory that allows testing the equivalence principle in the dark sector. F.-T. Han et al [17] proposed a scheme for a space free-fall based test of the equivalence principle with two rotating extended bodies. R. D. Reasenberg [18] described a new class of test masses for use in a Galilean test of the equivalence principle.…”

Section: Introductionmentioning

confidence: 99%

Physical quantities and spatial parameters in the complex octonion curved space

Weng

2016

Gen Relativ Gravit

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The paper focuses on finding out several physical quantities to exert an influence on the spatial parameters of complex-octonion curved space, including the metric coefficient, connection coefficient, and curvature tensor. In the flat space described with the complex octonions, the radius vector is combined with the integrating function of field potential to become a composite radius vector. And the latter can be considered as the radius vector in a flat composite-space (a function space). Further it is able to deduce some formulae between the physical quantity and spatial parameter, in the complex-octonion curved composite-space. Under the condition of weak field approximation, these formulae infer a few results accordant with the General Theory of Relativity. The study reveals that it is capable of ascertaining which physical quantities are able to result in the warping of space, in terms of the curved composite-space described with the complex octonions. Moreover, the method may be expanded into some curved function spaces, seeking out more possible physical quantities to impact the bending degree of curved spaces.

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Proposed Space Test of the New Equivalence Principle with Rotating Extended Bodies

Cited by 8 publications

References 21 publications

Contrastive analysis of two energy gradients in the ultra-strong magnetic fields

Contrastive analysis of two energy gradients in the ultra-strong magnetic fields

A Novel Controller Design for the Next Generation Space Electrostatic Accelerometer Based on Disturbance Observation and Rejection

Physical quantities and spatial parameters in the complex octonion curved space

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