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    The Pioneer effect and Spacecraft flyby anomaly

    Does general relativity explain the Pioneer effect and the spacecraft flyby anomaly? I have seen several papers on those two topics but no GR explanation.
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    The principle of equivalence

    What’s your understanding of the principle of equivalence? In the literature, I find two meanings: (1) Gravitational mass is numerically equal to inertial “mass.” (This is a postulate.) (2) A mass at rest in a frame is equivalent to being in a “gravitational field” in an accelerated frame...
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    Is time quantum at the microscopic level?

    Time has always baffled me. I have two questions for you. 1. What's the genesis of time? 2. Is time quantum at the microscopic level? Thank you.
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    Quantum of time

    Is there a quantum of time? What’s the smallest interval of time in which acceleration can place? – on the earth? – on the sun? – on a black hole? A chronon is the time that light takes to cover classical electron radius. The other is the Planck time. But these won't serve my purpose, when I...
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    Gravitational wave/pulse

    I need a reference. The orbits of pulsars PSR 1913+16 are shrinking. It seems that is because of the energy the pulsars are losing by emitting gravitational waves. General relativity predicts that. So far, so good; now the question. Is there an article where I can find the...
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    I have a question on pseudogravity as invoked in thought experiments

    I have a question on pseudogravity as invoked in thought experiments related to the principle of equivalence. One invents ‘gravity’ opposite to an accleration to explain weightlessness, the bending of light beam, the dilatation of time period, and twin paradox. I can explain all of the above...
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    Anomalous precession

    There is so much confusion regarding the anomalous precession of Mercury's orbit. Mercury's orbit precesses at 575 arc-secs a century. Classical mechanics accounts for all except the anomalous 43 arc-secs. General relativity (curved space-time) accounts for the 43 secs. There are other theories...
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    Gravity's effects

    General relativity finds that gravity dilates the wavelength of light and the time period of an atomic clock. What does gravity do to the length of a (material) rod? If you know the answer, please cite me a reference or two.
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    Spacetime curvature

    General relativity has it that the spacetime continuum is curved. The physics of continuum is dealt with [stress] tensors. My questions: (1) The presence of a mass creates the curvature in spacetime. By how? (2) If the curvature due to matter is positive, is the curvature due to antimatter...
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    What is inertia? What is its source?

    What is inertia? What is its source? Is inertial mass mass? Do gravitational mass and inertial mass have the same sign?