Recent content by learner91

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    I Galilean Equivalence Principle: Extended Objects

    GEP=Galilean equivalence principle. It is the same as the WEP=weak equivalence principle. Actually, now I think it isn't. If ##g(x)## is the position-varying gravitational field, then we want to find some ##\bar x## such that ##\ddot{\bar x}=g(\bar x)##. The center of mass does the trick for a...
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    I Galilean Equivalence Principle: Extended Objects

    Extended objects of different shapes and different masses generally will be spinning in different ways while falling, but their centers of mass move along the same trajectory, which is the same as that of any point-mass in free-fall in the same gravitational field and with the same initial...
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    I Galilean Equivalence Principle: Extended Objects

    Is this due to the fact that the extended object may be spinning? I vaguely recall that spinning objects in GR do not move on geodesics. I am more interested in understanding whether the fact that the object is extended, and therefore can probe inhomogeneities in the field, invalidates the GEP...
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    I Galilean Equivalence Principle: Extended Objects

    The Galilean equivalence principle (or weak equivalence principle) is the statement of the universality of free-fall under gravity. For example, according to Wikipedia, it can be stated as follows My question regards the limitation of the principle to point masses. Does universality of...
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