On gravitational conductors,waveguides, and circuits |
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Authors: | William H. Press |
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Affiliation: | (1) Department of Physics, Harvard University, USA;(2) Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, 02138 Cambridge, Massachusetts, USA |
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Abstract: | We show that a material with sufficiently large elastic shear modulus or shear viscosity will act like a gravitational conductor or metal. It will reflect gravitational waves, and it can be used to make gravitational waveguides and circuits. Unlike electromagnetism, a gravitational wave can be guided by a single conductor in transverse mode. Gravitational conductors can obey the dominant energy condition, and they can be larger than their Schwarzschild radius, but they must violate a new condition that is probably satisfied by all existing forms of matter. Direct-current gravitational circuits, although limits of guided gravitational waves, have a simple Newtonian interpretation.This essay is a slightly expanded version of one that received an honorable mention (1978) from the Gravity Research Foundation-Ed.Work supported in part by NSF grant No. PHY78-09616. |
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