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25
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84950529819
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Reference 1.
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26
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85038190377
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The singularity at [formula omitted] present in this example is not an essential feature of a “singular” problem.
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The argument could have been pursued with a function such as [formula omitted] at the cost of complicating Fig. 1.
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28
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85038176502
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Actually, we have here a very simple analog of the “Stokes’ paradox.” In 1851 Stokes proposed a simplified set of equations for viscous flow past a finite object, valid for the case of very low Reynold’s number. For 2-dimensional flow, all nontrivial solutions of Stokes’ equations diverge logarithmically at infinity. This “paradox” was resolved by Kaplun, who pointed out in 1954 that Stokes’ equations are only inner equations and their solutions are not valid far from the body.
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See Ref. 25.
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30
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85038179725
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The spurious solutions can be eliminated easily if the equations are solved by the method of two-time scales.
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Before a numerical solution is attempted, one should eliminate the higher derivative terms by differentiating the approximate equation and using that to eliminate the third derivative, etc.
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31
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85038184694
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Runaway solutions also appear in some mechanical systems, for example, in the case of the spherically symmetric pulsations of a sphere which as a result radiates monopole sound waves. A more complete exposition of this material can be found
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(1970)
Phys. Rev. A
, vol.2
, pp. 1501
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35
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85038193501
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This paper uses the sign conventions recommended by C. W. Misner, K. S. Thorne, and J. A. Wheeler (“Open Letter to Relativity Theorists,” August 19, 1968), with signature [formula omitted]
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36
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85038185036
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This κ is quite similar to the coupling parameter κ which appeared in the string problem.
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The reader might enjoy working out the slow-motion approximation for the spring-string system, relaxing the requirement that [formula omitted]
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37
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85038177743
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We have, for example, [formula omitted] and will always take the contravariant components as our 3-vectors.
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38
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85038184025
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Since ρ is real we have [formula omitted] thus the F defined in Eq. (136) is real as is [formula omitted]
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40
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85038183282
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Warning! Remember that we have calculated only the leading time-odd term in H. There are much larger time-even, post-Newtonian, and post-post-Newtonian corrections that have been ignored.
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42
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85038180865
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Ref. 32.
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43
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85038177520
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Use [formula omitted] and [formula omitted]
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