Abstract
The motion of a sufficiently small body in general relativity should be accurately described by a geodesic. However, there should be “gravitational self-force” corrections to geodesic motion, analogous to the “radiation reaction forces” that occur in electrodynamics. It is of considerable importance to be able to calculate these self-force corrections in order to be able to determine such effects as inspiral motion in the extreme mass ratio limit. However, severe difficulties arise if one attempts to consider point particles in the context of general relativity. This article describes these difficulties and how they have been dealt with.
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Notes
- 1.
The product of two distributions can be defined if the decay properties of their Fourier transforms are such that the Fourier convolution integral defining their product converges. This will be the case when the wavefront sets of the distributions satisfy an appropriate condition (see [8]).
- 2.
“Strings” – that is, objects with a distributional stress–energy tensor corresponding to a delta-function with support on a timelike surface of co-dimension two – are a borderline case; see [5].
- 3.
This follows immediately from “elliptic regularity,” since the difference between two Green’s functions satisfies the source free Laplace equation (4).
- 4.
This is not true in the Lorentzian case; the singular behavior of, for example, the retarded, advanced, and Feynman propagators are different from each other.
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Acknowledgements
This research was supported in part by NSF grant PHY04-56619 to the University of Chicago.
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Wald, R.M. (2009). Introduction to Gravitational Self-Force. In: Blanchet, L., Spallicci, A., Whiting, B. (eds) Mass and Motion in General Relativity. Fundamental Theories of Physics, vol 162. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-3015-3_8
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