Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2007-03-29
Proc.Roy.Soc.Lond.A463:2609-2630,2007
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
18 pages
Scientific paper
10.1098/rspa.2007.1896
The behaviour of the Maxwell field near one of the spatial infinities of the Schwarzschild solution is analysed by means of the transport equations implied by the Maxwell equations on the cylinder at spatial infinity. Initial data for the Maxwell equations will be assumed to be expandable in terms of powers of a coordinate $\rho$ measuring the geodesic distance to spatial infinity (in the conformal picture) and such that the highest possible spherical harmonics at order $p$ are $2^p$-polar ones. It is shown that if the $2^p$-polar harmonics at order $p$ in the initial data satisfy a certain regularity condition then the solutions to the transport equations at orders $p$ and $p+1$ are completely regular at the critical sets where null infinity touches spatial infinity. On the other hand, the solutions to the transport equations of order $p+2$ contain, in general, logarithmic singularities at the critical sets. It is expected that the ideas and techniques developed in the analysis of this problem can be employed to discuss the more challenging case of the transport equations implied by the conformal Einstein equations, and thus provide a way of constructing a proof of a certain rigidity conjecture concerning the developments of conformally flat initial data sets.
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