Abstract
For a plane gravitational wave whose profile is given, in Brinkmann coordinates, by a \(2\times 2\) symmetric traceless matrix K(U), the matrix Sturm–Liouville equation \(\ddot{P}=KP\) plays a multiple and central rôle: (i) it determines the isometries; (ii) it appears as the key tool for switching from Brinkmann to BJR coordinates and vice versa; (iii) it determines the trajectories of particles initially at rest. All trajectories can be obtained from trivial “Carrollian” ones by a suitable action of the (broken) Carrollian isometry group.
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Notes
The Carroll group [13, 14] is the subgroup of the Bargmann group with no time translations; the latter is itself the subgroup of the Poincaré group which leaves \({\partial }_V\) invariant. The Bargmann group is a 1-parameter central extension of the Galilei group upon which it projects when translations along V are factored out. For circularly polarised periodic waves the symmetry can be extend to a 6-parameter group [11, 16].
The conserved quantity associated with the “vertical” Killing vector \({\partial }_V\) can be used to show that proper time and u are proportional.
Comparison with the trajectories obtained by solving directly the equations of motion numerically shows a perfect overlapping. This is a third appearance of the solution P of the SL eqn (3.2). In Souriau’s approach it is the determinant of the metric (2.1) which satisfies a Sturm–Liouville equation.
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Acknowledgements
We are grateful to Christian Duval for his contribution at the early stages of this project, and to an anonymous referee for drawing our attention to [27] of which were were previously unaware. ME and PH thank the Institute of Modern Physics of the Chinese Academy of Sciences in Lanzhou for hospitality. This work was supported by the Chinese Academy of Sciences President’s International Fellowship Initiative (No. 2017PM0045), and by the National Natural Science Foundation of China (Grant No. 11575254). PH would like to acknowledge also the organizers of the “Workshop on Applied Newton–Cartan Geometry” and the Mainz Institute for Theoretical Physics (MITP), where part of this work was completed. We are grateful to our colleagues to inform us about their work in progress [33].
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Zhang, PM., Elbistan, M., Gibbons, G.W. et al. Sturm–Liouville and Carroll: at the heart of the memory effect. Gen Relativ Gravit 50, 107 (2018). https://doi.org/10.1007/s10714-018-2430-0
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DOI: https://doi.org/10.1007/s10714-018-2430-0