Abstract
We investigate the geodesics’ kinematics and dynamics in the Linet–Tian metric with \(\Lambda <0\) and compare with the results for the Levi–Civita metric, when \(\Lambda =0\). This is used to derive new stability results about the geodesics’ dynamics in static vacuum cylindrically symmetric spacetimes with respect to the introduction of \(\Lambda <0\). In particular, we find that increasing \(|\Lambda |\) always increases the minimum and maximum radial distances to the axis of any spatially confined planar null geodesic. Furthermore, we show that, in some cases, the inclusion of any \(\Lambda <0\) breaks the geodesics’ orbit confinement of the \(\Lambda =0\) metric, for both planar and non-planar null geodesics, which are therefore unstable. Using the full system of geodesics’ equations, we provide numerical examples which illustrate our results.
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Acknowledgments
IB and FM thank CMAT, Univ. Minho, for support through the FEDER Funds-COMPETE and FCT Project Est-C/MAT/UI0013/2011. FM is also supported by FCT projects PTDC/MAT/108921/2008 and CERN/FP/123609/2011 and thanks the warm hospitality from Instituto de Física, UERJ, Rio de Janeiro, where this work was completed. MFAdaSilva acknowledges the financial support from FAPERJ (Nos. E-26/171.754/2000, E-26/171.533.2002, E-26/170.951/2006, E-26/110.432/2009 and E-26/111.714/2010), Conselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq—Brazil (Nos. 450572/2009-9, 301973/2009-1 and 477268/2010-2) and Financiadora de Estudos e Projetos—FINEP—Brazil.
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Brito, I., Da Silva, M.F.A., Mena, F.C. et al. Geodesics dynamics in the Linet–Tian spacetime with \(\Lambda <0\) . Gen Relativ Gravit 46, 1681 (2014). https://doi.org/10.1007/s10714-014-1681-7
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DOI: https://doi.org/10.1007/s10714-014-1681-7