Revised research about chaotic dynamics in Manko et al. spacetime - General Relativity and Quantum CosmologyReport as inadecuate




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Abstract: A recent work by Dubeibe et al. Phys. Rev. D 75, 023008 2007 stated thatchaos phenomenon of test particles in gravitational field of rotating neutronstars which are described by Manko, Sanabria-Gomez, and Manko Manko et al.metric can only occur when the stars have oblate deformation. But the chaoticmotions they found are limited in a very narrow zone which is very close to thecenter of the massive bodies. This paper argues that this is impossible becausethe region is actually inside of the stars, so the motions cannot exist at thisplace. In this paper, we scan all parameters space and find chaos and unstablefixed points outside of stars with big mass-quadrupole moments. Thecalculations show that chaos can only occur when the stars have prolatedeformation. Because real deformation of stars should be oblate, all orbits oftest particles around the rotating neutron stars described by Manko et al.solutions are regular. The case of nonzero dipolar magnetic moment has alsobeen taken into account in this study.



Author: Wen-Biao Han

Source: https://arxiv.org/







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