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The fate of observers in circular motion

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arxiv 2202.08850 v1 pith:W7M3XQA6 submitted 2022-02-17 gr-qc astro-ph.HEhep-th

classification gr-qcastro-ph.HEhep-th
keywords circularenergyorbitmassivenewtonianobserversparticlestowards
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In Newtonian physics or in general relativity, energy dissipation causes observers moving along circular orbits to slowly spiral towards the source of the gravitational field. We show that the loss of energy has the same effect in any theory of gravity respecting the weak equivalence principle, by exhibiting an intimate relation between the energy of a massive test particle and the stability of its orbit. Ultimately, massive particles either plunge, or are driven towards minima of the generalized Newtonian potential, where they become static. In addition, we construct a toy metric which displays an unbound innermost stable circular orbit, allowing particles that reach this orbit to be expelled away.

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Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. A new type of multi-branch periodic orbits in dyonic black holes

    gr-qc 2025-08 conditional novelty 7.0 of 10

    Dyonic black holes with non-monotonic metric functions support multiple geometrically distinct but topologically identical periodic orbits for the same rational label, plus bound orbits with energy above unity.

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