Light-ring pairs from A -discriminantal varieties
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DOI: 10.1103/physrevd.104.104012
Abstract: When geodesic equations are formulated in terms of an effective potential U , circular orbits are characterised by U = ∂aU = 0. In this paper we consider the case where U is an algebraic… read more here.
Keywords: pairs discriminantal; ring pairs; light ring; discriminantal varieties ... See more keywords
Light ring behind wormhole throat: Geodesics, images, and shadows
Sign Up to like & getrecommendations! Published in 2023 at "Physical Review D"
DOI: 10.1103/physrevd.107.104060
Abstract: The geodesics of the Ellis-Bronnikov wormhole with two parameters are studied. The asymmetric wormhole has only one light ring and one innermost stable circular orbit located on one side of the wormhole throat. Consequently, certain… read more here.
Keywords: behind wormhole; wormhole throat; throat geodesics; light ring ... See more keywords
Light-Ring Stability for Ultracompact Objects.
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DOI: 10.1103/physrevlett.119.251102
Abstract: We prove the following theorem: axisymmetric, stationary solutions of the Einstein field equations formed from classical gravitational collapse of matter obeying the null energy condition, that are everywhere smooth and ultracompact (i.e., they have a… read more here.
Keywords: stability ultracompact; light rings; ultracompact objects; energy ... See more keywords