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Velocity and velocity bounds in static spherically symmetric metrics

  • Research Article
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Central European Journal of Physics

Abstract

We find simple expressions for velocity of massless particles with dependence on the distance, r, in Schwarzschild coordinates. For massive particles these expressions give an upper bound for the velocity. Our results apply to static spherically symmetric metrics. We use these results to calculate the velocity for different cases: Schwarzschild, Schwarzschild-de Sitter and Reissner-Nordström with and without the cosmological constant. We emphasize the differences between the behavior of the velocity in the different metrics and find that in cases with naked singularity there always exists a region where the massless particle moves with a velocity greater than the velocity of light in vacuum. In the case of Reissner-Nordström-de Sitter we completely characterize the velocity and the metric in an algebraic way. We contrast the case of classical naked singularities with naked singularities emerging from metric inspired by noncommutative geometry where the radial velocity never exceeds one. Furthermore, we solve the Einstein equations for a constant and polytropic density profile and calculate the radial velocity of a photon moving in spaces with interior metric. The polytropic case of radial velocity displays an unexpected variation bounded by a local minimum and maximum.

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Authors and Affiliations

  1. Centro de Investigaciones, Universidad Antonio Nariño, Cra.3 Este No.47A-15, Bogotá, Colombia

    Ivan Arraut

  2. Department of Mathematics, University of the West Indies, Kingston 7, Jamaica

    Davide Batic

  3. Departamento de FÍsica, Universidad de los Andes, Cra.1E No.18A-10, Bogotá, Colombia

    Marek Nowakowski

Authors
  1. Ivan Arraut
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  2. Davide Batic
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  3. Marek Nowakowski
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Correspondence to Davide Batic.

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Arraut, I., Batic, D. & Nowakowski, M. Velocity and velocity bounds in static spherically symmetric metrics. centr.eur.j.phys. 9, 926–938 (2011). https://doi.org/10.2478/s11534-010-0147-0

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  • DOI: https://doi.org/10.2478/s11534-010-0147-0

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