Are Very Large Gravitational Redshifts Possible?

Authors:
  • WBW. B. Bonnor
    W. B. Bonnor
  • SWS. B. P. Wickramasuriya
    S. B. P. Wickramasuriya
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Abstract
Solutions of the Einstein–Maxwell equations exist for charged dust in equilibrium under its own gravitational attraction and electrical repulsion. We use these to construct solutions for a sphere and a spheroid. In both cases arbitrarily large gravitational redshifts are possible, but as the spheroid shrinks to a disc, the redshift remains finite. One of the solutions shows clearly how a horizon filters out non-spherically symmetric fields.