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Neutron star electrodynamics in curved space

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Abstract

We calculate the fields surrounding and the power radiated by a slowly rotating neutron star with a frozen-in magnetic dipole field, tilted with respect to the rotation axis, including the effects of spacetime curvature. The general relativistic effects suppress the radiated power relative to flat space by factors up to 1/7 for magnetic dipole radiation and 1/50 for the associated electric quadrupole radiation. This suppression exceeds that which might be expected from a surface red shift alone.

Numerical results are found using power series which describe the behavior of electromagnetic fields exterior to a black hole or slowly rotating neutron star. These new solutions, appropriate near the stellar surface, converge for all radii exterior to the neutron star (or black hole) making analytic continuation of the power series unnecessary as well as allowing matching to a linear combination of asymptotic expansions, appropriate for large radius. Typical numerical values for these functions are presented as well as techniques for accelerating the convergence of their respective power series which make them attractive alternatives to numerical integration.

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Authors and Affiliations

  1. Physics Department, University of Pennsylvania, Philadelphia, Pennsylvania, USA

    Jeffrey M. Cohen

  2. Courant Institute of Mathematical Sciences, New York University, New York, USA

    Jeffrey M. Cohen

  3. Physics Department, University of Pennsylvania, Philadelphia, Pennsylvania, USA

    Michael W. Kearney

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  1. Jeffrey M. Cohen
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  2. Michael W. Kearney
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Supported in part by NSF Grant PHY 77 28356.

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Cohen, J.M., Kearney, M.W. Neutron star electrodynamics in curved space. Astrophys Space Sci 70, 295–328 (1980). https://doi.org/10.1007/BF00639558

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