• Extracting Information from the Gravitational Redshift of Compact Rotating Objects

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      https://www.ias.ac.in/article/fulltext/joaa/031/02/0105-0119

    • Keywords

       

      Maximal angular velocity; stars: neutron; stars: rotation.

    • Abstract

       

      Essential macroscopic internal properties of compact objects can be related to each other with the help of General Relativity. A somewhat familiar example is the relationship between the compactness 𝑀/𝑅 and the gravitational redshift for nonrotating bodies. Rotation poses new challenges when trying to relate observed or potentially observed quantities such as the graviational redshift, mass, radius, and angular velocity. Using a perturbative approach, we present an analytical approximation whose purpose is to relate these quantities. Two main results are highlighted: Derivation of a new maximal angular velocity depending only on the mass of the object and a possible estimate of the radius from a measurement of the gravitational redshift.

    • Author Affiliations

       

      Paul D. Nuñez1 Marek Nowakowski2

      1. Department of Physics & Astronomy, University of Utah, 115 S 1400 E, Salt Lake City, UT 84112 and Observatorio Astronómico, Universidad Sergio Arboleda, Cll. 74 No. 14–14, Bogotá, Colombia.
      2. Departamento de Física, Universidad de los Andes, Cra. 1E No. 18A-10, Bogotá, Colombia.
    • Dates

       
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