• Finite escape fraction for ultrahigh energy collisions around Kerr naked singularity

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      https://www.ias.ac.in/article/fulltext/pram/084/04/0491-0501

    • Keywords

       

      Black holes; cosmic censorship; particle acceleration.

    • Abstract

       

      We investigate the issue of observability of high-energy collisions around Kerr naked singularity and show that results are in contrast with the Kerr black hole case. We had shown that it would be possible to have ultrahigh energy collisions between the particles close to the location 𝑟 = M around the Kerr naked singularity if the Kerr spin parameter transcends unity by an infinitesimally small amount 𝑎 $\to$ 1+. The collision is between initially ingoing particle that turns back as an outgoing particle due to angular momentum barrier, with another ingoing particle. We assume that two massless particles are produced in such a collision and their angular distribution is isotropic in the centre-of-mass frame. We calculated the escape fraction for the massless particles to reach infinity. We showed that the escape fraction is finite and approximately equal to half for the ultrahigh energy collisions. Therefore, the particles produced in high-energy collisions would escape to infinity providing the signature of the nature of basic interactions at those energies. This result is in contrast with the case of extremal Kerr black hole where almost all particles produced in high-energy collisions are absorbed by the black hole rendering collisions unobservable.

    • Author Affiliations

       

      Mandar Patil1 2 Pankaj S Joshi1

      1. Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India
      2. Inter-University Centre for Astronomy and Astrophysics, P.O. Box 4, Ganeshkhind, Pune 411 007, India
    • Dates

       
  • Pramana – Journal of Physics | News

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