Stable Schwarzschild stars as black-hole mimickers

R. A. Konoplya, C. Posada, Z. Stuchlík, and A. Zhidenko
Phys. Rev. D 100, 044027 – Published 13 August 2019

Abstract

The Schwarzschild star is an ultracompact object beyond the Buchdahl limit, which has Schwarzschild geometry outside its surface and positive pressure in the external layer which vanishes at the surface. Recently, it has been shown that the Schwarzschild star is stable against spherically symmetric perturbations. Here we study arbitrary axial nonspherical perturbations and show that the observable quasinormal modes can be as close to the Schwarzschild limit as one wishes, what makes the Schwarzschild star a very good mimicker of a black hole. The decaying time-domain profiles prove that the Schwarzschild star is stable against nonspherical perturbations as well. Another peculiar feature is the absence of echoes at the end of the ringdown. Instead we observe a nonoscillating mode which might belong to the class of algebraically special modes. At asymptotically late times, Schwarzschildian power-law tails dominate in the signal.

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  • Received 29 May 2019

DOI:https://doi.org/10.1103/PhysRevD.100.044027

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

R. A. Konoplya1,2,*, C. Posada1,†, Z. Stuchlík1, and A. Zhidenko1,3,‡

  • 1Institute of Physics and Research Centre of Theoretical Physics and Astrophysics, Faculty of Philosophy and Science, Silesian University in Opava, Bezručovo nám. 13, CZ-746 01 Opava, Czech Republic
  • 2Peoples Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya Street, Moscow 117198, Russian Federation
  • 3Centro de Matemática, Computação e Cognição (CMCC), Universidade Federal do ABC (UFABC), Rua Abolição, CEP: 09210-180, Santo André, SP, Brazil

  • *roman.konoplya@gmail.com
  • camilo.posada@fpf.slu.cz
  • olexandr.zhydenko@ufabc.edu.br

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Issue

Vol. 100, Iss. 4 — 15 August 2019

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