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    Echoes of compact objects: New physics near the surface and matter at a distance

    Zdeněk Stuchlík · Leden 01, 2019 · Fyzika · 0 comments
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    Publication date: Jan 2019

    Abstract:
    It is well known that a hypothetical compact object that looks like an
    Einsteinian (Schwarzschild or Kerr) black hole everywhere except a small
    region near its surface should have the ringdown profile predicted by
    the Einstein theory at early and intermediate times, but modified by the
    so-called echoes at late times. A similar phenomenon appears when one
    considers an Einsteinian black hole and a shell of matter placed at some
    distance from it, so that astrophysical estimates could be made for the
    allowed mass of the black hole environment. While echoes for both
    systems have been extensively studied recently, no such analysis has
    been done for a system featuring phenomena simultaneously, that is,
    echoes due to new physics near the surface/event horizon and echoes due
    to matter at some distance from the black hole. Here, following Damour
    and Solodukhin [Phys. Rev. D 76, 024016 (2007),
    10.1103/PhysRevD.76.024016] and Cardoso et al. [Phys. Rev. Lett. 116,
    171101 (2016), 10.1103/PhysRevLett.116.171101], we consider a
    traversable wormhole obtained by identifying two Schwarzschild metrics
    with the same mass M at the throat, which is near the Schwarzschild
    radius, and add a nonthin shell of matter at a distance. This allows us
    to understand how the echoes of the surface of the compact object are
    affected by the astrophysical environment at a distance. The
    straightforward calculations for the time-domain profiles of such a
    system support the expectations that if the echoes are observed, they
    should most probably be ascribed to some new physics near the event
    horizon rather than some „environmental“ effect.

    Authors:
    Konoplya, R. A.; Stuchlík, Z.; Zhidenko, A.;

    https://ui.adsabs.harvard.edu/abs/2019PhRvD..99b4007K

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