Browsing Department of Materials Science and Metallurgy by Subject "classical theories of gravity"

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  • Evanescent ergosurfaces and ambipolar hyperkähler metrics 

    Niehoff, Benjamin E; Reall, Harvey Stephen (SpringerJournal of High Energy Physics, 2016-04-20)
    A supersymmetric solution of 5d supergravity may admit an ‘evanescent ergosurface’: a timelike hypersurface such that the canonical Killing vector field is timelike everywhere except on this hypersurface. The hyperkähler ...

  • Is there a breakdown of effective field theory at the horizon of an extremal black hole? 

    Hadar, S; Reall, Harvey Stephen
    © 2017, The Author(s). Linear perturbations of extremal black holes exhibit the Aretakis instability, in which higher derivatives of a scalar field grow polynomially with time along the event horizon. This suggests that ...