Are black holes in alternative theories serious astrophysical candidates? The Case for Einstein-Dilaton-Gauss-Bonnet black holes

摘要: It is generally accepted that Einstein's theory will get some as yet unknown corrections, possibly large in the strong-field regime. An ideal place to look for these modifications vicinities of compact objects such black holes. Here, we study dilatonic holes, which arise framework Gauss-Bonnet couplings and one-loop corrected four-dimensional effective heterotic superstrings at low energies. These are interesting a prototype alternative, well-behaved gravity theories: they evade 'no-hair' theorem general relativity but were proven be stable against radial perturbations. We investigate viability holes astrophysical try provide means distinguish them from relativity. start by extending previous works establishing stability axial then solutions field equations describing slowly rotating geodesic motion around this geometry. Depending on values mass, dilaton charge, angular momentum solution, one can have differences innermost-stable-circular-orbit location orbital frequency, relative In most favorable cases, difference amounts tomore » few percent. Given current state-of-the-art, discuss difficulty distinguishing correct electromagnetic observations or even with gravitational-wave detectors.« less