From Quadratic Gravity to Observation Speaker(s): Jing Ren
Abstract: : Astrophysical black hole candidates might be horizonless ultracompact objects. Of particular interest is the plausible fundamental connection with quantum gravity. The puzzle is then why we shall expect Planck scale corrections around the horizon of a macroscopic black hole.
Taking asymptotically free quadratic gravity as a possible candidate of UV completion of general relativity, I will show how the wouldbe horizon can be naturally replaced by a tiny interior as dictated by the dynamics. The new horizonless 22hole, as a quite generic static solution sourced by sufficiently dense matter, may then be the nearly black endpoint of gravitational collapse. In the era of gravitational wave astronomy, echoes in the postmerger phase provide a great opportunity to probe such scenario.
Given the uncertainties associated with the waveform of echoes, I will discuss some modelindependent search strategies, where the primary task is to find the time delay between echoes. The search range is then motivated by the Planck scale deviation outside the wouldbe horizon.
Date: 09/11/2017  2:20 pm
Collection: Quantum Black Holes in the Sky?
