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PIRSA Number:

12100094

* Quantum-gravity effects as noise for
gravity-wave detectors*I discuss a mechanism that can allow Planck scale effects to manifest themselves as a source of lof-frequency noise for interferometers. The mechanism requires a discrete formulation of dynamics at the Planck scale.

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There have recently been a number of rather surprising suggestions

that the quantum nature of black holes is manifested on macroscopic

scales. This raises the question of just what the image of such an

object should look like. The answer is more than simply academic; with

the advent of the Event Horizon Telescope (EHT), a millimetre-wave very

long baseline array, it is now possible to probe a handful of

supermassive black holes with angular resolutions sufficient to image

their horizons. I will discuss what we might expect to see, and how in

the near future we will begin to empirically probe the existence of

black hole quantum states with horizon scale curvature deviations from

general relativity.

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modified. Without Lorentz invariance one can theoretically see behind

the usual Killing horizon of a black hole if, for example, one allowed

for superluminal propagation. This in turn raises the possibility that

one could in principle probe the singularity and the quantum gravity

regime. We discuss how Lorentz violating black hole solutions in

Einstein-aether theory unfortunately possess another causal boundary

behind the Killing horizon that is impenetrable to any superluminal

mode. We also detail progress in determining the laws of black hole

mechanics and the radiation spectrum from these so-called "universal

horizons". Our results suggest that even if superluminal dispersion at

high frequencies did exist in nature, singularities and their associated

quantum gravity resolutions may very well remain locked behind

horizons.

©2012 Institut Périmètre de Physique Théorique