Spectroscopy of a canonically quantized horizon
Abstract
Deviations from Hawking's thermal black hole spectrum, observable for macroscopic black holes, are derived from a model of a quantum horizon in loop quantum gravity. These arise from additional area eigenstates present in quantum surfaces excluded by the classical isolated horizon boundary conditions. The complete spectrum of area unexpectedly exhibits evenly spaced symmetry. This leads to an enhancement of some spectral lines on top of the thermal spectrum. This can imprint characteristic features into the spectra of black hole systems. It most notably gives the signature of quantum gravity observability in radiation from primordial black holes, and makes it possible to test loop quantum gravity with black holes well above Planck scale.
 Publication:

Nuclear Physics B
 Pub Date:
 November 2007
 DOI:
 10.1016/j.nuclphysb.2007.01.009
 arXiv:
 arXiv:hepth/0607081
 Bibcode:
 2007NuPhB.783..179A
 Keywords:

 High Energy Physics  Theory;
 General Relativity and Quantum Cosmology
 EPrint:
 49 pages, 8 figures. Published in section: Field Theory And Statistical Systems