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We revisit the hypothesis of a possible line structure in the Hawkingevaporation spectrum of black holes. Because of nonperturbative quantum gravityeffects, this would take place arbitrarily far away from the Planck mass. Weshow, based on a speculative but consistent hypothesis, that this naiveprediction might in fact hold in the specific context of loop quantum gravity.A small departure from the ideal case is expected for some low-spin transitionsand could allow us to distinguish several quantum gravity models. We also showthat the effect is not washed out by the dynamics of the process, by existenceof a mass spectrum up to a given width, or by the secondary component inducedby the decay of neutral pions emitted during the time-integrated evaporation.

Evaporation Spectrum of Black Holes from a Local Quantum Gravity Perspective