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We study the perception of Hawking radiation by different observers outside ablack hole. The analysis is done in terms of an effective-temperature functionthat varies along the trajectory of each observer. The vacuum state of theradiation field is chosen to be non-stationary, so as to mimic the switching-onof Hawking radiation that would appear in a real black hole collapse. Weanalyse how this vacuum is perceived by observers staying at a fixed radius, byobservers coming in free-fall from radial infinity at different times, and byobservers in free-fall released from finite radial positions. Results foundhave a compelling physical interpretation. One main result, at firstunexpected, is that in general free-falling observers do perceive particleemission by the black hole when crossing the event horizon. This happensbecause of a diverging Doppler shift at the event horizon.

Hawking radiation as perceived by different observers (ERE2011 proceedings)