In one minute

Muñoz de Nova, Golubkov, Kolobov and Steinhauer measure the correlation spectrum of Hawking radiation from an analogue black hole and find it thermal, at the temperature set by the analogue surface gravity. The radiation sits in the linear dispersion regime, as for a real black hole. Inside the analogue horizon, the radiation consists only of negative-energy partner particles. The work confirms Hawking's predictions for both the value of the temperature and the thermal shape of the spectrum. Correlations between Hawking and partner particles show the analogue black hole has no analogue firewall, bearing directly on the information paradox.

Observation of thermal Hawking radiation and its temperature in an analogue black hole