Acoustic firewall: how we moved the hottest debate about black holes into a glass of ultracold gas

For forty years, physicists have debated the existence of a 'firewall' at the event horizon of black holes. Researchers have proposed a new way to test this hypothesis by moving the theoretical model into laboratory conditions. Using ultracold gas, scientists created a 'sonic horizon' that mimics the properties of a black hole. During the experiment, a method was developed to capture a specific acoustic signal that should appear at a precise moment in time. According to the authors, this prediction allows the theory to be tested in practice with a single experiment, which could settle the long-standing scientific dispute. This approach opens up new possibilities for studying quantum gravity effects in a controlled environment, allowing physicists to observe processes that were previously considered purely theoretical or inaccessible for direct measurement in space.