'Smaller than the tiniest scale in nature': Physicists made a black hole out of light and used it to test S...

Key Points:

• Physicists have successfully simulated Hawking radiation using an optical fiber setup, observing both the radiation and its back reaction on the black hole analogue for the first time, providing new insights into black hole evaporation.
• The experiment recreated an artificial event horizon by sending a strong pump pulse through a photonic-crystal fiber, which altered light behavior to mimic a black hole’s boundary, allowing a weaker probe pulse to interact and generate Hawking radiation.
• The detected Hawking radiation matched theoretical predictions, showing a thermal glow with a specific temperature and spectrum, even in conditions where classical black hole descriptions break down.
• Crucially, the team observed the back reaction effect, where the radiation’s creation caused a measurable recoil in the pump pulse, analogous to the energy loss that would cause a real black hole to slowly evaporate.
• This tabletop experiment addresses fundamental physics conflicts between quantum mechanics and general relativity, and the researchers aim to advance it further by exploring quantum features like entanglement in future studies.