Planckian physics comes into play at Planckian distance from horizon

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Abstract

In the background of a gravitational collapse, we compute the transition amplitudes for the creation of particles for distant observers due to higher-derivative interactions in addition to Hawking radiation. The amplitudes grow exponentially with time and become of order 1 when the collapsing matter is about a Planck length outside the horizon. As a result, the effective theory breaks down at the scrambling time, invalidating its prediction of Hawking radiation. Planckian physics comes into play to decide the fate of black-hole evaporation.

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Ho, P. M., Kawai, H., & Yokokura, Y. (2022). Planckian physics comes into play at Planckian distance from horizon. Journal of High Energy Physics, 2022(1). https://doi.org/10.1007/JHEP01(2022)019

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