Time varying gratings model Hawking radiation

• URL: http://arxiv.org/abs/2302.04066v1
• Date: Wed, 8 Feb 2023 14:02:56 GMT
• Title: Time varying gratings model Hawking radiation
• Authors: Simon A. R. Horsley and John B. Pendry
• Abstract summary: We show that wave energy can be trapped and amplified, leading to radiation from the quantum vacuum state. We calculate the spectrum of this emitted radiation, finding a quasi-thermal spectrum with features that depend on the grating profile.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Diffraction gratings synthetically moving at trans-luminal velocities contain points where wave and grating velocities are equal. We show these points can be understood as a series of optical event horizons where wave energy can be trapped and amplified, leading to radiation from the quantum vacuum state. We calculate the spectrum of this emitted radiation, finding a quasi-thermal spectrum with features that depend on the grating profile, and an effective temperature that scales exponentially with the length of the grating, emitting a measurable flux even for very small grating contrast.

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