Momentum correlations of the Hawking effect in a quantum fluid

• URL: http://arxiv.org/abs/2512.17807v1
• Date: Fri, 19 Dec 2025 17:09:29 GMT
• Title: Momentum correlations of the Hawking effect in a quantum fluid
• Authors: Marcos Gil de Olivera, Malo Joly, Antonio Z. Khoury, Alberto Bramati, Maxime J. Jacquet,
• Abstract summary: We numerically compute the momentum-space two-point correlation function in a quantum fluid.<n>We find signatures that are directly accessible in state-of-the-art experiments.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: The Hawking effect -- the spontaneous emission of correlated quanta from horizons -- can be observed in laboratory systems where an acoustic horizon forms when a fluid transitions from subcritical to supercritical flow. Although most theoretical and experimental studies have relied on real-space observables, the frequency-dependent nature of the Hawking process motivates a momentum-space analysis to access its spectral structure and entanglement features. Here, we numerically compute the momentum-space two-point correlation function in a quantum fluid using the truncated Wigner approximation, a general method applicable to both conservative and driven-dissipative systems. We consider a polaritonic fluid of light in a realistic configuration known to yield strong real-space correlations between Hawking, partner, and witness modes. We find signatures that are directly accessible in state-of-the-art experiments and offer a robust diagnostic of spontaneous emission. Our results form the basis for a new theoretical framework to assess a variety of effects, such as quasi-normal mode emission or modifications of the horizon structure on the Hawking spectrum.

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