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arXiv · 2411.15531

The Gravito-Phononic Effect: A Quantum Signature of Linearised Gravity

Germain Tobar·Oscar Berg
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Abstract

The photo-electric effect was a historic milestone in the development of quantum theory, revealing the first evidence of discrete energy of the electromagnetic field through hallmark signatures such as the threshold frequency, intensity-independent energy transfer, and the near instantaneous ejection of photo-electrons. Here, we discuss the photo-electric effect through the lens of semi-classical, quantum, and neo-classical models. We provide a pedagogical outline for how two coupled harmonic oscillators, under a beam-splitter interaction, can exhibit hallmark signatures analogous to the photo-electric effect, including resonance conditions and quantised energy absorption. We discuss the implications of this model for recently proposed graviton detection protocols. This further clarifies that a gravitational version of the photo-electric effect, modelled as discrete energy transfer between harmonic oscillators can provide the first evidence of the graviton.

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Germain Tobar, Oscar Berg. 2024-11-23. The Gravito-Phononic Effect: A Quantum Signature of Linearised Gravity. https://doi.org/10.1016/j.physletb.2025.139785

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