Third sound detectors in accelerated motion

Author:

Bunney Cameron R DORCID,Barroso Vitor SORCID,Biermann Steffen,Geelmuyden August,Gooding CiscoORCID,Ithier GrégoireORCID,Rojas XavierORCID,Louko JormaORCID,Weinfurtner SilkeORCID

Abstract

Abstract An accelerated observer moving through empty space sees particles appearing and disappearing, while an observer with a constant velocity does not register any particles. This phenomenon, generally known as the Unruh effect, relies on an initial vacuum state, thereby unifying the experience of all inertial observers. We propose an experiment to probe this observer-dependent detector response, using a laser beam in circular motion as a local detector of superfluid helium-4 surface modes or third sound waves. To assess experimental feasibility, we develop a theoretical framework to include a non-zero temperature initial state. We find that an acceleration-dependent signal persists, independent of the initial temperature. By introducing a signal-to-noise measure we show that observing this signal is within experimental reach.

Funder

Research and Innovation Science and Technology Facilities Council

Science and Technology Facilities Council on Quantum Simulators for Fundamental Physics

Science and Technology Facilities Council

Royal Society Enhancements Awards and Grants

Royal Society University Research Fellowship

Leverhulme Research Leadership Award

Publisher

IOP Publishing

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