TL;DR
This paper introduces a novel cosmological zitterbewegung effect for free Dirac particles in expanding spacetimes, arising from mode mixing, and discusses its potential laboratory observation.
Contribution
It presents the first theoretical description of cosmological zitterbewegung as a physically real effect caused by mode mixing in curved spacetime.
Findings
Zitterbewegung occurs in cosmological spacetimes due to mode mixing.
The effect is physically attainable and not just theoretical.
Potential laboratory observation with trapped ions is discussed.
Abstract
We describe a new phenomenon of zitterbewegung of a free Dirac particle in cosmological spacetimes. Unlike the similar effect theorized by Schrodinger in 1930, the cosmological zitterbewegung is a real, physically attainable effect, which originates from the mixing of positive and negative frequency modes of a field operator in cosmological spacetimes. We briefly discuss the potential for observing this effect in laboratory experiments with trapped ions.
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