Abstract We consider the dynamics of a charged particle (e.g., an electron) oscillating in a laser field in flat spacetime and describe it in terms of the variable mass metric. By applying Einstein's equivalence principle, we show that, after representing the electron motion in a time-dependent manner, the variable mass metric takes the form of the Friedmann–Lemaître–Robertson–Walker metric. We quantize a pseudo-scalar field in this spacetime and derive the production rate of electrically neutral, spinless particles. We show that this approach can provide an alternative experimental method to axion searches.
- charged particle dynamics
- equivalence principle
- electron motion
Wadud, M. A., King, B., Bingham, R., & Gregori, G. (2018). Axion particle production in a laser-induced dynamical spacetime. Physics Letters B, 777, 388-393. https://doi.org/10.1016/j.physletb.2017.12.039