Resonant production of millicharged scalars in k² > 0 electromagnetic wave background

2025/10/29 by Dmitrieva, Ekaterina, Satunin, Petr
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2510.25505

Abstract

We investigate the solution of the Klein-Gordon equation for a charged scalar particle in an electromagnetic plane wave background with k²>0 which can be realized in a medium with a refractive index n<1. We reduce the equation of motion to the Mathieu equation, which has resonant exponentially growing solutions for certain parameter ranges. We show that this resonance indeed occurs for small scalar masses. We apply our results to derive constraints on millicharged particles and compare them with existing experimental data.

Citations

• Cavendish Tests of Millicharged Particles
• Electric Accumulation of Millicharged Particles
• Tachyonic and parametric resonances for massive particle production in an intense plane wave background
• Nonresonant quantum dynamics of a relativistic electron in counterpropagating laser beams
• Geomagnetic constraints on Millicharged Dark Matter
• Minicharged Particles at Accelerators: Progress and Prospects
• Ultralight Millicharged Dark Matter via Misalignment
• Production of massive bosons from the decay of a massless particle beam

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