Virtual axion-like particle complement to Euler-Heisenberg-Schwinger action
Stefan Evans, Johann Rafelski
TL;DR
This paper extends the Euler-Heisenberg-Schwinger action to include virtual axion-like particles, providing a new way to experimentally constrain ALP properties and explore their effects in quantum electrodynamics.
Contribution
It introduces a modified action incorporating ALP effects and characterizes the regime where these effects dominate over traditional QED vacuum effects.
Findings
Derived measurable additions to the EHS action due to ALPs
Established experimental constraints on ALP mass and coupling
Proposed vacuum effect probing as an alternative ALP search method
Abstract
We modify action in an external electromagnetic field to include effects of virtual axion-like particle (ALP) excitations. A measurable addition to QED-Euler-Heisenberg-Schwinger (EHS) action is obtained and incorporated into experimental constraints placed on ALP mass and coupling to two photons. The regime of these constraints in which the ALP vacuum effect surpasses the EHS effect is characterized. We show that probing of the virtual vacuum effect offers an alternative method in search for physics related to ALPs.
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