The Echo Method for Axion Dark Matter Detection

Summary

This paper proposes and analyzes the 'Echo Method' for detecting axion dark matter, which relies on the stimulated decay of axions backscattering radio/microwave radiation.

Key findings

• Axion dark matter can cause backscattering of radio/microwave radiation.
• The backscattered signal is a narrow echo centered near half the axion mass.
• Analytical formulas for the echo signal are presented.
• Sensitivity prospects for future experiments are discussed.

Methods

• Theoretical analysis of stimulated axion decay.
• Derivation of analytical formulas for the echo signal.
• Estimation of experimental sensitivity.

Limitations

• The echo signal is described as 'feeble'.
• The method's sensitivity depends on future experimental capabilities.

Applications

• Dark matter detection.
• Axion detection.