Searching for eV-mass Axion-like Particles with Cross Correlations between Line Intensity and Weak Lensing Maps

Understand

We study cross correlations between line intensity and weak lensing maps to search for axion-like particles (ALPs).

• Radiative decay of eV-mass ALPs can contribute to cosmic background emissions at optical and infrared wavelengths.
• Line intensity mapping is a unique means of measuring the background emission at a given photon frequency.
• If ALPs constitute the abundance of cosmic dark matter, line intensity maps can correlate with large-scale structures probed by weak gravitational lensing effects in galaxy imaging surveys.