Weak Gravitational Lensing as a Method to Constrain Unstable Dark Matter

Understand

The nature of the dark matter remains a mystery.

• The possibility of an unstable dark matter particle decaying to invisible daughter particles has been explored many times in the past few decades.
• Meanwhile, weak gravitational lensing shear has gained a lot of attention as a probe of dark energy.
• Weak lensing is a useful tool for constraining the stability of the dark matter.