What is the chameleon particle?

Answer 1

The chameleon particle is a theoretical particle which has not been proven to exist, and that may be a candidate for the elusive dark matter. The name relates to the concept that its mass can vary (at non-relativistic speeds, the mass of particles is usually fixed) and the idea that despite its non-visibility it may change and be subject to or interact within constraints of electromagnetic force. It would theoretically have no charge nor spin, interact over large distances, and couple to ordinary matter with a strength even less than that of gravity.

Answer 2

The chameleon particle is a hypothetical particle proposed to potentially explain dark energy. It is thought to have the ability to change its mass and interactions depending on its environment, allowing it to evade detection in most experiments. Its existence is still speculative and has not been confirmed by experiments.