The chameleon particle is a hypothetical scalar particle that is believed to couple to all matter more weekly then gravitational force. It is described as the fifth force of nature due to its variable effective mass which is caused as a result of a nonlinear self-interaction which acts as an increasing function of the ambient energy density. This means that the range of the force propagated by the particle is expected to be very small in regions of high density and extremely large in regions of low density. This is also the reason why it has been postulated as a dark energy candidate, This new energy can range up to several thousands of parsecs when compared with the low-density intergalactic regions and therefore explains the principle of dark energy which cannot be we studied upon because it does not interact with matter the same way as other energies do and the chameleon particle, therefore, proves the acceleration of the universe expansion in its model.
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