Decaying dark matter is mapped to a scalar field model that requires phantom dark energy and is reinterpreted via a complex scalar with ultra-light mass to form a unified dark fluid whose phantom phase is a stable late-time attractor.
Now the constraint allows turning points (in principle, the caseu′ = 0can occur, although we have already established that it does not correspond to an extremum)
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Correspondence between a decaying dark matter sector scenario and scalar field model
Decaying dark matter is mapped to a scalar field model that requires phantom dark energy and is reinterpreted via a complex scalar with ultra-light mass to form a unified dark fluid whose phantom phase is a stable late-time attractor.