Two cyclic models with negative varying cosmological constant realize positive energy density, pressure sign flip without NEC violation, and phantom divide crossing near a matter bounce.
Model of the universe including dark energy accounted for by both a quintessence field and a (n egative) cosmological constant,
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Quintessence-dominated cyclic universe with negative cosmological constant
Two cyclic models with negative varying cosmological constant realize positive energy density, pressure sign flip without NEC violation, and phantom divide crossing near a matter bounce.