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.
3: Evolution of Λ, ρ, p, w and q as a function of the cosmic time t for MBS: (a) The positive Λ ansatz (formula (2.7)) with the new proposed one for negati ve Λ (formula (3.3))
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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.