2002•Communications in Theoretical PhysicsOpen access

Cosmological Constant and Stability of the Cosmological Models

Yongjiu Wang, Zhiming Tang

Abstract

The importance of cosmological constant for the cosmological models is given. The variations of the cosmological model for parameters and were discussed respectively. Near , the cosmological model is unstable with the change of , and near , the cosmological model is unstable with the change of . So when we consider the stable cosmological model, we must consider the nonzero cosmological constant.

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Key concepts: Cosmological constant, Physics, Perfect Cosmological Principle, Lambda-CDM model, Constant (computer programming), Quintessence, Cosmological model, Theoretical physics