## Extended complex scalar field as a quintessence.(English)Zbl 1057.83026

Summary: We show the possibility that an extended complex scalar field can be considered as an extended complex quintessence model. For this model, we derive the basic equations with a parameter $$\eta$$ which govern the evolution of the Universe. Our model may contain a complex quintessence model for $$\eta=-1$$ and a real quitessence model for $$\eta=0$$.

### MSC:

 83F05 Relativistic cosmology 83C55 Macroscopic interaction of the gravitational field with matter (hydrodynamics, etc.)

### Keywords:

expansion of the universe; critical energy density
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