A Cosmological Model Describing the Early Inflation, the Intermediate Decelerating Expansion, and the Late Accelerating Expansion of the Universe by a Quadratic Equation of State

Universe

Pierre-Henri Chavanis¹  Kazuharu Bamba¹ 

[1] Laboratoire de Physique Théorique, Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse, France; E-Mail

关键词: inflation;    dark matter;    dark energy;    polytropic equation of state;   

DOI  :  10.3390/universe1030357

来源: mdpi

【 摘 要 】

We develop a cosmological model based on a quadratic equation of stateand exists eternally in the past (although it may be incorrect to extrapolate the solution to the infinite past). On the other hand, it admits a scalar field interpretation based on an inflaton, quintessence, or tachyonic field. Our model generalizes the standard ΛCDM model by incorporating naturally a phase of early inflation that avoids the primordial singularity. Furthermore, it describes the early inflation, the intermediate decelerating expansion, and the late accelerating expansion of the universe simultaneously in terms of a single equation of state. We determine the corresponding scalar field potential that unifies the inflaton and quintessence potentials.

【 授权许可】

CC BY   
© 2015 by the author; licensee MDPI, Basel, Switzerland.