A Non-Linear Type Equation of State and Cosmic Fluid Dynamics

2023/04/04 by Shouvik Sadhukhan, Sadhukhan, Shouvik, Alokananda Kar +3
Physics and Astronomy · #Cosmology and Gravitation Theories #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #Relativity and Gravitational Theory #Solar and Space Plasma Dynamics

paper · pdf · doi:10.48550/arxiv.2304.06481

openalex publication_date 2023/04/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

In this chapter we have introduced a special type of non-linear equation of state to discuss the cosmological evolution mechanism. The new equation of state is a four parameters model which can be represented as p=Aρ+Bρ²-(C)/(ρ^α) where B=Aβ-γ. The evolution of universe have been interpreted by fluid dynamics. The reconstruction of Chaplygin gas and Van-Der-Waals (VDW) fluid equation of states have been done from the parametric analysis of this new non-linear model. Different cosmological phases like Quintom, Quintessence and warm universe have been discussed here. Finally, we have provided a comparative studies of this model with other non-linear fluid solutions.

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