A Matter with an effective EoS interacting with a tachynic field in an accelerating Universe

Abstract

We consider a fluid described by a parameterized EoS of the general form $P=(\gamma -1)\rho +p_0+{\omega }_{H}H+{\omega }_{H2}{H}^2+{\omega }_{dH}\dot{H}$ \cite{Ren}, where $p_0$, ${\omega }_H$, ${\omega }_{H2}$ and ${\omega }_{dH}$ are free parameters of the model, interacting with a Tachyonic field with a relativistic Lagrangian $L_{TF}=-V(\varphi )\sqrt{1-{\partial }_i\varphi {\partial }^i\varphi }$. The acceleration of the Universe described by a scale factor $a(t)=t^n,(n>1)$. Under consideration of different forms of interaction the field $\varphi$ and the potential $V(\varphi )$ are recovered and graphical analysis performed. For illustration purposes we fixed values of parameters of the models to provide $V\to 0$ for later stages of evolution, when $t\to \infty$.

14 pages, 7 figures, typos corrected and references added. arXiv admin note: substantial text overlap with arXiv:1307.7859, and text overlap with arXiv:1210.0001 by other authors

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Cited by in corpus (2)

• Interacting varying Ghost Dark energy models in General Relativity
• A Dark Energy Model interacting with Dark Matter described by an effective EoS