Coupled phantom cosmological model motivated by the warm inflationary paradigm,Physical Review D

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Coupled phantom cosmological model motivated by the warm inflationary paradigm
Physical Review D ( IF 4.6 ) Pub Date : 2024-09-12 , DOI: 10.1103/physrevd.110.063529
Sudip Halder ₁ , Supriya Pan _{1,

2} , Paulo M. Sá _{3,

4} , Tapan Saha ₁

Affiliation

In this article, we investigate a coupled phantom dark-energy cosmological model in which the coupling term between a phantom scalar field with an exponential potential and a pressureless dark-matter fluid is motivated by the warm inflationary paradigm. Using methods of qualitative analysis of dynamical systems, complemented by numerical solutions of the evolution equations, we study the late-time behavior of our model. We show that contrary to the uncoupled scenario, the coupled phantom model admits accelerated scaling solutions. However, they do not correspond to a final state of the Universe’s evolution and, therefore, cannot be used to solve the cosmological coincidence problem. Furthermore, we show that, for certain coupling parameter values, the total equation-of-state parameter’s asymptotic behavior is significantly changed when compared to the uncoupled scenario, allowing for solutions less phantom even for steeper potentials of the phantom scalar field.

中文翻译：

由暖暴胀范式驱动的耦合幻影宇宙学模型

在本文中，我们研究了一个耦合的幻影暗能量宇宙学模型，其中具有指数势的幻影标量场和无压暗物质流体之间的耦合项是由暖膨胀范式驱动的。使用动力系统定性分析方法，并辅以演化方程的数值解，我们研究了模型的后期行为。我们表明，与非耦合场景相反，耦合幻影模型允许加速扩展解决方案。然而，它们并不对应于宇宙演化的最终状态，因此不能用于解决宇宙学巧合问题。此外，我们表明，对于某些耦合参数值，与非耦合场景相比，总状态方程参数的渐近行为发生了显着变化，即使对于幻影标量场的更陡峭的势，也允许解更少的幻影。

更新日期：2024-09-12

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