We study cosmological models involving a single real scalar field that has an equation of state parameter which evolves with cosmic time. We highlight some common parametrizations for the equation of state as a function of redshift in the context of twinlike theories. The procedure is used to introduce different models that have the same acceleration parameter, with the very same energy densities and pressure in flat spacetime.

中文翻译：

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用于参数化暗能量的Twinlike模型

我们研究涉及单个实标量场的宇宙学模型，该实数标量场具有随宇宙时间演化的状态参数方程。在双胞胎理论的背景下，我们着重指出了作为红移函数的状态方程的一些常见参数化。该程序用于介绍在平坦时空中具有相同加速参数，具有相同能量密度和压力的不同模型。