The latest released data from Planck in 2018 put up tighter constraints on inflationary parameters. In the present article, the in-built symmetry of the non-minimally coupled scalar-tensor theory of gravity is used to fix the coupling parameter, the functional Brans–Dicke parameter, and the potential of the theory. It is found that all the three different power-law potentials and one exponential pass these constraints comfortably, and also gracefully exit from inflation.

中文翻译：

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用引力的标量张量理论膨胀

普朗克 2018 年最新发布的数据对通胀参数提出了更严格的限制。在本文中，非最小耦合标量张量引力理论的内置对称性用于固定耦合参数、泛函 Brans-Dicke 参数和理论的潜力。发现所有三个不同的幂律势和一个指数都可以轻松地通过这些约束，并且也可以优雅地退出通货膨胀。