Possibly, the most general action in the background of isotropic and homogeneous space-time has been considered to study the quantum evolution of the early universe. 'Hermiticity' of the effective Hamiltonian operator in the presence of curvature squared terms suggests unitary time evolution of the quantum states, assuring the conservation of probability. Oscillatory behaviour of the semi-classical wavefunction signals that the theory is classically allowed. Despite the presence of several coupling parameters, only one additional slow-roll condition is required to impose in order to study the inflation. Inflationary parameters lie well within the presently available Planck's data. Since the Gauss-Bonnet-dilatonic coupled term does not play any roll in the inflationary regime, it appears to play a significant roll in the late stage of cosmic evolution.

中文翻译：

---

用广义行动探索早期宇宙

可能，在各向同性和均匀时空背景下最普遍的作用被认为是研究早期宇宙的量子演化。在存在曲率平方项的情况下，有效哈密顿算符的“厄密性”表明量子态的幺正时间演化，确保概率守恒。该理论在经典上允许的半经典波函数信号的振荡行为。尽管存在几个耦合参数，但为了研究膨胀只需要施加一个额外的慢滚条件。通货膨胀参数很好地包含在目前可用的普朗克数据中。由于 Gauss-Bonnet-dilatonic 耦合项在通货膨胀制度中不起作用，