标题： 宇宙演化的历史与修正的Gauss-Bonnet-稀疏耦合项 显示英文标题

标题： History of cosmic evolution with modified Gauss-Bonnet-dilatonic coupled term

摘要： 四维Gauss-Bonnet-稀释子耦合在解释晚期宇宙演化中起着重要作用。 然而，这一项是低能弦有效作用的产物，因此在早期宇宙中也应该很重要。 不幸的是，由于分支问题，这种理论的相空间表述在文献中并不存在。 因此，我们考虑一种修改的引力理论，该理论除了具有Gauss-Bonnet-稀释子耦合的高阶标量曲率不变项外，还包含一个非最小耦合的标量-张量部分。 这样的作用量统一了早期膨胀和晚期宇宙加速。 该理论的量子版本也表现良好。 显示英文摘要

摘要： Gauss-Bonnet-dilatonic coupling in four dimension plays an important role to explain late time cosmic evolution. However, this term is an outcome of low energy string effective action and thus ought to be important in the early universe too. Unfortunately, phase-space formulation of such a theory does not exist in the literature due to branching. We therefore consider a modified theory of gravity, which contains a nonminimally coupled scalar-tensor sector in addition to higher order scalar curvature invariant term with Gauss-Bonnet-dilatonic coupling. Such an action unifies early inflation with late-time cosmic acceleration. Quantum version of the theory is also well-behaved.