标题： 二次引力中的一种后暴胀效应：暗能量 显示英文标题

标题： Dark Energy as a Post-Inflation Effect in Quadratic Gravity

摘要： 我们解析地和数值地表明，宇宙加速膨胀可以通过一个二次引力模型来解释，该模型已知能够引发足够的暴胀，且无需负能压力物质或宇宙常数。 此外，我们精确地证明了此模型与爱因斯坦引力在辐射和物质主导时期存在显著差异，给出了非收缩的哈勃视界以及平滑的宇宙膨胀历史。 因此，这表明暗能量可能是二次引力中的暴胀后效应。 我们还证明了此模型的所有解都包含所有爱因斯坦度规。 由此，经典的爱因斯坦引力检验无法否定此模型。 显示英文摘要

摘要： We analytically and numerically show that the acceleration of the cosmic expansion could be explained by a Quadratic Gravity model which is known to be able to trigger sufficient inflation, with neither negative pressure matter nor cosmological constant. Furthermore, we exactly show that this model differs greatly from Einstein's gravity in radiation and matter dominant era, giving a non-shrinking Hubble horizon and a smooth expansion history of the universe. Accordingly, it suggests that the Dark Energy could possibly be a post-inflation effect in Quadratic Gravity. We also show that this model admits all Einstein metrics as its solutions. Consequently, classic tests of Einstein's Gravity cannot falsify this model.