论文标题
四阶重力弹跳宇宙学
Bouncing Cosmology in Fourth-Order Gravity
论文作者
论文摘要
大爆炸的初始奇异性问题可以通过弹跳解决方案来解决。在扩展的重力理论的背景下，我们将寻找协变量的有效动作，其场方程包含多达公制张量的四阶导数。在找到这种弹跳的解决方案时，我们将利用基于扰动方法的订单减少技术。将字段方程的顺序减少到二阶，我们能够找到接近一般相对性的解决方案。我们将建立由此产生的秩序减少理论的协变量行动。
The Big Bang initial singularity problem can be solved by means of bouncing solutions. In the context of extended theories of gravity, we will look for covariant effective actions whose field equations contain up to fourth-order derivatives of the metric tensor. In finding such bouncing solutions, we will make use of an order reduction technique based on a perturbative approach. Reducing the order of the field equations to second-order, we are able to find solutions which are perturbatively close to General Relativity. We will build the covariant effective actions of the resulting order reduced theories.
