论文标题
正规化大爆炸的另一个型号
Another model for the regularized big bang
论文作者
论文摘要
我们提出了一个带有Brans-Dicke型标量字段的重力模型，在可能的动作中，“错误的”动力学项和四分之一的相互作用项。在宇宙学的背景下，我们根据边界条件（弗里德曼溶液或扭结溶液）获得。扩展的弗里德曼解决方案具有大爆炸曲率的奇异性，而扭结式溶液具有宇宙量表因子的非弹跳行为。弹跳恰好发生在扭结型构型的标量场时的时刻发生零，从而导致有效的重力耦合消失。
We propose a gravitational model with a Brans-Dicke-type scalar field having, in the would-be action, a "wrong-sign" kinetic term and a quartic interaction term. In a cosmological context, we obtain, depending on the boundary conditions, either the Friedmann solution or a kink-bounce solution. The expanding-universe Friedmann solution has a big bang curvature singularity, whereas the kink-bounce solution has a nonsingular bouncing behavior of the cosmic scale factor. The bounce occurs precisely at the moment when the scalar field of the kink-type configuration goes through zero, making for a vanishing effective gravitational coupling.
