标题： 宇宙的起源：来自爱丁顿启发的博恩-英菲尔德引力的提示 显示英文标题

标题： Origin of the universe: A hint from Eddington-inspired Born-Infeld gravity

摘要： 我们研究了在爱丁顿启发的玻恩-朗道引力中充满标量场的各向异性宇宙的“初始状态”，其势能有各种形式。为此，研究了空间平坦、均匀的各向异性卡斯纳宇宙的演化。通过施加最大压力条件，我们为每个标量势找到了宇宙的精确演化。该解被证明描述了宇宙的初始状态。如果标量势在大场值时增加不超过二次幂，则该状态是正则的。我们还表明，各向异性在早期宇宙中不会引起任何缺陷，这与广义相对论的情况相反。 显示英文摘要

摘要： We study the `initial state' of an anisotropic universe in Eddington-inspired Born-Infeld gravity filled with a scalar field, whose potential has various forms. With this purpose, the evolution of a spatially-flat, homogeneous anisotropic Kasner universe is studied. We find an exact evolution of universe for each scalar potential by imposing a maximal pressure condition. The solution is shown to describe the initial state of the universe. The state is regular if the scalar potential increases not faster than the quadratic power for large field values. We also show that the anisotropy does not raise any defect in early universe contrary to the case of general relativity.