Robustness of inflation to inhomogeneous initial conditions
Robustness of inflation to inhomogeneous initial conditions
复制标题
DOI：
10.1088/1475-7516/2017/09/025
复制
发表时间：
2016-08
影响因子：
6.4
通讯作者：
K. Clough;Eugene A. Lim;Brandon S. DiNunno;W. Fischler;R. Flauger;S. Paban
中科院分区：
文献类型：
--
作者：
K. Clough;Eugene A. Lim;Brandon S. DiNunno;W. Fischler;R. Flauger;S. Paban
我们考虑了不同的暴胀模型中标量场轮廓和外曲率的非均匀初始条件的影响。特别是，我们比较小的字段膨胀的大字段膨胀的鲁棒性，使用3+1维爱因斯坦引力的数值模拟。我们发现，小场膨胀可以失败的次主导梯度能量的存在下，这表明它是不那么强大的不均匀性比大的字段膨胀，承受主导梯度能量。然而，我们也表明，小场膨胀可以成功，即使某些区域的时空开始在该地区的潜力，不支持通货膨胀。在大场的情况下，我们证实了以前的结果，即通货膨胀是强大的，如果暴胀子占据的潜在的通货膨胀的一部分。此外，我们表明，增加初始标量梯度不会形成足够大的质量的暴胀结束黑洞，如果初始超曲面是近似平坦的。最后，我们考虑具有变化的非本征曲率K的大场情况，使得某些区域最初是坍缩的。我们发现这可能再次导致局部黑洞，但如果时空是开放的，那么总体上时空仍然是暴胀的，这证实了以前的理论研究。
We consider the effects of inhomogeneous initial conditions in both the scalar field profile and the extrinsic curvature on different inflationary models. In particular, we compare the robustness of small field inflation to that of large field inflation, using numerical simulations with Einstein gravity in 3+1 dimensions. We find that small field inflation can fail in the presence of subdominant gradient energies, suggesting that it is much less robust to inhomogeneities than large field inflation, which withstands dominant gradient energies. However, we also show that small field inflation can be successful even if some regions of spacetime start out in the region of the potential that does not support inflation. In the large field case, we confirm previous results that inflation is robust if the inflaton occupies the inflationary part of the potential. Furthermore, we show that increasing initial scalar gradients will not form sufficiently massive inflation-ending black holes if the initial hypersurface is approximately flat. Finally, we consider the large field case with a varying extrinsic curvature K, such that some regions are initially collapsing. We find that this may again lead to local black holes, but overall the spacetime remains inflationary if the spacetime is open, which confirms previous theoretical studies.