论文标题
$λ<0 $引力有效场理论加速宇宙学
Accelerating cosmology from $Λ<0$ gravitational effective field theory
论文作者
论文摘要
大型$λ<0 $宇宙学具有大爆炸 /大的紧缩空间，具有时间对称的背景和渐近广告欧几里得的连续性，表明可能具有全息图。我们认为这些模型通常具有时间依赖性标量字段，并且这些模型可以在均匀背景几何形状的层面上导致逼真的宇宙学，并在周转和紧缩之前具有加速阶段。我们首先通过显式有效的现场理论示例证明，具有渐近广告欧几里得延续的模型也可以表现出一段时期的加速扩张而无需进行微调。然后，我们证明某些明显的调整示例可以任意地给出接近$λ$ CDM模型的预测。最后，我们通过明确的结构证明，感兴趣的潜力可能是由超电势引起的，因此表明这些溶液可能与潜在的超对称理论兼容。
A large class of $Λ< 0$ cosmologies have big-bang / big crunch spacetimes with time-symmetric backgrounds and asymptotically AdS Euclidean continuations suggesting a possible holographic realization. We argue that these models generically have time-dependent scalar fields, and these can lead to realistic cosmologies at the level of the homogeneous background geometry, with an accelerating phase prior to the turnaround and crunch. We first demonstrate via explicit effective field theory examples that models with an asymptotically AdS Euclidean continuation can also exhibit a period of accelerated expansion without fine tuning. We then show that certain significantly more tuned examples can give predictions arbitrarily close to a $Λ$CDM model. Finally, we demonstrate via an explicit construction that the potentials of interest can arise from a superpotential, thus suggesting that these solutions may be compatible with an underlying supersymmetric theory.
