论文标题
通过量表奖励相互作用引起的宇宙学各向异性
Induced cosmological anisotropy by a gauge-gravity interaction
论文作者
论文摘要
我们提出了一个简单的模型，该模型在标准FLRW几何形状之上生成宇宙学各向异性。从某种意义上说，这让人联想到平均场近似，其中所考虑的平均场宇宙学模型将是标准的FLRW，并且各向异性是其顶部的小扰动校正。使用超级启发的模型，我们确认模型的稳定固定点对应于标准的FLRW宇宙学。我们使用Bianchi VII $ _0 $ -Type型号，并补充了标量和$ u（1）$仪表字段，并且我们表明几何学的各向异性是由重力部门与$ U（1）$量表部门之间的非平凡相互作用产生的。在研究吸引子流量时，我们表明各向异性存在于早期（高红移）和渐近衰减与FLRW吸引子固定点。有了这样的机制，非各向异性的观察与FLRW几何形状或$λ$ CDM模型并不矛盾。这样的模型原则上可以对当前的宇宙学紧张局势进行一些见解。
We present a simple model which generates cosmological anisotropies on top of standard FLRW geometry. This is in some sense reminiscent of the mean field approximation, where the mean field cosmological model under consideration would be the standard FLRW, and the anisotropy is a small perturbative correction on top of it. Using a supergravity-inspired model, we confirm that the stable fixed point of our model corresponds to standard FLRW cosmology. We use a Bianchi VII$_0$-type model supplemented with a scalar and $U(1)$ gauge fields, and we show that the anisotropies of the geometry are generated by the non-trivial interaction between the gravity sector and the $U(1)$ gauge sector. Studying the attractor flow, we show that the anisotropies are present at early times (high redshift) and decay asymptotically to an FLRW attractor fixed point. With such a mechanism, observations of non-isotropy are not contradictory to FLRW geometry or indeed the $Λ$CDM model. Such models could in principle shed some insights on the present cosmological tensions.
