论文标题
通过Energy-Momentum平方重力筛选各向异性：$λ$ CDM型号带隐藏的各向异性
Screening anisotropy via energy-momentum squared gravity: $Λ$CDM model with hidden anisotropy
论文作者
论文摘要
我们构建了标准$λ$ CDM模型的概括，其中我们同时替换了空间平坦的罗伯逊 - 步行者指标，其最简单的各向异性概括（lrs bianchi i Metric），并将冷暗物质与能量摩托仪（EMSG）相结合，将其与重力息息相关。 $ f（t_ {μν} t^{μν}）\ propto t_ {μν} t^{μν} $。这两种修改 - 即，两个新的僵硬的流体样本不同的术语可以相互取消，即可以完全筛选剪切标量，并在数学上与标准$λ$ CDM模型的弗里德曼方程相同。这逃避了对各向异性的BBN限制，从而提供了一个机会，以所需的量操纵宇宙微波背景四极温度波动。我们进一步讨论了模型对宇宙的早期和遥远的未来的后果。这项研究还提供了一个例子。表格$ f（t_ {μν} t^{μν}）\ propto t_ {μν} t^{μν} $以及类似类型的其他结构以及与当前的宇宙相关，甚至不一定是相关的宇宙，但与当前的宇宙相关，甚至不一定是相关的，但与当前的宇宙相关，甚至不一定是相关的， $ H_0 $问题。
We construct a generalization of the standard $Λ$CDM model, wherein we simultaneously replace the spatially flat Robertson-Walker metric with its simplest anisotropic generalization (LRS Bianchi I metric), and couple the cold dark matter to the gravity in accordance with the energy-momentum squared gravity (EMSG) of the form $f(T_{μν}T^{μν})\propto T_{μν}T^{μν}$. These two modifications -- namely, two new stiff fluid-like terms of different nature -- can mutually cancel out, i.e., the shear scalar can be screened completely, and reproduce mathematically exactly the same Friedmann equation of the standard $Λ$CDM model. This evades the BBN limits on the anisotropy, and thereby provides an opportunity to manipulate the cosmic microwave background quadrupole temperature fluctuation at the desired amount. We further discuss the consequences of the model on the very early times and far future of the Universe. This study presents also an example of that the EMSG of the form $f(T_{μν}T^{μν})\propto T_{μν}T^{μν}$, as well as similar type other constructions, is not necessarily relevant only to very early Universe but may even be considered in the context of a major problem of the current cosmology related to the present-day Universe, the so-called $H_0$ problem.
