论文标题
各向异性流体宇宙学中宇宙常数的出现
Emergence of a Cosmological Constant in Anisotropic Fluid Cosmology
论文作者
论文摘要
我们研究各向异性流体宇宙学，在这种情况下，以局部，时间依赖的方式进行不均匀性的方式进行了时空度量反应。我们将精确的解决方案得出了描述Friedmann-Lemaitre-Robertson-Walker（FLRW）在存在局部不均匀性和时间依赖性的背部反应的情况下的大规模宇宙学演化的精确解。我们使用派生来解决宇宙恒定的问题。通过在$ 100 \ \ text {mpc} $的空间尺度上平均后反应术语平均，我们的宇宙开始显得同质和各向同性。我们发现，“出现”的宇宙常数的数量级与天体物理观测一致，并且以一种自然的方式与男性物质密度相关。因此，在我们的框架中没有巧合的问题。
We investigate anisotropic fluid cosmology in a situation where the spacetime metric back-reacts in a local, time-dependent way to the presence of inhomogeneities. We derive exact solutions to the Einstein field equations describing Friedmann-Lemaitre-Robertson-Walker (FLRW) large scale cosmological evolution in the presence of local inhomogeneities and time-dependent back reaction. We use our derivation to tackle the cosmological constant problem. A cosmological constant emerges by averaging the back reaction term on spatial scales of the order of $100 \ \text{Mpc}$, at which our universe begins to appear homogeneous and isotropic. We find that the order of magnitude of the "emerged" cosmological constant agrees with astrophysical observations and is related in a natural way to baryonic matter density. Thus, there is no coincidence problem in our framework.
