arXiv 2104.061072021-04-13astro-ph.COgr-qchep-th

从动力学时空宇宙学统一暗能量和暗物质

Unified Dark Energy and Dark Matter from Dynamical Spacetime Cosmology

David Benisty

备注：: PhD Thesis
DOI：: 10.1142/9789811258251_0037

摘要：

研究了基于动力学时空理论的统一暗物质和暗能量模型。通过引入动力学时空矢量场$χ_μ$，得到了能量动量张量$T^{μν}_{(χ)}$的守恒。该作用允许两种不同的电势，而一种代表暗能量。对于常数势，宇宙学解产生一个非奇异的反弹解，迅速接近$Λ$ CDM模型。动力学时间也对应于宇宙时间。该理论符合宇宙后期膨胀的数据。随着维数的增加，膨胀和紧化的机制出现了，某些维度呈指数增长，另一些维度呈指数收缩。通过要求动态时空矢量场是标量的梯度，DST成为一个具有扩散相互作用的理论，它渐近地返回到$Λ$ CDM模型作为一个稳定点。这些公式导致解决我们对宇宙起源的理解的情景。

英文摘要：

A model of unified dark matter and dark energy based on a Dynamical Spacetime Theory (DST) is studied. By introducing a Dynamical Spacetime vector field $χ_μ$, a conservation of an energy momentum tensor $T^{μν}_{(χ)}$ emerges. The action allows for two different potentials, while one represents a dark energy. For constant potentials, the cosmological solution yields a non singular bouncing solutions that rapidly approaches the $Λ$CDM model. The Dynamical Time corresponds to the cosmic time as well. The theory fits with the late time expansion data of the Universe. With higher dimensions a mechanism for inflation and compactification appears, with exponential growth for some dimensions and exponential contraction of the others. By demanding that the Dynamical Spacetime vector field be a gradient of a scalar the DST becomes a theory with diffusive interacting, which asymptotically returns to the $Λ$CDM model as a stable point. These formulations lead to scenarios which address our understanding about the origin of the Universe.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

相关论文