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arXiv 1503.06994gr-qcastro-ph.COmath.DS
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单项标量场势和理想流体的整体动力学和渐近性

Global dynamics and asymptotics for monomial scalar field potentials and perfect fluids

Artur Alho, Juliette Hell, Claes Uggla

摘要:

本文考虑平坦FLRW宇宙学中具有单项式势和理想流体的最小耦合标量场。我们将局部和全局动力系统技术应用于一个新的三维动力系统,在一个紧凑的状态空间上重新表述场方程。这导致了一个直观的全局描述的解决方案空间和渐近行为。在晚些时候,我们采用平均技术来证明报表之间的关系的状态方程的流体和标量场的单项指数的影响渐近源的优势和渐近显自相似性打破。我们还讨论了三维状态空间中的“吸引子”解,并表明它对应于一维不稳定中心流形的de Sitter不动点,位于与早期动态相关的非物理边界上。通过导出中心流形展开式,我们得到了吸引子解的近似表达式。随后,我们通过Padé逼近提高了近似的精度和范围,并与慢滚近似进行了比较。

英文摘要:

We consider a minimally coupled scalar field with a monomial potential and a perfect fluid in flat FLRW cosmology. We apply local and global dynamical systems techniques to a new three-dimensional dynamical systems reformulation of the field equations on a compact state space. This leads to a visual global description of the solution space and asymptotic behavior. At late times we employ averaging techniques to prove statements about how the relationship between the equation of state of the fluid and the monomial exponent of the scalar field affects asymptotic source dominance and asymptotic manifest self-similarity breaking. We also situate the `attractor' solution in the three-dimensional state space and show that it corresponds to the one-dimensional unstable center manifold of a de Sitter fixed point, located on an unphysical boundary associated with the dynamics at early times. By deriving a center manifold expansion we obtain approximate expressions for the attractor solution. We subsequently improve the accuracy and range of the approximation by means of Padé approximants and compare with the slow-roll approximation.

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。

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