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arXiv 2212.02547gr-qcastro-ph.CO
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动力学引力编织理论中的幻影吸引子:一种动力学系统方法

Phantom attractors in Kinetic Gravity Braiding theories: a dynamical system approach

Teodor Borislavov Vasilev, Mariam Bouhmadi-López, Prado Martín-Moruno

AI总结:

本研究采用动力学系统方法重新分析动力学引力编织标量场理论的宇宙膨胀历史,发现平移对称的该类模型除自调节德西特态外,还可能出现对应大撕裂奇点的未来宇宙学奇点,并给出了相关显式例子。

摘要:

我们重新研究了被称为Kinetic Gravity Braiding(动力学引力编织)的标量场理论的膨胀历史。这些理论因以下特性而闻名:当对应的拉格朗日量在标量场的常数平移下具有不变性时,有可能推动宇宙膨胀走向未来的自调节de Sitter(德西特)态。然而,这并非这些平移对称模型唯一可能的未来结局。通过动力学系统公式化表述,我们证明该框架中也可能出现未来宇宙学奇点。此外,我们还给出了若干显式例子,其中理论构型空间中的未来吸引子对应大撕裂奇点。

英文摘要:

We revise the expansion history of the scalar field theories known as Kinetic Gravity Braiding. These theories are well-known for the possibility of driving the expansion of the cosmos towards a future self-tuning de Sitter state when the corresponding Lagrangian is invariant under constant shifts in the scalar field. Nevertheless, this is not the only possible future fate of these shift-symmetric models. Using a dynamical system formulation we show that future cosmological singularities can also appear in this framework. Moreover, we present explicit examples where the future attractor in the configuration space of the theory corresponds to a big rip singularity.

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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