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arXiv 0705.3043hep-thastro-phgr-qc
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通向非定域宇宙学的道路

Route to nonlocal cosmology

Gianluca Calcagni, Michele Montobbio, Giuseppe Nardelli

摘要:

本文介绍了一种受立方弦场论启发的唯象模型的分析方法,并应用于一些例子。研究了一类能量密度包含无穷多个时间导数的最小耦合均匀标量场的作用量。这些非局部系统的系统本地化和算法来寻找宇宙学的动力学方程的解决方案。我们的形式主义是能够定义的非局部领域的区域的参数空间是无法访问的标准方法。同时,与非定域性相关的问题也在一个新的视角下被重新解释,并自然地被克服。我们考虑生活在一个Friedmann-Robertson-Walker背景的幂律标度因子的唯象模型,在四维和高能braneworld。对解决方案的探索揭示了非局部动力学的一般特征,指出了未来的几个研究方向。

英文摘要:

An analytic approach to phenomenological models inspired by cubic string field theory is introduced and applied to some examples. We study a class of actions for a minimally coupled, homogeneous scalar field whose energy density contains infinitely many time derivatives. These nonlocal systems are systematically localized and an algorithm to find cosmological solutions of the dynamical equations is provided. Our formalism is able to define the nonlocal field in regions of the parameter space which are inaccessible by standard methods. Also, problems related to nonlocality are reinterpreted under a novel perspective and naturally overcome. We consider phenomenological models living on a Friedmann-Robertson-Walker background with power-law scale factor, both in four dimensions and on a high-energy braneworld. The quest for solutions unravels general features of nonlocal dynamics indicating several future directions of investigation.

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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