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arXiv 1402.6450hep-thastro-ph.COgr-qchep-ph
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阿贝尔对称破缺引起的宇宙加速

Cosmic Acceleration from Abelian Symmetry Breaking

Gianmassimo Tasinato

摘要:

我们讨论了自相互作用矢量场的一致理论,以这种方式打破阿贝尔对称性以获得其纵向极化的有趣行为。在适当的解耦限制下,纵向模式的动力学由Galileon相互作用控制。远离去耦极限的完整理论不会传播鬼模,并且可以在非线性变得重要的情况下进行研究。当与引力耦合时,这个理论提供了一个暗能量的候选者,因为它承认德西特宇宙学解的特征是哈勃参数的技术上的自然值。我们还考虑了均匀演化时,除了矢量,在完美的流体形式的额外的物质。我们发现,矢量可以有一个重要的作用,在描述宇宙膨胀。

英文摘要:

We discuss a consistent theory for a self-interacting vector field, breaking an Abelian symmetry in such a way to obtain an interesting behavior for its longitudinal polarization. In an appropriate decoupling limit, the dynamics of the longitudinal mode is controlled by Galileon interactions. The full theory away from the decoupling limit does not propagate ghost modes, and can be investigated in regimes where non-linearities become important. When coupled to gravity, this theory provides a candidate for dark energy, since it admits de Sitter cosmological solutions characterized by a technically natural value for the Hubble parameter. We also consider the homogeneous evolution when, besides the vector, additional matter in the form of perfect fluids is included. We find that the vector can have an important role in characterizing the universe expansion.

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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