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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1802.01247gr-qcastro-ph.HEhep-phhep-th
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真的有适形框架吗?仿射膨胀的唯一性

Are there really conformal frames? Uniqueness of affine inflation

Hemza Azri

摘要:

在这里,我们简要地回顾了一个单一的标量场在纯仿射引力的背景下的非最小耦合动力学,并将研究扩展到多场动力学。耦合是通过仿射连接及其相关的曲率,而不涉及任何度量张量。后者是后验的,它可能获得像引力尺度一样的突现特征。在仿射引力中值得注意的是从非最小耦合到最小耦合的过渡,这仅仅是通过对标量场的场重新定义来实现的。因此,暴胀模型获得了独特的描述,在这种情况下,所观察到的参数,如标量倾斜和张量标量比,是不变的场重新参数化。总的来说,引力的仿射方法有望揭示宇宙学和天体粒子物理学中有趣而丰富的现象学。

英文摘要:

Here we concisely review the nonminimal coupling dynamics of a single scalar field in the context of purely affine gravity and extend the study to multifield dynamics. The coupling is performed via an affine connection and its associated curvature without referring to any metric tensor. The latter arises a posteriori and it may gain an emergent character like the scale of gravity. What is remarkable in affine gravity is the transition from nonminimal to minimal couplings which is realized by only field redefinition of the scalar fields. Consequently, the inflationary models gain a unique description in this context where the observed parameters, like the scalar tilt and the tensor-to-scalar ratio, are invariant under field reparametrization. Overall, gravity in its affine approach is expected to reveal interesting and rich phenomenology in cosmology and astroparticle physics.

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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