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arXiv 1808.09348gr-qchep-phhep-th
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从联系和标量场导出引力

Inducing Gravity From Connections and Scalar Fields

Hemza Azri

摘要:

我们提出了一种方法来诱导引力,或萨哈罗夫的“度量弹性”,它只需要一个仿射时空,容纳标量场。该设置提供了从“纯仿射”作用量中归纳度量引力,并且它以两种可能的方式建立:(i)在经典水平上,爱因斯坦-希尔伯特作用量同时具有度规和牛顿常数,来自背景场的非零势能(ii)在量子水平上(量子化物质),重力标度是通过对标量自由度积分而从单圈有效作用量导出的。在前者中,宇宙学常数被吸收导致引力扇区,然而,事实仍然是量子校正诱导大的宇宙学常数。这种新方法为诱导引力增加了一个重要特征,即度规结构不是从头开始强加的,而是原始理论的结果。

英文摘要:

We propose an approach to induced gravity, or Sakharov's "metrical elasticity", which requires only an affine spacetime that accommodates scalar fields. The setup provides the induction of metric gravity from a "pure affine" action, and it is established in two possible ways: (i) at the classical level, Einstein-Hilbert action arises with both, metric and Newton's constant, from the nonzero potential energy of the background field (ii) at the quantum level (quantized matter), gravity scale is induced from the one-loop effective action by integrating out the scalar degrees of freedom. In the former, the cosmological constant is absorbed leading to the gravitational sector, however, the fact remains that quantum corrections induce a large cosmological constant. This new approach adds a crucial feature to induced gravity which is the fact that the metric structure is not imposed from the scratch, but it is an outcome of the primary theory.

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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