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arXiv 1104.5366hep-thgr-qchep-ph
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量子引力中的轻费米子

Light fermions in quantum gravity

Astrid Eichhorn, Holger Gies

摘要:

我们研究了作为度规的量子场论的量子引力对费米子物质扇区中的手征对称性的影响。我们具体解决的问题,是否度量波动可以诱导手征对称性破缺和束缚态的形成。我们基于泛函重整化群的结果表明,即使在强引力耦合下,手征对称性仍然保持不变。特别是,我们发现,渐近安全的量子引力的引力耦合接近一个非高斯不动点一般承认宇宙轻费米子。因此,我们的结果进一步支持量子引力理论建立在波动的度量场,如渐近安全的情况。通过引力量子效应对手征对称性破缺的研究也可以作为其他量子引力方案的重要基准测试,因为在普朗克尺度下完全破缺的手征对称性与我们宇宙中光费米子的观测结果不一致。我们证明,这种基本的观察已经施加了约束的通用紫外线完成重力。

英文摘要:

We study the impact of quantum gravity, formulated as a quantum field theory of the metric, on chiral symmetry in a fermionic matter sector. We specifically address the question as to whether metric fluctuations can induce chiral symmetry breaking and bound state formation. Our results based on the functional Renormalization Group indicate that chiral symmetry is left intact even at strong gravitational coupling. In particular, we find that asymptotically safe quantum gravity where the gravitational couplings approach a non-Gaussian fixed point generically admits universes with light fermions. Our results thus further support quantum gravity theories built on fluctuations of the metric field such as the asymptotic-safety scenario. A study of chiral symmetry breaking through gravitational quantum effects may serve as a significant benchmark test also for other quantum gravity scenarios, since a completely broken chiral symmetry at the Planck scale would not be in accordance with the observation of light fermions in our universe. We demonstrate that this elementary observation already imposes constraints on a generic UV completion of gravity.

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