Conformal/Poincaré Coset, cosmology, and descendants of Lovelock terms

Conformal/Poincaré Coset, cosmology, and descendants of Lovelock terms
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共形/庞加莱陪集、宇宙学和洛夫洛克项的后代

DOI:
10.1103/physrevd.102.024054
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发表时间:
2020
期刊:
影响因子:
5
通讯作者:
Tukhashvili, Giorgi
Tukhashvili, Giorgi
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Gabadadze, Gregory;Tukhashvili, Giorgi

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我们计算了六个不变项的引力场理论,非线性实现共形/庞加莱商,并减少到已知的共形伽利略在极限时,只有保形模式。六项中的五项是正则陪集项,而第六项是Wess-Zumino(WZ)项,它给出了迹线异常的著名引力作用。所获得的条款可以嵌入到量子有效场论(EFT)中,而不会破坏它们的关键特征,尽管需要进行某些微调。在EFT中出现的额外的质量模会很麻烦,然而,对于亚普朗克曲率,它们的质量是(超)普朗克的,因此相应的状态在EFT范围之外。我们讨论了这个理论的某些新的宇宙学解及其在EFT中的有效性。此外,我们表明,所获得的4D条款,除了WZ项,也可以来自高维Lovelock条款减少后者真正的四维条款根据一个定义良好的算法。
We calculate six invariant terms of a gravitational field theory that nonlinearly realizes the conformal/Poincaré quotient and reduce to the known conformal Galileons in the limit when only the conformal mode is kept. Five of the six terms are regular coset terms, while the sixth is a Wess-Zumino (WZ) term that gives the well-known gravitational action for the trace anomaly. The obtained terms can be embedded in a quantum effective field theory (EFT) without spoiling their key features, although at a cost of certain fine-tunings. The additional massive modes that appear in the EFT would have been troublesome, however, for sub-Planckian curvatures their masses are (super)-Planckian, and therefore the respective states are outside of the EFT regime. We discuss certain novel cosmological solution of this theory and their validity within the EFT. Furthermore, we show that the obtained 4D terms, except the WZ term, can also be derived from higher dimensional Lovelock terms by reducing the latter to the genuinely four-dimensional terms according to a well-defined algorithm.
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发表时间: 1974
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