Consistency condition for inflation from (broken) conformal symmetry

Consistency condition for inflation from (broken) conformal symmetry
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(破缺)共形对称性膨胀的一致性条件

DOI:
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发表时间:
2012
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通讯作者:
Ted van der Aalst
Ted van der Aalst
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作者:
K. Schalm;G. Shiu;Ted van der Aalst

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研究了慢滚膨胀中原始密度涨落的三点相关函数双谱的对称性约束。由慢滚膨胀的定义性质可知,原始相关函数的大部分结构继承自弱破缺德西特对称。利用借鉴AdS/CFT对应的全息技术,可以将双谱上的对称约束映射到弱破缺2+1维欧几里德CFT中的一组应力张量Ward恒等式。利用共形摄动理论构造了这些Ward恒等式的一致性条件。这需要二阶Ward恒等式和演化方程的使用。我们的结果也说明了保形微扰理论和慢滚胀之间的细微差别。
We investigate the symmetry constraints on the bispectrum, i.e. the three-point correlation function of primordial density fluctuations, in slow-roll inflation. It follows from the defining property of slow-roll inflation that primordial correlation functions inherit most of their structure from weakly broken de Sitter symmetries. Using holographic techniques borrowed from the AdS/CFT correspondence, the symmetry constraints on the bispectrum can be mapped to a set of stress-tensor Ward identities in a weakly broken 2+1-dimensional Euclidean CFT. We construct the consistency condition from these Ward identities using conformal perturbation theory. This requires a second order Ward identity and the use of the evolution equation. Our result also illustrates a subtle difference between conformal perturbation theory and the slow roll expansion.
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