Consistency condition for inflation from (broken) conformal symmetry
Consistency condition for inflation from (broken) conformal symmetry
复制标题
(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
期刊:
影响因子:
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通讯作者:
Ted van der Aalst
中科院分区:
文献类型:
--
作者:
K. Schalm;G. Shiu;Ted van der Aalst
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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