伽利略起源
Subluminal Galilean Genesis
摘要：
我们提出了一个改进版本的伽利略创世纪模型，解决了超光速的问题。我们降级的完整的共形群庞加莱对称加上膨胀，补充近似伽利略位移不变性在紫外线和小字段值。通过这种方式，违背NEC的宇宙学背景周围的波动基本上是亚光速的，与原始模型相比，任何微小的解的变化都不能达到超光速。膨胀不变性仍然保护着无质量测试标量的关联函数的标度不变性--这是观测到的宇宙学涨落的来源--但是在更高阶的标量中可以潜在地观测到共形群的显式破缺。我们还强调了一个微妙的匹配NEC违反阶段与标准的宇宙学演化，并讨论了可能的耦合伽利略引力。
英文摘要：
We put forward an improved version of the Galilean Genesis model that addresses the problem of superluminality. We demote the full conformal group to Poincare symmetry plus dilations, supplemented with approximate galilean shift invariance in the UV and at small field values. In this way fluctuations around the NEC-violating cosmological background are made substantially subluminal, and superluminality cannot be reached by any small change of the solution, in contrast with the original model. Dilation invariance still protects the scale-invariance of correlation functions of a massless test scalar - which is the source of the observed cosmological fluctuations - but the explicit breaking of the conformal group can be potentially observed in higher-order correlators. We also highlight a subtlety in matching the NEC-violating phase with the standard cosmological evolution, and discuss the possible couplings of the Galileon to gravity.
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