Breaking discrete symmetries in the effective field theory of inflation
Breaking discrete symmetries in the effective field theory of inflation
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DOI：
10.1088/1475-7516/2015/08/003
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发表时间：
2015-05
影响因子：
6.4
通讯作者：
Dario Cannone;Jinn-Ouk Gong;G. Tasinato
中科院分区：
文献类型：
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作者：
Dario Cannone;Jinn-Ouk Gong;G. Tasinato
我们研究了在暴胀时期的离散对称性破缺的现象，使用一个模型独立的方法的基础上的有效场理论的通货膨胀。我们的工作在一个上下文中，时间重新参数化对称性和空间同态不变性可以打破通货膨胀。我们确定了领先的导数算子在二次行动的波动，打破平价和时间反演。在适当的近似，我们研究其后果的动态线性波动。无论是在标量和张量部门，我们表明，这样的运营商可以导致新的方向相关的阶段所涉及的模式。它们不影响功率谱，但可能对更高的相关函数产生影响。此外，可以产生对声速的小的四极子贡献。
We study the phenomenon of discrete symmetry breaking during the inflationary epoch, using a model-independent approach based on the effective field theory of inflation. We work in a context where both time reparameterization symmetry and spatial diffeomorphism invariance can be broken during inflation. We determine the leading derivative operators in the quadratic action for fluctuations that break parity and time-reversal. Within suitable approximations, we study their consequences for the dynamics of linearized fluctuations. Both in the scalar and tensor sectors, we show that such operators can lead to new direction-dependent phases for the modes involved. They do not affect the power spectra, but can have consequences for higher correlation functions. Moreover, a small quadrupole contribution to the sound speed can be generated.