Statistical anisotropy of primordial gravitational waves from generalized $\delta N$ formalism

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As long as ( ρ A max / ρ ∗ ) Δ ψ (\rho_{A}^{\rm max}/\rho_{*})\Delta\psi is smaller than 1, we can still neglect the higher order terms with respect to ρ A / ρ \rho_{A}/\rho which are ignored e.g. in ( 5
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