Primordial black hole formation and hybrid inflation
Lyth, David H.
Original · EN
We calculate the contribution to the curvature perturbation, that is generated while the waterfall field grows exponentially (which can occur only if the waterfall field mass is m≫ H). We consider the upper bound on its spectrum coming from constraints on the abundance of primordial black holes, taking account of possible non-gaussianity. The constraint is satisfied, but extrapolation of our result to the regime m H suggests that the constraint might not be satisfied there.
English translation
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