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The $\delta N$ formalism is a powerful approach to compute non-linearly the large-scale evolution of the comoving curvature perturbation $\zeta$.
About singularities of cosmological solutions of the gravitational equations. I
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Hideo Kodama and Misao Sasaki · 1984
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Misao Sasaki · 1986
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Misao Sasaki and Ewan D. Stewart · 1996
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David Wands, Karim A. Malik, David H. Lyth, and Andrew R. Liddle · 2000
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Samuel M Leach, Misao Sasaki, David Wands, and Andrew R Liddle · 2001
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Eiichiro Komatsu and David N. Spergel · 2001
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David H. Lyth and David Wands · 2003
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Non-Gaussian features of primordial fluctuations in single field inflationary models
Juan Martin Maldacena · 2003
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David H. Lyth, Karim A. Malik, and Misao Sasaki · 2005
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In-in and δ N \delta N calculations of the bispectrum from non-attractor single-field inflation
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Atsushi Naruko, Yu-ichi Takamizu, and Misao Sasaki · 2013
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Ali Akbar Abolhasani, Razieh Emami, Javad T. Firouzjaee, and Hassan Firouzjahi · 2013
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Xingang Chen, Hassan Firouzjahi, Mohammad Hossein Namjoo, and Misao Sasaki · 2013
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Curvaton in large field inflation
Tomohiro Fujita, Masahiro Kawasaki, and Shuichiro Yokoyama · 2014
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Non-perturbative approach for curvature perturbations in stochastic δ N \delta N formalism
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Tomohiro Fujita, Masahiro Kawasaki, and Yuichiro Tada · 2014
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Vincent Vennin and Alexei A. Starobinsky · 2015
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