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Similar

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Original
2012
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E. Sefusatti, J. R. Fergusson, X. Chen and E. P. S. Shellard, “Effects and Detectability of Quasi-Single Field Inflation in the Large-Scale Structure and Cosmic Microwave Background,” JCAP 1208
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2012
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2012
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Then

F. Schmidt, N. E. Chisari and C. Dvorkin, “Imprint of inflation on galaxy shape correlations,” JCAP 1510
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2015
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E. Dimastrogiovanni, M. Fasiello and M. Kamionkowski, “Imprints of Massive Primordial Fields on Large-Scale Structure,” JCAP 1602
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2017

On the Effective Field Theory for Quasi-Single Field Inflation

Tong, Xi, Wang, Yi, Zhou, Siyi

Understand

We study the effective field theory (EFT) description of the virtual particle effects in quasi-single field inflation, which unifies the previous results on large mass and large mixing cases.

By using a horizon crossing approximation and matching with known limits, approximate expressions for the power spectrum and the spectral index are obtained.
The error of the approximate solution is within 10% in dominate parts of the parameter space, which corresponds to less-than-0.1% error in the $n_s$-$r$ diagram.
The quasi-single field corrections on the $n_s$-$r$ diagram are plotted for a few inflation models.