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Similar

A. Achucarro, J. O. Gong, S. Hardeman, G. A. Palma and S. P. Patil, “Effective theories of single field inflation when heavy fields matter,” JHEP 1205
Original
2012
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V. Assassi, D. Baumann and D. Green, “On Soft Limits of Inflationary Correlation Functions,” JCAP 1211
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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J. Norena, L. Verde, G. Barenboim and C. Bosch, “Prospects for constraining the shape of non-Gaussianity with the scale-dependent bias,” JCAP 1208
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Cited alongside, same era.
X. Chen and Y. Wang, “Quasi-Single Field Inflation with Large Mass,” JCAP 1209

Then

A. Achúcarro, V. Atal and Y. Welling, “On the viability of m 2 ϕ 2 m^{2}\phi^{2} and natural inflation,” JCAP 1507
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2015
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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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X. Chen, M. H. Namjoo and Y. Wang, “Models of the Primordial Standard Clock,” JCAP 1502
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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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J. Maldacena, “A model with cosmological Bell inequalities,” Fortsch. Phys. 64

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2018

Warm Quasi-Single Field Inflation

Tong, Xi, Wang, Yi, Zhou, Siyi

Understand

We study quasi-single field inflation with a warm inflation background.

The thermal effects at small scales can sufficiently enhance the magnitude of the primordial standard clock signal.
This scenario offers us the possibility of probing the UV physics of the very early universe without the exponentially small Boltzmann factor when the mass of the isocurvaton is much heavier than Hubble.
The thermal effects at small scales can be studied using the flat space thermal field theory, connected to an effective description using non-Bunch-Davies vacuum at large scales, with large clock signal.