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J. M. Maldacena, “Non-Gaussian features of primordial fluctuations in single field inflationary models,” JHEP 0305
2003
Earlier work this paper cites.
J. S. Schwinger, “Brownian motion of a quantum oscillator,” J. Math. Phys. 2
2005
Earlier work this paper cites.

Similar

N. Agarwal, R. Holman, A. J. Tolley and J. Lin, “Effective field theory and non-Gaussianity from general inflationary states,” JHEP 1305
Original
2013
Cited alongside, same era.
H. Collins, “Primordial non-Gaussianities from inflation,” arXiv:1101.1308 [astro-ph.CO]
Original
Cited in the paper.

Then

H. Collins, “Initial state propagators,” JHEP 1311
Original
2013
Later among the works it cites.

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2014

Renormalizing an initial state

Collins, Hael, Holman, R., Vardanyan, Tereza

Understand

The intricate machinery of perturbative quantum field theory has largely been devoted to the 'dynamical' side of the theory: simple states are evolved in complicated ways.

This article begins to address this lopsided treatment.
Although it is rarely possible to solve for the eigenstates of an interacting theory exactly, a general state and its evolution can nonetheless be constructed perturbatively in terms of the propagators and structures defined with respect to the free theory.
The detailed form of the initial state in this picture is fixed by imposing suitable `renormalization conditions' on the Green's functions.