Built on

A. D. Linde, “A New Inflationary Universe Scenario: A Possible Solution of the Horizon, Flatness, Homogeneity, Isotropy and Primordial Monopole Problems,” Phys. Lett. B 108
1982
Earlier work this paper cites.
A. Albrecht and P. J. Steinhardt, “Cosmology for Grand Unified Theories with Radiatively Induced Symmetry Breaking,” Phys. Rev. Lett. 48
1982
Earlier work this paper cites.
A. A. Starobinsky, “Dynamics of Phase Transition in the New Inflationary Universe Scenario and Generation of Perturbations,” Phys. Lett. B 117
1982
Earlier work this paper cites.
D. Wands, K. A. Malik, D. H. Lyth and A. R. Liddle, “A New approach to the evolution of cosmological perturbations on large scales,” Phys. Rev. D 62
2000
Earlier work this paper cites.
J. M. Maldacena, “Non-Gaussian features of primordial fluctuations in single field inflationary models,” JHEP 0305
2003
Earlier work this paper cites.
N. C. Tsamis and R. P. Woodard, “Improved estimates of cosmological perturbations,” Phys. Rev. D 69
2004
Earlier work this paper cites.
P. Creminelli and M. Zaldarriaga, “Single field consistency relation for the 3-point function,” JCAP 0410
2004
Earlier work this paper cites.
W. H. Kinney, “Horizon crossing and inflation with large eta,” Phys. Rev. D 72
2005
Earlier work this paper cites.
D. H. Lyth, K. A. Malik and M. Sasaki, “A General proof of the conservation of the curvature perturbation,” JCAP 0505
2005
Earlier work this paper cites.

Similar

C. Quercellini, M. Bruni and A. Balbi, “Affine equation of state from quintessence and k-essence fields,” Class. Quant. Grav. 24
Original
2007
Cited alongside, same era.
A. J. Christopherson and K. A. Malik, “The non-adiabatic pressure in general scalar field systems,” Phys. Lett. B 675
Original
2009
Cited alongside, same era.
R. Akhoury, C. S. Gauthier and A. Vikman, “Stationary Configurations Imply Shift Symmetry: No Bondi Accretion for Quintessence / k-Essence,” JHEP 0903
Original
2009
Cited alongside, same era.
F. Arroja and M. Sasaki, “A note on the equivalence of a barotropic perfect fluid with a K-essence scalar field,” Phys. Rev. D 81
Original
2010
Cited alongside, same era.
S. Unnikrishnan and L. Sriramkumar, “A note on perfect scalar fields,” Phys. Rev. D 81

Then

J. Martin, H. Motohashi and T. Suyama, “Ultra Slow-Roll Inflation and the non-Gaussianity Consistency Relation,” Phys. Rev. D 87
Original
2013
Later among the works it cites.
A. Diez-Tejedor, “Note on scalars, perfect fluids, constrained field theories, and all that,” Phys. Lett. B 727
Original
2013
Later among the works it cites.
X. Chen, H. Firouzjahi, M. H. Namjoo and M. Sasaki, “Fluid Inflation,” JCAP 1309
Original
2013
Later among the works it cites.
X. Chen, H. Firouzjahi, E. Komatsu, M. H. Namjoo and M. Sasaki, “In-in and δ N \delta N calculations of the bispectrum from non-attractor single-field inflation,” JCAP 1312
Original
2013
Later among the works it cites.
I. Sawicki, I. D. Saltas, L. Amendola and M. Kunz, “Consistent perturbations in an imperfect fluid,” JCAP 1301

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2016

Global adiabaticity and non-Gaussianity consistency condition

Romano, Antonio Enea, Mooij, Sander, Sasaki, Misao

Understand

In the context of single-field inflation, the conservation of the curvature perturbation on comoving slices, $\R_c$, on super-horizon scales is one of the assumptions necessary to derive the consistency condition between the squeezed limit of the bispectrum and the spectrum of the primordial curvature perturbation.

However, the conservation of $\R_c$ holds only after the perturbation has reached the adiabatic limit where the constant mode of $\R_c$ dominates over the other (usually decaying) mode.
In this case, the non-adiabatic pressure perturbation defined in the thermodynamic sense, $\delta P_{nad}\equiv\delta P-c_w^2\delta\rho$ where $c_w^2=\dot P/\dot\rho$, usually becomes also negligible on superhorizon scales.
Therefore one might think that the adiabatic limit is the same as thermodynamic adiabaticity.

Built on

A. D. Linde, “A New Inflationary Universe Scenario: A Possible Solution of the Horizon, Flatness, Homogeneity, Isotropy and Primordial Monopole Problems,” Phys. Lett. B 108
1982
Earlier work this paper cites.
A. Albrecht and P. J. Steinhardt, “Cosmology for Grand Unified Theories with Radiatively Induced Symmetry Breaking,” Phys. Rev. Lett. 48
1982
Earlier work this paper cites.
A. A. Starobinsky, “Dynamics of Phase Transition in the New Inflationary Universe Scenario and Generation of Perturbations,” Phys. Lett. B 117
1982
Earlier work this paper cites.
D. Wands, K. A. Malik, D. H. Lyth and A. R. Liddle, “A New approach to the evolution of cosmological perturbations on large scales,” Phys. Rev. D 62
2000
Earlier work this paper cites.
J. M. Maldacena, “Non-Gaussian features of primordial fluctuations in single field inflationary models,” JHEP 0305
2003
Earlier work this paper cites.
N. C. Tsamis and R. P. Woodard, “Improved estimates of cosmological perturbations,” Phys. Rev. D 69
2004
Earlier work this paper cites.
P. Creminelli and M. Zaldarriaga, “Single field consistency relation for the 3-point function,” JCAP 0410
2004
Earlier work this paper cites.
W. H. Kinney, “Horizon crossing and inflation with large eta,” Phys. Rev. D 72
2005
Earlier work this paper cites.
D. H. Lyth, K. A. Malik and M. Sasaki, “A General proof of the conservation of the curvature perturbation,” JCAP 0505
2005
Earlier work this paper cites.