Built on

A. Bzowski, P. McFadden, and K. Skenderis, “Holographic predictions for cosmological 3-point functions,” JHEP
Original
1967
Earlier work this paper cites.
B. S. DeWitt, “Quantum Theory of Gravity. 1. The Canonical Theory,” Phys. Rev
1967
Earlier work this paper cites.
A. A. Starobinsky, “A New Type of Isotropic Cosmological Models Without Singularity,” Phys. Lett
1980
Earlier work this paper cites.
J. B. Hartle and S. W. Hawking, “Wave Function of the Universe,” Phys. Rev
1983
Earlier work this paper cites.
M. Sasaki and E. D. Stewart, “A General analytic formula for the spectral index of the density perturbations produced during inflation,” Prog. Theor. Phys
Original
1996
Earlier work this paper cites.
D. H. Lyth, “What would we learn by detecting a gravitational wave signal in the cosmic microwave background anisotropy?,” Phys. Rev. Lett
1997
Earlier work this paper cites.
D. H. Lyth and A. Riotto, “Particle physics models of inflation and the cosmological density perturbation,” Phys. Rept
1999
Earlier work this paper cites.
J. M. Maldacena, “Non-Gaussian features of primordial fluctuations in single field inflationary models,” JHEP
2003
Earlier work this paper cites.
F. Larsen and R. McNees, “Inflation and de Sitter holography,” JHEP
2003
Earlier work this paper cites.
M. Zaldarriaga, “Non-Gaussianities in models with a varying inflaton decay rate,” Phys. Rev
2004
Earlier work this paper cites.
P. Creminelli and M. Zaldarriaga, “Single field consistency relation for the 3-point function,” JCAP
2004
Earlier work this paper cites.
D. Babich, P. Creminelli, and M. Zaldarriaga, “The Shape of non-Gaussianities,” JCAP
2004
Earlier work this paper cites.

Similar

S. Weinberg, “Quantum contributions to cosmological correlations,” Phys. Rev
2005
Cited alongside, same era.
X. Chen, M.-x. Huang, S. Kachru, and G. Shiu, “Observational signatures and non-Gaussianities of general single field inflation,” JCAP
2007
Cited alongside, same era.
D. Seery, K. A. Malik, and D. H. Lyth, “Non-gaussianity of inflationary field perturbations from the field equation,” JCAP
Original
2008
Cited alongside, same era.
F. Arroja and K. Koyama, “Non-gaussianity from the trispectrum in general single field inflation,” Phys. Rev
Original
2008
Cited alongside, same era.
C. Cheung, P. Creminelli, A. L. Fitzpatrick, J. Kaplan, and L. Senatore, “The Effective Field Theory of Inflation,” JHEP
Original
2008

Then

E. Pajer, F. Schmidt, and M. Zaldarriaga, “The Observed Squeezed Limit of Cosmological Three-Point Functions,” Phys. Rev
Original
2013
Later among the works it cites.
C. Coriano, L. Delle Rose, E. Mottola, and M. Serino, “Solving the Conformal Constraints for Scalar Operators in Momentum Space and the Evaluation of Feynman’s Master Integrals,” JHEP
Original
2013
Later among the works it cites.
R. Kallosh, A. Linde, and D. Roest, “Universal Attractor for Inflation at Strong Coupling,” Phys. Rev. Lett
Original
2014
Later among the works it cites.
A. Bzowski, P. McFadden, and K. Skenderis, “Implications of conformal invariance in momentum space,” JHEP
Original
2014
Later among the works it cites.
A. Ghosh, N. Kundu, S. Raju, and S. P. Trivedi, “Conformal Invariance and the Four Point Scalar Correlator in Slow-Roll Inflation,” JHEP

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2016

The Conformal Limit of Inflation in the Era of CMB Polarimetry

Pajer, Enrico, Pimentel, Guilherme L., Van Wijck, Jaap V. S.

Understand

We argue that the non-detection of primordial tensor modes has taught us a great deal about the primordial universe.

In single-field slow-roll inflation, the current upper bound on the tensor-to-scalar ratio, $r < 0.07$ $(95 \% ~CL)$, implies that the Hubble slow-roll parameters obey $\varepsilon \ll \eta$, and therefore establishes the existence of a new hierarchy.
We dub this regime the conformal limit of (slow-roll) inflation, and show that it includes Starobinsky-like inflation as well as all viable single-field models with a sub-Planckian field excursion.
In this limit, all primordial correlators are constrained by the full conformal group to leading non-trivial order in slow-roll.

Built on

A. Bzowski, P. McFadden, and K. Skenderis, “Holographic predictions for cosmological 3-point functions,” JHEP
Original
1967
Earlier work this paper cites.
B. S. DeWitt, “Quantum Theory of Gravity. 1. The Canonical Theory,” Phys. Rev
1967
Earlier work this paper cites.
A. A. Starobinsky, “A New Type of Isotropic Cosmological Models Without Singularity,” Phys. Lett
1980
Earlier work this paper cites.
J. B. Hartle and S. W. Hawking, “Wave Function of the Universe,” Phys. Rev
1983
Earlier work this paper cites.
M. Sasaki and E. D. Stewart, “A General analytic formula for the spectral index of the density perturbations produced during inflation,” Prog. Theor. Phys
Original
1996
Earlier work this paper cites.
D. H. Lyth, “What would we learn by detecting a gravitational wave signal in the cosmic microwave background anisotropy?,” Phys. Rev. Lett
1997
Earlier work this paper cites.
D. H. Lyth and A. Riotto, “Particle physics models of inflation and the cosmological density perturbation,” Phys. Rept
1999
Earlier work this paper cites.
J. M. Maldacena, “Non-Gaussian features of primordial fluctuations in single field inflationary models,” JHEP
2003
Earlier work this paper cites.
F. Larsen and R. McNees, “Inflation and de Sitter holography,” JHEP
2003
Earlier work this paper cites.
M. Zaldarriaga, “Non-Gaussianities in models with a varying inflaton decay rate,” Phys. Rev
2004
Earlier work this paper cites.
P. Creminelli and M. Zaldarriaga, “Single field consistency relation for the 3-point function,” JCAP
2004
Earlier work this paper cites.
D. Babich, P. Creminelli, and M. Zaldarriaga, “The Shape of non-Gaussianities,” JCAP
2004
Earlier work this paper cites.