Built on

A. A. Starobinsky and J. Yokoyama, Equilibrium state of a selfinteracting scalar field in the De Sitter background
1994
Earlier work this paper cites.
A. D. Linde and V. F. Mukhanov, Nongaussian isocurvature perturbations from inflation
1997
Earlier work this paper cites.
T. Moroi and T. Takahashi, Effects of cosmological moduli fields on cosmic microwave background
2001
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D. H. Lyth and D. Wands, Generating the curvature perturbation without an inflaton
2002
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K. Enqvist and M. S. Sloth, Adiabatic CMB perturbations in pre - big bang string cosmology
2002
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J. M. Maldacena, Non-Gaussian features of primordial fluctuations in single field inflationary models
2003
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G. Dvali, A. Gruzinov, and M. Zaldarriaga, A new mechanism for generating density perturbations from inflation
2004
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M. Zaldarriaga, Non-Gaussianities in models with a varying inflaton decay rate
2004
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P. Creminelli and M. Zaldarriaga, Single field consistency relation for the 3-point function
2004
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S. Weinberg, Quantum contributions to cosmological correlations
2005
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N. Dalal, O. Dore, D. Huterer, and A. Shirokov, The imprints of primordial non-gaussianities on large-scale structure: scale dependent bias and abundance of virialized objects
Original
2008
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X. Chen and Y. Wang, Quasi-Single Field Inflation and Non-Gaussianities
Original
2010
Earlier work this paper cites.

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Then

J. Bramante, J. Kumar, E. Nelson, and S. Shandera, Cosmic variance of the spectral index from mode coupling
Original
2013
Later among the works it cites.
M. LoVerde, Super cosmic variance from mode-coupling: A worked example
Original
2014
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M. Thorsrud, D. F. Mota, and F. R. Urban, Local Observables in a Landscape of Infrared Gauge Modes
Original
2014
Later among the works it cites.
M. Thorsrud, F. R. Urban, and D. F. Mota, Statistics of Anisotropies in Inflation with Spectator Vector Fields
Original
2014
Later among the works it cites.
K. Hinterbichler, L. Hui, and J. Khoury, An Infinite Set of Ward Identities for Adiabatic Modes in Cosmology

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2015

Cosmic variance in inflation with two light scalars

Bonga, Béatrice, Brahma, Suddhasattwa, Deutsch, Anne-Sylvie et al.

Understand

We examine the squeezed limit of the bispectrum when a light scalar with arbitrary non-derivative self-interactions is coupled to the inflaton.

We find that when the hidden sector scalar is sufficiently light ($m\lesssim0.1\,H$), the coupling between long and short wavelength modes from the series of higher order correlation functions (from arbitrary order contact diagrams) causes the statistics of the fluctuations to vary in sub-volumes.
This means that observations of primordial non-Gaussianity cannot be used to uniquely reconstruct the potential of the hidden field.
However, the local bispectrum induced by mode-coupling from these diagrams always has the same squeezed limit, so the field's locally determined mass is not affected by this cosmic variance.

Built on

A. A. Starobinsky and J. Yokoyama, Equilibrium state of a selfinteracting scalar field in the De Sitter background
1994
Earlier work this paper cites.
A. D. Linde and V. F. Mukhanov, Nongaussian isocurvature perturbations from inflation
1997
Earlier work this paper cites.
T. Moroi and T. Takahashi, Effects of cosmological moduli fields on cosmic microwave background
2001
Earlier work this paper cites.
D. H. Lyth and D. Wands, Generating the curvature perturbation without an inflaton
2002
Earlier work this paper cites.
K. Enqvist and M. S. Sloth, Adiabatic CMB perturbations in pre - big bang string cosmology
2002
Earlier work this paper cites.
J. M. Maldacena, Non-Gaussian features of primordial fluctuations in single field inflationary models
2003
Earlier work this paper cites.
G. Dvali, A. Gruzinov, and M. Zaldarriaga, A new mechanism for generating density perturbations from inflation
2004
Earlier work this paper cites.
M. Zaldarriaga, Non-Gaussianities in models with a varying inflaton decay rate
2004
Earlier work this paper cites.
P. Creminelli and M. Zaldarriaga, Single field consistency relation for the 3-point function
2004
Earlier work this paper cites.
S. Weinberg, Quantum contributions to cosmological correlations
2005
Earlier work this paper cites.
N. Dalal, O. Dore, D. Huterer, and A. Shirokov, The imprints of primordial non-gaussianities on large-scale structure: scale dependent bias and abundance of virialized objects
Original
2008
Earlier work this paper cites.
X. Chen and Y. Wang, Quasi-Single Field Inflation and Non-Gaussianities
Original
2010
Earlier work this paper cites.