The ζ-ζ correlator is time dependent

E. O. Kahya; V. K. Onemli; R. P. Woodard

doi:10.1016/j.physletb.2010.09.050

The ζ-ζ correlator is time dependent

E. O. Kahya^*, V. K. Onemli, R. P. Woodard

^*Corresponding author for this work

Department of Physics Engineering

Research output: Contribution to journal › Article › peer-review

61 Citations (Scopus)

Abstract

We comment on the recent arguments by Senatore and Zaldarriaga that loop corrections to the ζ-ζ correlator cannot grow with time after first horizon crossing. We first emphasize the need to search for such secular dependence in corrections whose in-out matrix elements are infrared singular on an infinite spatial manifold. Then we give examples of such time dependence from pure quantum gravity and from scalar potential models. Finally, we point out that this time dependence arises from inflationary particle production and is therefore unlikely to endanger the preservation of super-horizon correlations as a record of inflation.

Original language	English
Pages (from-to)	101-107
Number of pages	7
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	694
Issue number	2
DOIs	https://doi.org/10.1016/j.physletb.2010.09.050
Publication status	Published - 1 Nov 2010

Funding

We are grateful for correspondence with S. Deser and S. Weinberg. This work was partially supported by Marie Curie Grant IRG-247803, by NSF grants PHY-0653085 and PHY-0855021 , and by the Institute for Fundamental Theory at the University of Florida .

Funders	Funder number
Institute for Fundamental Theory at the University of Florida
National Science Foundation	PHY-0855021, PHY-0653085
Directorate for Mathematical and Physical Sciences	0855021, 0653085
Marie Curie	IRG-247803

Keywords

Cosmology
Inflation
Infrared logarithms
Quantum gravity
Quantum loop effects

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10.1016/j.physletb.2010.09.050

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AU - Kahya, E. O.

AU - Onemli, V. K.

AU - Woodard, R. P.

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N2 - We comment on the recent arguments by Senatore and Zaldarriaga that loop corrections to the ζ-ζ correlator cannot grow with time after first horizon crossing. We first emphasize the need to search for such secular dependence in corrections whose in-out matrix elements are infrared singular on an infinite spatial manifold. Then we give examples of such time dependence from pure quantum gravity and from scalar potential models. Finally, we point out that this time dependence arises from inflationary particle production and is therefore unlikely to endanger the preservation of super-horizon correlations as a record of inflation.

AB - We comment on the recent arguments by Senatore and Zaldarriaga that loop corrections to the ζ-ζ correlator cannot grow with time after first horizon crossing. We first emphasize the need to search for such secular dependence in corrections whose in-out matrix elements are infrared singular on an infinite spatial manifold. Then we give examples of such time dependence from pure quantum gravity and from scalar potential models. Finally, we point out that this time dependence arises from inflationary particle production and is therefore unlikely to endanger the preservation of super-horizon correlations as a record of inflation.

KW - Cosmology

KW - Inflation

KW - Infrared logarithms

KW - Quantum gravity

KW - Quantum loop effects

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The ζ-ζ correlator is time dependent

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