## 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 |
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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 | |

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 |
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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