Spurious secular growth from loops in de Sitter

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• Gonzalo Palma (Universidad de Chile, Santiago)
• Monday 10 February 2025, 13:00-14:00
• CMS, Pav. B, CTC Common Room (B1.19) [Potter Room].

If you have a question about this talk, please contact Thomas Colas.

A well-established result in QFT in four-dimensional de Sitter spacetime states that the vacuum of a massless scalar field lacks a normalizable inner product. This has often been interpreted as evidence that the vacuum cannot remain invariant under the full de Sitter isometry group, suggesting the emergence of time-dependent (secular) growth in correlation functions computed in inflationary coordinates. However, the standard quantization of scalar fields in de Sitter spacetime using inflationary coordinates yields a vacuum state for the massless scalar field that explicitly preserves de Sitter symmetries, albeit with infrared divergences. In this talk, I will discuss the computation of n-point correlation functions and demonstrate that loop corrections do not further enhance the secular growth of these functions for massless scalars. I will also address the discrepancies between our findings and those reported in previous studies.

This talk is part of the Cosmology Lunch series.

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