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Universal CMB Phase Coherence from Single-Field Inflation

  • Siméon Vareilles
  • Thomas Colas
  • Julien Grain
  • Federico Piazza
  • Vincent Vennin
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Abstract

The phase coherence of primordial perturbations shapes the acoustic peaks of the CMB and is regarded as a key signature of inflation. Inflationary scenarios at different energy scales, thus with different durations, are commonly expected to leave different levels of coherence. We show this expectation fails: because the curvature perturbation is conserved on super-Hubble scales, the coherence at recombination inherits a value fixed by the observed primordial spectrum alone. This holds irrespective of the inflationary energy scale and the subsequent expansion history.

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Cite

BibTeXRIS
BibTeX
@misc{vareilles2026universal,
  title = {{Universal CMB Phase Coherence from Single-Field Inflation}},
  author = {Siméon Vareilles and Thomas Colas and Julien Grain and Federico Piazza and Vincent Vennin},
  howpublished = {HAL},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.03012},
  eprint = {2609.03012},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05742735v1},
}
RIS
TY  - UNPB
TI  - Universal CMB Phase Coherence from Single-Field Inflation
AU  - Siméon Vareilles
AU  - Thomas Colas
AU  - Julien Grain
AU  - Federico Piazza
AU  - Vincent Vennin
PY  - 2026
DA  - 2026/09/02
PB  - HAL
DO  - 10.48550/arxiv.2609.03012
UR  - https://hal.science/hal-05742735v1
AB  - The phase coherence of primordial perturbations shapes the acoustic peaks of the CMB and is regarded as a key signature of inflation. Inflationary scenarios at different energy scales, thus with different durations, are commonly expected to leave different levels of coherence. We show this expectation fails: because the curvature perturbation is conserved on super-Hubble scales, the coherence at recombination inherits a value fixed by the observed primordial spectrum alone. This holds irrespective of the inflationary energy scale and the subsequent expansion history.
ER  -