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Peer-reviewedCC BY 4.0Journal of High Energy Physics

Background-independent one-loop renormalization of tensor and scalar primordial spectra

  • Guillermo Ballesteros1,2
  • Jesús Gambín Egea2
  • Flavio Riccardi3,4
4 affiliations
  1. 1Universidad Autónoma de Madrid (UAM)
  2. 2Instituto de Física Teórica UAM-CSIC
  3. 3Sapienza Università di Roma
  4. 4INFN sezione di Roma
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Abstract

We present a background-independent renormalization framework for one-loop primordial spectra. We apply it to two observables: the scalar-induced tensor spectrum sourced by a minimally coupled spectator field, and the scalar spectrum generated by potential self-interactions. In both cases, the UV part of the loops is isolated and, using the universal WKB behavior of the internal modes, the UV poles are extracted analytically and absorbed into local counterterms without having to specify either the background evolution or the full dynamics of the field running in the loop. This yields finite model-independent expressions for the renormalized spectra amenable to numerical analysis.

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Cite

BibTeXRIS
BibTeX
@article{ballesteros2026backgroundindependent,
  title = {{Background-independent one-loop renormalization of tensor and scalar primordial spectra}},
  author = {Guillermo Ballesteros and Jesús Gambín Egea and Flavio Riccardi},
  journal = {Journal of High Energy Physics},
  year = {2026},
  month = nov,
  doi = {10.1007/jhep11(2026)054},
  url = {https://link.springer.com/article/10.1007/JHEP11(2026)054},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Background-independent one-loop renormalization of tensor and scalar primordial spectra
AU  - Guillermo Ballesteros
AU  - Jesús Gambín Egea
AU  - Flavio Riccardi
PY  - 2026
DA  - 2026/11/05
JO  - Journal of High Energy Physics
DO  - 10.1007/jhep11(2026)054
UR  - https://link.springer.com/article/10.1007/JHEP11(2026)054
AB  - We present a background-independent renormalization framework for one-loop primordial spectra. We apply it to two observables: the scalar-induced tensor spectrum sourced by a minimally coupled spectator field, and the scalar spectrum generated by potential self-interactions. In both cases, the UV part of the loops is isolated and, using the universal WKB behavior of the internal modes, the UV poles are extracted analytically and absorbed into local counterterms without having to specify either the background evolution or the full dynamics of the field running in the loop. This yields finite model-independent expressions for the renormalized spectra amenable to numerical analysis.
SN  - 1029-8479
ER  -