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Nonminimal couplings and preheating effects in R2-Higgs inflation after ACT and SPT data

  • Haneesh Gonuguntla
  • Tanmoy Modak
  • Arnab Samanta
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Abstract

We study the effects of dimension-four and dimension-six nonminimal Higgs couplings to the Ricci scalar R in the R2-Higgs inflation model in light of the recent ACT and SPT observations. We show that the dimension-six operators |Φ|2 R2 and |Φ|4 R can accommodate the enhanced scalar spectral index ns preferred by the combined CMB+BAO analyses. Using a doubly covariant formalism, we find that the same region of parameter space that explains the observed value of ns can also induce rapid preheating through the production of the Goldstone modes. If thermalization proceeds efficiently through this preheating mechanism, it may help match the inflationary scale with the CMB reference scale.

Versions

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Cite

BibTeXRIS
BibTeX
@misc{gonuguntla2026nonminimal,
  title = {{Nonminimal couplings and preheating effects in $R^2$-Higgs inflation after ACT and SPT data}},
  author = {Haneesh Gonuguntla and Tanmoy Modak and Arnab Samanta},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2606.11929},
  eprint = {2606.11929},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2606.11929},
}
RIS
TY  - UNPB
TI  - Nonminimal couplings and preheating effects in R^2-Higgs inflation after ACT and SPT data
AU  - Haneesh Gonuguntla
AU  - Tanmoy Modak
AU  - Arnab Samanta
PY  - 2026
DA  - 2026/10/12
PB  - arXiv
DO  - 10.48550/arxiv.2606.11929
UR  - https://arxiv.org/abs/2606.11929
AB  - We study the effects of dimension-four and dimension-six nonminimal Higgs couplings to the Ricci scalar R in the R^2-Higgs inflation model in light of the recent ACT and SPT observations. We show that the dimension-six operators |Φ|^2 R^2 and |Φ|^4 R can accommodate the enhanced scalar spectral index n_s preferred by the combined CMB+BAO analyses. Using a doubly covariant formalism, we find that the same region of parameter space that explains the observed value of n_s can also induce rapid preheating through the production of the Goldstone modes. If thermalization proceeds efficiently through this preheating mechanism, it may help match the inflationary scale with the CMB reference scale.
ER  -