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PreprintCC BY 4.0arXiv

Exploring mutated hilltop inflation in $f(ϕ, T)$ gravity with latest CMB and DESI observations

  • Biswajit Deb
  • Atri Deshamukhya
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Abstract

The high-precision observations from the Planck and BICEP/Keck have imposed stringent bounds on the tensor-to-scalar ratio, ruling out many standard inflationary models. The recent bound from Atacama and SPT along with DESI provides a different viable landscape, making it difficult for the inflationary models to sustain. Amid these increasingly stringent and conflicting observational constraints, modified gravity theories offer a compelling avenue to restore the viability of inflationary models. With this motivation, we study mutated hilltop inflation within $f(ϕ, T)$ gravity, where a scalar field is non-minimally coupled to the trace of the energy-momentum tensor. The scalar spectral index ns, the tensor spectral index nt, and the tensor-to-scalar ratio r are calculated, and their trajectories are presented in the ns−r plane. The results are then confronted with the latest combined CMB bounds from Planck, BICEP/Keck, ACT DR6, SPT, and DESI DR2. We report that MHI can predict r ∼ 10−3 and is compatible with the latest CMB & DESI bound SPA+BK+DESI at $ 1σ$ CL.

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Cite

BibTeXRIS
BibTeX
@misc{deb2026exploring,
  title = {{Exploring mutated hilltop inflation in $f(ϕ, T)$ gravity with latest CMB and DESI observations}},
  author = {Biswajit Deb and Atri Deshamukhya},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.28720},
  eprint = {2609.28720},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.28720},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Exploring mutated hilltop inflation in $f(ϕ, T)$ gravity with latest CMB and DESI observations
AU  - Biswajit Deb
AU  - Atri Deshamukhya
PY  - 2026
DA  - 2026/09/23
PB  - arXiv
DO  - 10.48550/arxiv.2609.28720
UR  - https://arxiv.org/abs/2609.28720
AB  - The high-precision observations from the Planck and BICEP/Keck have imposed stringent bounds on the tensor-to-scalar ratio, ruling out many standard inflationary models. The recent bound from Atacama and SPT along with DESI provides a different viable landscape, making it difficult for the inflationary models to sustain. Amid these increasingly stringent and conflicting observational constraints, modified gravity theories offer a compelling avenue to restore the viability of inflationary models. With this motivation, we study mutated hilltop inflation within $f(ϕ, T)$ gravity, where a scalar field is non-minimally coupled to the trace of the energy-momentum tensor. The scalar spectral index n_s, the tensor spectral index n_t, and the tensor-to-scalar ratio r are calculated, and their trajectories are presented in the n_s−r plane. The results are then confronted with the latest combined CMB bounds from Planck, BICEP/Keck, ACT DR6, SPT, and DESI DR2. We report that MHI can predict r ∼ 10^−3 and is compatible with the latest CMB & DESI bound SPA+BK+DESI at $ 1σ$ CL.
ER  -