English

Inflation Model Based on Virasoro Squeezing

High Energy Physics - Theory 2026-05-12 v4 Cosmology and Nongalactic Astrophysics

Abstract

We propose a novel mechanism for realizing slow-roll inflation that is fully consistent with observational data, based on conformal transformations acting exclusively on a complex scalar field -- without coupling to the gravitational sector. These transformations generically produce a plateau in the inflaton potential, as guaranteed by the maximum modulus theorem, thereby naturally satisfying the slow-roll conditions. Our framework utilizes squeezing operations generated by the Virasoro algebra without central extension, as developed in our earlier work. The resulting inflationary potentials depend on the Virasoro mode nn, the power mm of the original potential, and the squeezing parameter θ\theta. We present approximate analytical expressions at leading order for the special case n=2n=-2, and perform numerical analyses for both n=2n=-2 and other values of nn. These reveal parameter regimes in which the predicted cosmological observables (ns,r)(n_{s},r) align remarkably well with current CMB measurements.

Keywords

Cite

@article{arxiv.2507.02236,
  title  = {Inflation Model Based on Virasoro Squeezing},
  author = {Kenji Ebata and So Katagiri and Yoshiki Matsuoka and Takaaki Sehara and Akio Sugamoto},
  journal= {arXiv preprint arXiv:2507.02236},
  year   = {2026}
}

Comments

38 pages, 5 figures. v2: Minor revisions. Several explanatory footnotes were added to clarify the assumptions and scope of the model, including the role of the squeezing transformation, treatment of quantum fluctuations, and the fixed background metric. v3: Appendix C added. v4: Updated explanations and revised figures

R2 v1 2026-07-01T03:44:10.884Z