We show, within the single-field inflationary paradigm, that a linear non-minimal interaction ξ M _P ϕ R between the inflaton field ϕ and the Ricci scalar R can result in successful inflation that concludes with an efficient heating of the Universe via perturbative decays of the inflaton, aided entirely by gravity. Considering the inflaton field to oscillate in a quadratic potential, we find that 𝒪(10^-1) ≲ 𝒪 ≲ 𝒪(10²) is required to satisfy the observational bounds from Cosmic Microwave Background (CMB) and Big Bang Nucleosynthesis (BBN). Interestingly, the upper bound on the non-minimal coupling guarantees a tensor-to-scalar ratio r ≳ 10^-4, within the range of current and future planned experiments. We also discuss implications of dark matter production, along with the potential generation of the matter-antimatter asymmetry resulting from inflaton decay, through the same gravity portal.

中文翻译：

---

拯救混沌暴胀中的引力再加热


我们证明，在单场暴胀范式中，暴胀场 phi 和 Ricci 标量 R 之间的线性非最小相互作用 xi M _P phi R 可以导致成功的暴胀，并以有效的加热结束。宇宙通过暴胀子的微扰衰变，完全在重力的帮助下。考虑到暴胀场以二次势振荡，我们发现需要 𝒪(10 ^-1 ) ≲ 𝒪 ≲ 𝒪(10 ² ) 来满足宇宙微波背景的观测界限（CMB）和大爆炸核合成（BBN）。有趣的是，在当前和未来计划的实验范围内，非最小耦合的上限保证了张量与标量的比率 r ≳ 10 ^-4 。我们还讨论了暗物质产生的影响，以及通过相同的重力门户因暴胀衰变而可能产生的物质-反物质不对称性。