arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2102.02712astro-ph.COgr-qchep-phhep-th
收藏

Palatini $R^2$充气中的快速电子预热

Tachyonic Preheating in Palatini $R^2$ Inflation

Alexandros Karam, Eemeli Tomberg, Hardi Veermäe

备注：
Matches published version
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

我们研究预热的Palatini形式主义与二次暴胀潜力和一个额外的$αR^2$长期。在这样的模型中，振荡的暴胀子场反复回到爱因斯坦框架势的平台，在那里，快子不稳定性在不到e倍的范围内将暴胀子凝聚体破碎。我们发现，快子预热发生时$α\gtrsim 10^{13}$和碎片场的能量密度增长率$Γ/H \approx 0.011 \times α^{0.31}$。该模型扩展了具有类似预热行为的平台模型家族。虽然它包含在爱因斯坦框架中的非正则四次动力学项，我们表明，在第一近似，这些可以忽略不计在预热和通货膨胀。

英文摘要：

We study preheating in the Palatini formalism with a quadratic inflaton potential and an added $αR^2$ term. In such models, the oscillating inflaton field repeatedly returns to the plateau of the Einstein frame potential, on which the tachyonic instability fragments the inflaton condensate within less than an e-fold. We find that tachyonic preheating takes place when $α\gtrsim 10^{13}$ and that the energy density of the fragmented field grows with the rate $Γ/H \approx 0.011 \times α^{0.31}$. The model extends the family of plateau models with similar preheating behaviour. Although it contains non-canonical quartic kinetic terms in the Einstein frame, we show that, in the first approximation, these can be neglected during both preheating and inflation.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑