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arXiv 0906.1902astro-ph.COgr-qchep-th
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诱导引力中的暴胀和再加热

Inflation and Reheating in Induced Gravity

A. Cerioni, F. Finelli, A. Tronconi, G. Venturi

摘要:

在诱导引力(IG)$γσ^2 R$的背景下研究暴胀,其中$R$是Ricci标量,$σ$是标量场,$γ$是无量纲常数.我们详细研究了IG中的宇宙学扰动,考察了Landau-Ginzburg(LG)和Coleman-Weinberg(CW)势玩具模型的小场和大场(混沌)暴胀,发现IG中的小场暴胀模型被WMAP 5年的观测数据约束为$γ\lesssim 3 \times 10^{-3}$.最后,我们描述了制度的相干振荡诱导引力的解析近似,显示如何均匀暴胀子可以衰减在其短尺度波动时,它振荡周围的非零值$σ_0$。

英文摘要:

Inflation is studied in the context of induced gravity (IG) $γσ^2 R$, where $R$ is the Ricci scalar, $σ$ a scalar field and $γ$ a dimensionless constant. We study in detail cosmological perturbations in IG and examine both a Landau-Ginzburg (LG) and a Coleman-Weinberg (CW) potential toy models for small field and large field (chaotic) inflation and find that small field inflationary models in IG are constrained to $γ\lesssim 3 \times 10^{-3}$ by WMAP 5 yrs data. Finally we describe the regime of coherent oscillations in induced gravity by an analytic approximation, showing how the homogeneous inflaton can decay in its short-scale fluctuations when it oscillates around a non-zero value $σ_0$.

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。

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