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arXiv 2502.09481astro-ph.COgr-qchep-phhep-th
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非微扰哈密顿量和USR膨胀中的高阶环修正

Non-Perturbative Hamiltonian and Higher Loop Corrections in USR Inflation

School of Astronomy, Institute for Research in Fundamental Sciences (IPM)(天文学院,基础科学研究院)

Hassan Firouzjahi, Bahar Nikbakht

AI总结:

本文基于USR膨胀的EFT,在去耦极限下推导了非微扰哈密顿量,并计算了高阶环修正,揭示了在长尺度CMB上环修正随环数增加而迅速增长的问题。

摘要:

在宇宙扰动理论中,计算高阶作用和相互作用哈密顿量是一项繁琐的任务。我们采用膨胀EFT的正式主义,在单场超慢滚动(USR)膨胀的去耦极限下,推导出以Goldstone场π表示的非微扰哈密顿量。为完成词典,给出了曲率扰动与π之间的非线性关系。利用这些结果,我们计算了具有陡峭过渡到吸引子相的USR模型中的高阶环修正,这对PBHs的形成至关重要。在理想化的情况下,即从USR相到SR相的过渡是瞬间且陡峭的,长尺度CMB上的环修正随着环数L的增加而迅速增加,可能导致系统脱离微扰控制。

英文摘要:

Calculating the action and the interaction Hamiltonian at higher orders in cosmological perturbation theory is a cumbersome task. We employ the formalism of EFT of inflation in the decoupling limit for single-field ultra slow-roll (USR) inflation and obtain a non-perturbative Hamiltonian in terms of the Goldstone field $π$. To complete the dictionary, a non-linear relation between the curvature perturbations and $π$ is presented. Using these results, we compute higher-order loop corrections in USR models with a sharp transition to the attractor phase, relevant for PBHs formation. It is shown that in the idealized picture in which the transition from the USR phase to SR phase is instantaneous and sharp, the loop corrections on long CMB scales increase rapidly with the number of loops $L$ and the setup may go out of perturbative control.

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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