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arXiv 2202.05862astro-ph.COhep-phhep-th
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暴胀期间的粒子产生:使用 Planck 2018 的 CMB 数据进行的贝叶斯分析

Particle production during inflation: A Bayesian analysis with CMB data from Planck 2018

Suvedha Suresh Naik, Kazuyuki Furuuchi, Pravabati Chingangbam

AI总结:

本文利用 Planck 2018 CMB 数据和贝叶斯证据分析暴胀期间粒子产生模型,发现多凸起模型优于 $Λ$CDM,并将耦合参数约束为 $g<0.05$。

摘要:

一类涉及快速粒子产生爆发的暴胀模型预言了可观测特征,例如原初标量功率谱中的类凸起特征。在本工作中,我们通过将这些模型的预言与 Planck 2018 的最新 CMB 数据进行比较来分析它们。我们考虑两种粒子产生情景。第一种是简单情景,由可观测暴胀期间的单次粒子产生爆发组成。第二种由多次粒子产生爆发组成,它们在原初功率谱中产生一系列类凸起特征。我们发现,与协调的 $Λ$CDM 模型相比,多凸起模型的第二种情景对 CMB 数据给出了更好的拟合。我们使用贝叶斯证据进行了模型比较。根据对多凸起模型原初特征振幅的观测约束,我们发现负责粒子产生的耦合参数 $g$ 被约束为 $g<0.05$。

英文摘要:

A class of inflationary models that involve rapid bursts of particle productions predict observational signatures, such as bump-like features in the primordial scalar power spectrum. In this work, we analyze such models by comparing their predictions with the latest CMB data from Planck 2018. We consider two scenarios of particle production. The first one is a simple scenario consisting of a single burst of particle production during observable inflation. The second one consists of multiple bursts of particle production that lead to a series of bump-like features in the primordial power spectrum. We find that the second scenario of the multi-bump model gives better fit to the CMB data compared to the concordance $Λ$CDM model. We carried out model comparisons using Bayesian evidences. From the observational constraints on the amplitude of primordial features of the multi-bump model, we find that the coupling parameter $g$ responsible for particle production is bound to be $g< 0.05$.

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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