纯自然膨胀是一种源自自顶向下的加速机制的有效的单场膨胀模型。在本文中，我们证明该模型与来自Atacama Cosmology Telescope的最新CMB约束以及来自Dark Energy Spectroscopic Instrument的宇宙学声学振荡数据相结合后是兼容的。在两种重新加热假设下，我们排除了参数空间中非平凡的一部分。我们还应用我们的分析到该模型的现象学扩展，并绘制了其可行的参数空间。
英文摘要：
Pure natural inflation is a compelling effectively single-field model of inflation stemming from a top-down approach to the acceleration mechanism. In this short letter we show that such model is compatible with the latest CMB constraints obtained from the Atacama Cosmology Telescope combined with baryon acoustic oscillation data from the Dark Energy Spectroscopic Instrument. Under both the instantaneous reheating hypothesis and standard assumptions for reheating, we rule in a non-trivial fraction of the parameter space. We apply our analysis also to a phenomenological extension of the model and chart its viable parameter space.
We study a model of quintessential inflation in the context of Palatini gravity. As a representative example, we consider the Peebles-Vilenkin model of quintessential inflation with a small non-minimal coupling to gravity, which is consistent with the most recent Planck measurements. At the end of inflation, the inflaton field passes through a tachyonic region and it leads to explosive particle production through the tachyonic preheating process. After preheating, the Universe becomes dominated by the kinetic energy of the inflaton and enters a period of kination. Eventually, the total energy …
Primordial Black Holes (PBH) arise naturally from high peaks in the curvature power spectrum of near-inflection-point single-field inflation, and could constitute today the dominant component of the dark matter in the universe. In this letter we explore the possibility that a broad spectrum of PBH is formed in models of Critical Higgs Inflation (CHI), where the near-inflection point is related to the critical value of the RGE running of both the Higgs self-coupling $λ(μ)$ and its non-minimal coupling to gravity $ξ(μ)$. We show that, for a wide range of model parameters, a half-domed-shaped pea…
Recent and upcoming experimental data as well as the possibility of rich phenomenology has spiked interest in studying the quantum gravitational effects in cosmology at low (inflation-era) energy scales. While Planck scale physics is under development, it is still possible to incorporate quantum gravity effects at relatively low energies using quantum field theory in curved spacetime, which serves as a low-energy limit of planck scale physics. We use the Vilkovisky-DeWitt's covariant effective action formalism to study quantum gravitational corrections to a recently proposed Natural Inflation …
A pseudo Nambu-Goldstone boson (such as an axion-like particle) is a theoretically well-motivated inflaton as it features a naturally flat potential (natural inflation). This is because Goldstone's theorem protects its potential from sizable quantum corrections. Such corrections, however, generically generates an $R^2$ term in the action, which leads to another inflaton candidate because of the equivalence between the $R^2$ term and a scalar field, the scalaron, with a quasi flat potential (Starobinsky inflation). Here it is investigated a new multifield scenario in which both the scalaron and…
Single-field D-type inflation in the minimal supergravity in light of Planck-ACT-SPT data
Fudan University（复旦大学）；Tokyo Metropolitan University（东京都立大学）；Tomsk State University（托木斯克国立大学）；Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study（宇宙物理与数学研究所（WPI），东京大学高等研究院）
ACT-DR6 consistent inflation in generalised entropic cosmology and $f(Q)$ gravity
Shanghai Jiao Tong University（上海交通大学）；High Energy Accelerator Research Organization (KEK)（高能加速器研究机构）；Nagoya University（名古屋大学）；Institució Catalana de Recerca i Estudis Avançats (ICREA)（加泰罗尼亚研究与高等研究学院）
(Lovelock)$^2$ inflation: explaining the ACT data and equivalence to Higgs-Gauss-Bonnet inflation
Anqing Normal University（安庆师范大学）；University of Science and Technology of China（中国科学技术大学）；INFN（意大利国家核物理研究所）；Fudan University（复旦大学）；Al-Farabi Kazakh National University（阿尔法拉比哈萨克国立大学）
基于ACT数据重新审视暴胀的斯塔罗宾斯基模型，用二次\(f(L)\)引力\(\sim L + L^2\)解决数据矛盾，其标量 - 张量形式改变暴胀慢滚动力学，还发现与希格斯 - 高斯 - 博内特暴胀等效，改进了对宇宙学数据的拟合。
Shihezi University（石河子大学）；Anhui Normal University（安徽师范大学）；Institute of Theoretical Physics, Chinese Academy of Sciences (CAS)（中国科学院理论物理研究所）；University of Chinese Academy of Sciences（中国科学院大学）；Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences（中国科学院大学杭州高等研究院）
Constraining Quintessential Inflation with ACT: A Gauss-Bonnet Gateway
Institute for Theoretical Physics and Cosmology, Zhejiang University of Technology（浙江工业大学理论物理与宇宙学研究所）；Department of Physics, Islamic University of Science and Technology（伊斯兰科技大学物理系）；Department of Physics, School of Advanced Sciences, Vellore Institute of Technology (VIT)（维罗尔理工学院高级科学学院物理系）；Centre for Cosmology and Science Popularization (CCSP), SGT University（SGT大学宇宙学与科学普及中心）
Shifted Hybrid Realization of Non-Minimal Higgs Inflation in Light of ACT DR6 and Planck Data
Università degli Studi di Padova（帕多瓦大学）；INFN, Sezione di Padova（意大利国家核物理研究所帕多瓦分部）；CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences（中国科学院理论物理研究所理论物理重点实验室）；School of Physical Sciences, University of Chinese Academy of Sciences（中国科学院大学物理科学学院）；Department of Physics, Faculty of Science, Islamic University of Madinah（麦地那伊斯兰大学理学院物理系）
