In hybrid inflation, initial field values leading to sufficiently long inflation were thought be fine-tuned in a narrow band along the inflationary valley. A re-analysis of this problem has shown that there exists a non negligible proportion of successful initial conditions exterior to the valley, organized in a complex structure with fractal boundaries, and whose origin has been explained. Their existence in a large part of the parameter space has been demonstrated using a bayesian Monte-Carlo-Markov-Chain (MCMC) method, and natural bounds on potential parameters have been established. Moreover, these results are shown to be valid not only for the original hybrid model, but also for other hybrid realizations in various frameworks.
Constraints on non-canonical chaotic inflation from ACT DR6 and BICEP/Keck data
Nanjing University of Aeronautics and Astronautics（南京航空航天大学）；Key Laboratory of Aerospace Information Materials and Physics (NUAA), MIIT（工业和信息化部航空航天信息材料与物理重点实验室）
Toward Efficient and Accurate EMRI Parameter Estimation: A Machine Learning-Enhanced MCMC Framework
Taiji Laboratory for Gravitational Wave Universe (Beijing/Hangzhou), University of Chinese Academy of Sciences (UCAS)（太极引力波宇宙实验室（北京/杭州），中国科学院大学）；National Space Science Center, Chinese Academy of Sciences（中国科学院国家空间科学中心）；School of Physics, Peking University（北京大学物理学院）；Leicester International Institute, Dalian University of Technology（大连理工大学莱斯特国际学院）；Lanzhou Center of Theoretical Physics, Lanzhou University（兰州大学理论物理中心）；Center for Gravitational Wave Experiment, National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences（中国科学院力学研究所国家微重力实验室引力波实验中心）；Key Laboratory of Gravitational Wave Precision Measurement of Zhejiang Province, Hangzhou Institute for Advanced Study, UCAS（浙江省引力波精密测量重点实验室，中国科学院大学杭州高等研究院）；Baidu Inc.（百度公司）
String-inspired Gauss-Bonnet Gravity Inflation and ACT
ICREA；Institute of Space Sciences (IEEC-CSIC)（空间科学研究所（IEEC-CSIC））；L.N. Gumilyov Eurasian National University（欧亚国立大学）；Department of Physics, Aristotle University of Thessaloniki（塞萨洛尼基亚里士多德大学物理系）；Center for Theoretical Physics, Khazar University（哈扎尔大学理论物理中心）
