报告人：黄民信教授，中国科学技术大学
邀请人：何松教授
报告时间：2025年6月10日（周二），14:00
报告地点：龙赛理科楼南楼401报告厅

报告人简介：
黄民信，2004年博士毕业于宾夕法尼亚大学，先后在威士康星大学，欧洲核子研究中心，东京大学卡弗利数物连携宇宙研究机构做博士后。他2012年回到中国科学技术大学任教授，入选国家青年人才计划，2023获得国家杰出青年科学基金资助。他的研究领域为超弦理论相关课题，主要涉及拓扑弦理论、规范/引力全息对偶以及弦宇宙学。

报告摘要：
Penrose limit provides a promising avenue to the stringy regime of the AdS/CFT holography, giving rise to the pp-wave background. We propose a probability interpretation of the Berenstein-Maldacena-Nastase (BMN) two-point functions in free N=4 super-Yang-Mills theory in terms of the dual tensionless strings in the infinite curvature limit. If our proposal is correct, it would not only provide the first examples of systematic calculations of the norms of higher genus critical superstring amplitudes, but may also in principle gives exact complete results for any string coupling, due to the convergence of genus expansion. We further provide a natural definition of the entropy of these BMN strings in the presence of an observer, and derive an entropy bound. Finally, we compare with thermal entropy in Calabi-Yau quantum systems and discuss a possible cosmological application.

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