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宁波大学 余洪伟教授:“Can spacetime curvature corrections to Lamb shift be observable?”
2013-06-19 00:00   审核人:

报告时间:6月20日(周四)下午2:30

报告地点:南山校区一号楼411(物电系教师休息室)

Abstract: The Lamb shift results from the coupling of an atom to vacuum fluctuations of quantum

fields, so corrections are expected to arise when the spacetime is curved since the vacuum

fluctuations are modified by the presence of spacetime curvature. Here, we calculate the curvature

-induced correction to the Lamb shift outside a spherically symmetric object and demonstrate that

this correction can be remarkably significant outside a compact massive astrophysical body. For

instance, for a neutron star or a stellar mass black hole, the correction is $\sim$ 25% at a radial

distance of $4GM/c^2$, $\sim$ 16% at $10GM/c^2$ and as large as $\sim$ 1.6% even at

$100GM/c^2$, where $M$ is the mass of the object, $G$ the Newtonian constant, and $c$ the

speed of light. In principle, we can look at the spectra from a distant compact supermassive body to

find such corrections. Therefore, our results suggest a possible way of detecting fundamental

quantum effects in astronomical observations.

概况:余洪伟,宁波大学特聘教授,湖南师大博士生导师,在美国Tufts大学获得博士学位。教育部高等学校物理专业教学引导委员会委员,教育部“新世纪优秀人才”,教育部“长江学者与创新团队发展计划”创新团队学术带头人, 享受国务院政府特殊津贴专家。长期致力于量子理论基本问题,相对论与引力,真空量子涨落与弯曲时空量子效应以及宇宙学等方面的研究,发表SCI论文140余篇,其中包括美国《Physical Review Letters》在内的SCI一区和二区论文80余篇, 被同行引用1200余次。1991年度获得国际引力研究基金荣誉奖(美国),2008年获得湖南省科技进步一等奖(排名第一),引导学生分别获得2008年全国百篇优秀博士学位论文和2011年全国百篇优秀博士学位论文提名论文。

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