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摘要：Neutrinoless double beta decay is a key probe of physics beyond the Standard Model, whose interpretation relies on accurate nuclear matrix elements. These matrix elements are strongly influenced by both the decay operator and nuclear many-body correlations. In this talk, I present recent progress based on relativistic approaches. On the operator side, a Lorentz-invariant chiral framework is developed, showing that the leading-order transition amplitude can be renormalized without unknown short-range contributions, providing a model-independent basis for nuclear-structure calculations. On the many-body side, relativistic configuration-interaction density functional theory is developed to incorporate triaxial deformation. Applications to 76Ge show that triaxiality can significantly enhance the neutrinoless double beta decay matrix element. Combining the relativistic decay operator with relativistic many-body wavefunctions, nuclear matrix elements for 48Ca, 76Ge, 82Se, 100Mo, and 136Xe are calculated with substantially reduced short-range uncertainties.
个人简介：赵鹏巍， 2012年获北京大学理学博士学位，先后在日本京都大学基础物理学研究所（YITP）、美国阿贡国家实验室工作。2018年，入选国家海外高层次青年人才引进计划，同年入职北京大学物理学院。主要研究方向包括相对论量子多体理论、相对论有效场论、奇特原子核性质、基本对称性及其破缺等，发表论文126篇，包括《Physical Review Letters》论文12篇，总引用5000多次，H因子为39。