arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1702.04247hep-thgr-qcquant-ph
收藏

弯曲空间中的量子力学路径积分与A型迹anomaly

Quantum mechanical path integrals in curved spaces and the type-A trace anomaly

Fiorenzo Bastianelli, Olindo Corradini, Edoardo Vassura

摘要:

弯曲空间中粒子的路径积分可用于计算量子场论中的迹异常,更一般地,可用于研究与引力耦合的量子场在一次量子化中的性质。虽然它们在任意坐标系中的构造是很好理解的,并且已知需要使用正则化方案,但在本文中,我们采用了使用黎曼法坐标构造路径积分的旧建议。该方法假设曲率效应由标量有效势来处理,使得粒子拉格朗日量减少到与有效势相互作用的线性西格玛模型的拉格朗日量。在确定正确的有效势后,我们测试了最大对称性空间上的构造,并使用它来计算任意维度(d=12以内)的标量场的热核系数和A型迹异常。结果与预期的结果一致,这是非常有效的再现和推广到更高的订单。明确证明了极大对称空间上简化的路径积分的有效性。这种简化的路径积分可能在世界线应用中有进一步的用途,尽管它在任意几何空间中的应用还不清楚。

英文摘要:

Path integrals for particles in curved spaces can be used to compute trace anomalies in quantum field theories, and more generally to study properties of quantum fields coupled to gravity in first quantization. While their construction in arbitrary coordinates is well understood, and known to require the use of a regularization scheme, in this article we take up an old proposal of constructing the path integral by using Riemann normal coordinates. The method assumes that curvature effects are taken care of by a scalar effective potential, so that the particle lagrangian is reduced to that of a linear sigma model interacting with the effective potential. After fixing the correct effective potential, we test the construction on spaces of maximal symmetry and use it to compute heat kernel coefficients and type-A trace anomalies for a scalar field in arbitrary dimensions up to d=12. The results agree with expected ones, which are reproduced with great efficiency and extended to higher orders. We prove explicitly the validity of the simplified path integral on maximally symmetric spaces. This simplified path integral might be of further use in worldline applications, though its application on spaces of arbitrary geometry remains unclear.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑