广义相对论中不同符号约定的比较与转换

分析比较了在广义相对论中由度规、里奇张量,以及宇宙学常数的定义不同而导致的不同的符合约定,并给出了不同符合约定之间的转换关系.     

关于费曼传播子在位形空间的解析式

We correct an inaccurate result of previous work on the Feynman propagator in position space of a free Dirac field in （3 ＋ 1）-dimensional spacetime; we derive the generalized analytic formulas of both the scalar Feynman propagator and the spinor Feynman propagator in position space in arbitrary （D ＋ 1）- dimensional spacetime; and we further find a recurrence relation among the spinor Feynman propagator in （D＋1）-dimensional spacetime and the scalar Feynman propagators in （D＋1）-, （D-1）- and （D＋3）-dimensional spacetimes.