寻找对方案和能标变化的稳定点 任意物理量可定义有效荷=>有效能标 ===============================================5H Any observable <- an effective coupling constant (dea useful)I Optimized perturbation theory Fastest Apparent Convergence(FAC l minimize the higher-order contributions- PMS How about directly set it to satisfy the RG invariance How about directly cut off all higher-order-terms =======================================================1 早期解决方案=寻找最优能标 典型 四类 tEEa =============== 所有真空极化图贡献 = 相加确定能标 Using rge GML案 Runs fromμ BLM=> nf-term QED不存在重整化能标: e.g. USIng a5u2a)+… ED极限=GML方案 设定问题 n"=== ======== ======= (csR=>解决方案不确定性 1/137-本身数倒小早期解决方案＝寻找最优能标 Optimized perturbation theory – minimize the higher-order contributions – PMS How about directly set it to satisfy the RG invariance 寻找对方案和能标变化的稳定点 BLM=> nf-term QED极限＝GM-L方案 CSR＝>解决方案不确定性 Any observable <=> an effective coupling constant (idea useful) Fastest Apparent Convergence (FAC) How about directly cut off all higher-order-terms ? 任意物理量可定义有效荷=>有效能标 Using RGE Runs from 1 -> 2 e.g. using s (1 )=s (2 )+… 典型 四类