广义相对论 Rv-gwR°=-8CT4v d2=R2{dr2/1-r2)+r2(d02+sin2do2)} Einstein ↓ d2=R(t)2{dr2/1-a2)+r2(d02+sin20do2)} Friedmann a(t)=R(t)/R(t)=R(t)/R,a=a(t)=1 0=0,p=0,dl=R(t)dr/V1-a2{ /(1 ) ( sin )} Einstein 2 2 2 2 2 2 2 2 dl  R dr  r  r d  d 2 0 0 0 0 2 2 2 2 2 2 2 2 0, 0, ( ) / 1 ( ) ( )/ ( ) ( )/ , ( ) 1 ( ) { /(1 ) ( sin )} Friedmann dl R t dr kr a t R t R t R t R a a t dl R t dr kr r d d                     R gR T c G 4 8 2 1   