Dark Energy The Vacuum Energy? Relevant to Dynamical symmetry breaking Or Explicit symmetry breaking? A 8TG 2 m<0|:g(0)q(0):|0 m F.R. Urban and A R. Zhitnitsky, Phys. Lett ooD grav B688,9(2010;Phys.Rev,D80,063001 May92013@(2809;Nuc.phys.B835,135(2010);alo from Prof Ma Wei-XingMay 9, 2013 @ USTC What Is Vacuum? Are We In Vacuum?    =   = ' . 2 | 0 |: (0) (0) :| 0 |, f q QCD grav HN c m q q m c c c F. R. Urban and A. R. Zhitnitsky, Phys. Lett., B688, 9 (2010; Phys. Rev, D 80, 063001 (2009); Nucl. Phys. B835, 135 (2010); also from Prof. Ma Wei-Xing 3 8 G    =  Dark Energy The Vacuum Energy? Relevant to Dynamical symmetry breaking Or Explicit symmetry breaking?