Boolean: "String Theory" +Gravity (1,370,000),
Terms: quantum theory of gravity (76,800), graviton (1,960,000), gravitons (378,000), spin 2 particles (1,200), quantum gravity (2,970,000),
Terms: tachyons (275,000), squared mass (12,800), mass squared (45,100),
Terms: higgs field (145,000), higgs mechanism (104,000), charged bose einstein condensate (10), meissner effect (88,100), superconductor (4,120,000), london penetration depth (16,700), paired electrons (26,500), cooper pairs (115,000),
Terms: qcd vacuum (30,300), qed vacuum (1,790), vacuum state (196,000), gluon condensate (11,200), quark condensate (20,600),