EntityQ849940· pop 31· linked from 309 articlesvirtual particleSign in to savetransient fluctuations of physical fields with existence limited and required by the uncertainty-principleConnectionselectromagnetismEntitymagnetic fieldEntitystrong interactionEntitytauEntityup quarkEntitycharm quarkEntitypionEntitydown quarkEntitytop quarkEntitystrange quarkEntitybottom quarkEntitypair productionEntityCasimir effectEntityfalse vacuumEntityforce carrierEntitycreation and annihilation operatorsEntityOn shell and off shellEntityatomEntityenergyEntitymoleculeEntityCategoriesConcepts in physicsQuantum field theory