▁quantum ▁level . ▁Their ▁introduction ▁of ▁an ▁" an om alous " ▁term ▁from ▁quantum ▁field ▁theory ▁required ▁that ▁the ▁sum ▁of ▁the ▁charges ▁of ▁the ▁elementary ▁ferm ions ▁had ▁to ▁be ▁zero . ▁This ▁work ▁also ▁gave ▁important ▁support ▁to ▁the ▁color - theory ▁of ▁qu arks . ▁ ▁Jack iw ▁is ▁also ▁known ▁for ▁Jack iw – Te itel bo im ▁gravity , ▁a ▁theory ▁of ▁gravity ▁with ▁one ▁dimension ▁each ▁of ▁space ▁and ▁time ▁that ▁includes ▁a ▁dil aton ▁field . ▁Sometimes ▁known ▁as ▁the ▁R ▁= ▁T ▁model ▁or ▁as ▁J T ▁gravity , ▁it ▁is ▁used ▁to ▁model ▁some ▁aspects ▁of ▁near - ext rem al ▁black ▁holes . ▁ ▁One ▁of ▁his ▁sons ▁is ▁Stefan ▁Jack iw , ▁an ▁American ▁viol in ist . ▁The ▁other ▁is ▁Nicholas ▁Jack iw , ▁a ▁software ▁designer ▁known ▁for ▁invent ing ▁The ▁Ge ometer ' s ▁Sk etch pad . ▁His ▁daughter , ▁Sim one ▁A hl born , ▁is ▁an ▁educ ator ▁at ▁Mos es ▁Brown ▁School ▁in ▁Prov idence , ▁Rh ode ▁Island . ▁ ▁Awards ▁Hein eman ▁Prize , ▁ 1 9 9 5 ▁On ▁May ▁ 2 6 , ▁ 2 0 0 0 ▁Jack iw ▁received ▁an ▁honor ary ▁doctor ate ▁from ▁the ▁Fac ulty ▁of ▁Science ▁and ▁Technology ▁ ▁at ▁U pp s ala ▁University , ▁Sweden ▁ ▁References ▁ ▁External ▁links ▁ ▁M IT ▁web ▁page ▁for ▁Roman ▁Jack iw ▁ ▁Di rac ▁Medal ▁website ' s ▁description ▁of ▁Jack iw ' s