Fermionic zero-norm states and enlarged supersymmetries of Type II string
We calculate the NS-R fermionic zero-norm states of type II string spectrum. The massless and some possible massive zero-norm states are identified to be responsible for the space-time supersymmetry. The existence of other fermionic massive zero-norm state
Fermioniczero-normstatesandenlargedsupersymmetriesof
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aTypeIIstringJen-ChiLee DepartmentofElectrophysics,NationalChiaoTungUniversity,Hsinchu30050,Taiwan,R.O.C(February1,2008)AbstractWecalculatetheNS-Rfermioniczero-normstatesoftypeIIstringspec-trum.Themasslessandsomepossiblemassivezero-normstatesareidenti- edtoberesponsibleforthespace-timesupersymmetry.Theexistenceofotherfermionicmassivezero-normstateswithhigherspinor-tensorindicescorrespondtonewenlargedboson-fermionsymmetriesofthetheoryathighenergy.WealsodiscusstheR-RchargesandR-Rzero-normstatesandjustifythatperturbativestringdoesnotcarrythemasslessR-Rcharges.However,theexistenceofsomemassiveR-Rzero-normstatesmakeusspeculatethatstringmaycarrysomemassiveR-Rcharges.
