Universal Torsion-Induced Interaction from Large Extra Dimensions

Lay Nam Chang, Oleg Lebedev, Will Loinaz, Tatsu Takeuchi
2000 Physical Review Letters  
We consider the Kaluza-Klein (KK) scenario in which only gravity exists in the bulk. Without the assumption of symmetric connection, the presence of brane fermions induces torsion. The result is a universal axial contact interaction that dominates those induced by KK gravitons. This enhancement arises from a large spin density on the brane. Using a global fit to Z-pole observables, we find the 3 sigma bound on the scale of quantum gravity to be 28 TeV for n=2. If Dirac or light sterile
more » ... ht sterile neutrinos are present, the data from SN1987A increase the bound to √(n)M_S >= 210 TeV.
doi:10.1103/physrevlett.85.3765 pmid:11041922 fatcat:kmsgt4oasnhbvppapwwwg23gty