M-theory and hypercharge

Neil D Lambert, Peter C West
1999 Journal of High Energy Physics  
We discuss the possibility that the electro-weak and strong interactions arise as the low energy effective description of branes in M-theory. As a step towards constructing such a model we show how one can naturally obtain SU(N_1)\times SU(N_2)\times U(1) gauge theories from branes, including matter in the bi-fundamental representation of SU(N_1)\times SU(N_2) which are fractionally charged under U(1).
doi:10.1088/1126-6708/1999/09/021 fatcat:v6sygqlxyfccnlt5aumjq2dy2m