Dilaton Condensation in the Covariantized Light-Cone Closed String Field Theory

Abstract

We analyze dilaton condensation in the covariantized light·cone closed string field theory. We show by explicit calculation that an infinitesimal condensation of the dilaton field gives rise to the shift of the string coupling constant 9 by an amount (Jg= -(Cd -2)/2)g, where d is the space-time dimension. This agrees with Yoneya's result obtained in the light-cone gauge string field theory. We also show that the direct effect of the dilaton condensation is interpreted as the Weyl-scaling of the full OSP(d -1,112) metric including the ghost direction also.