SCALING THEORY FOR THE QUANTUM SPIN-GLASS TRANSITION

We present a scaling theory for the low-temperature phase transition o f the Ising spin glass in a transverse magnetic held (Gamma). The theo ry provides relations and bounds on some critical exponents, which are supported by results from actual calculations. A renormalization-grou p analysis of the zero-temperature transition in the presence of a lon gitudinal symmetry-breaking held enables us to estimate the critical e xponents beta and gamma, associated with the Edwards-Anderson order pa rameter and the nonlinear susceptibility, respectively. We have found no indications of the transition being of first order.