Fractal Dimension of Backbone of Eden Trees
  We relate the fractal dimension of the backbone, and the spectral dimension of Eden trees to the dynamical exponent z. In two dimensions, it gives fractal dimension of backbone equal to 4/3 and spectral dimension of trees equal to 5/4. In three dimensions, it provides us a new way to estimate z numerically. We get z=1.617 +/- 0.004. 
S. S. Manna (Indian Institute of Technology, Mumbai) and D. Dhar (Tata   Institute of Fundamental Research, Mumbai)