Recently, a proposal to obtain finite contribution of second derivative order the gravitational field equations in \(D = 4\) dimensions from renormalized Gauss-Bonnet term action has received wave attention. It triggered discussion whether employed renormalization procedure yields well-defined theory. One main criticisms is based on fact that resulting cannot be obtained as Euler-Lagrange diffe...

We generalize the method of quantizing effective strings proposed by Polchinski and Strominger to superstrings. The Ramond-Neveu-Schwarz string is different from the Green-Schwarz string in non-critical dimensions. Both are anomaly-free and Poincare invariant. Some implications of the results are discussed. The formal analogy with 4D (super)gravity is pointed out.

We measure numerically the distribution of baby universes in the crumpled phase of the dynamical triangulation model of 4d quantum gravity. The relevance of the results to the issue of an exponential bound is discussed. The data are consistent with the existence of such a bound.

We investigate 4d SU(2) lattice gauge theory with Regge–Einstein quantum gravity on a dynamically coupled Regge skeleton. To overview the phase diagram we perform simulations on a small 2 ·4 system. Evidence for an entropy– dominated disordered, an entropy–dominated ordered and an ill–defined region is presented. Submitted to Physics Letters B. On sabbatical from the Florida State University.