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M. Spreafico

Publications and source records attributed to M. Spreafico.

22 records · Page 2Linked to original sources

A continuum approach to 2D-Quantum Gravity for c$>$1

Two dimensional induced quantum gravity with matter central charge $c>1$ is studied taking a careful consideration of both diffeomorphism and Weyl symmetries . It is shown that, for the gauge fixing condition $R(g)$ (scalar curvature)=$const$, one obtains a modification of the David-Distler-Kawai version of KPZ scaling. We obtain a class of models with the real string tension for all values $c>1$. They contain an indeterminate parameter which is, however, strongly constrained by the requirement of non triviality of such a model. The possible physical significance of the new model is discussed. In particular we note that it describes smooth surfaces imbedded in $d$-dimensional flat space time for arbitrary $d$, consistently with recent numerical result for $d=3$.

hep-th↗

A Continuum Approach to 2D-Quantum Gravity for C>1

A Lagrangian continuum model for a string theory with central charge $c>1$ is formulated by incorporating Weyl and diffeomorphism gauge fixing. In particular the tachyon scattering amplitudes are deduced generalizing the standard $c\le 1$ computation.

hep-th↗

A continuum string model for $D>1$

The non critical string (2D gravity coupled to the matter with central charge $D$) is quantized taking care of both diffeomorphism and Weyl symmetries. In incorporating the gauge fixing with respect to the Weyl symmetry, through the condition $R_g=const$, one modifies the classical result of Distler and Kawai. In particular one obtains the real string tension for an arbitrary value of central charge $D$.

hep-th↗