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We apply Kadanoff's theory of marginal deformations of conformal fieldtheories to twistfield deformations of Z_2 orbifold models in K3 moduli space.These deformations lead away from the Z_2 orbifold sub-moduli-space and hencehelp to explore conformal field theories which have not yet been understood. Inparticular, we calculate the deformation of the conformal dimensions of vertexoperators for p^2<1 in second order perturbation theory.Comment: Latex2e, 19 pages, 1 figur

Twistfield perturbations of vertex operators in the Bbb Z2-orbifold model

Twistfield perturbations of vertex operators in the Bbb Z₂-orbifold model