4d Conformal Field Theories and Strings on Orbifolds

Details 4d Conformal Field Theories and Strings on Orbifolds 4d Conformal Field Theories and Strings on Orbifolds

1998-02-25

arxiv.org/abs/hep-th/9802183v3

Phys.Rev.Lett.80:4855-4858,1998

Physics

High Energy Physics

High Energy Physics - Theory

11 pages, harvmac big. Reference added

Scientific paper

10.1103/PhysRevLett.80.4855

We propose correspondences between 4d quantum field theories with N=2,1,0 (super)conformal invariance and Type IIB string theory on various orbifolds. We argue using the spacetime string theory, and check using the beta functions (exactly for N=2,1 and so far at 1-loop for the gauge couplings in the N=0 case), that these theories have conformal fixed lines. The latter case potentially gives well-defined non-supersymmetric vacua of string theory, with a mechanism for making the curvature and cosmological constant small at nontrivial string coupling. We suggest a correspondence between nonsupersymmetric conformal fixed lines and nonsupersymmetric string vacua with vanishing vacuum energy.

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