Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1992-01-30
Nucl.Phys. B381 (1992) 158-200
Physics
High Energy Physics
High Energy Physics - Theory
44 pages, Figures now included. This replacement version includes the 7 figures as PostScript files appended to the end and th
Scientific paper
10.1016/0550-3213(92)90645-R
Dilaton contact terms in the bosonic and heterotic strings are examined following the recent work of Distler and Nelson on the bosonic and semirigid strings. In the bosonic case dilaton two-point functions on the sphere are calculated as a stepping stone to constructing a `good' coordinate family for dilaton calculations on higher genus surfaces. It is found that dilaton-dilaton contact terms are improperly normalized, suggesting that the interpretation of the dilaton as the first variation of string coupling breaks down when other dilatons are present. It seems likely that this can be attributed to the tachyon divergence found in \TCCT. For the heterotic case, it is found that there is no tachyon divergence and that the dilaton contact terms are properly normalized. Thus, a dilaton equation analogous to the one in topological gravity is derived and the interpretation of the dilaton as the string coupling constant goes through.
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