On Vanishing Two Loop Cosmological Constants in Nonsupersymmetric Strings

Details On Vanishing Two Loop Cosmological Constants in Nonsupersymmetric Strings On Vanishing Two Loop Cosmological Constants in Nonsupersymmetric Strings

1998-10-16

arxiv.org/abs/hep-th/9810129v1

JHEP 9901:004,1999

Physics

High Energy Physics

High Energy Physics - Theory

16 pages, harvmac big

Scientific paper

10.1088/1126-6708/1999/01/004

It has recently been suggested that in certain special nonsupersymmetric type II string compactifications, at least the first two perturbative contributions to the cosmological constant $\Lambda$ vanish. Support for perturbative vanishing beyond 1-loop (as well as evidence for the absence of some nonperturbative contributions) has come from duality arguments. There was also a direct 2-loop computation which was incomplete; in this note we explain the deficiency of the previous 2-loop calculation and discuss the complete 2-loop computation in two different models. The corrected analysis yields a vanishing 2-loop contribution to $\Lambda$ in these models.

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