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Evidence for Nonvanishing Cosmological Constant in NonSusy Superstring Models
High Energy Physics - Theory · Submitted 9 Dec 1999
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim $\Lambda$ is expressed as the integral over the surface moduli of an amplitude which is zero if susy is not completely broken, but we find it to be nonvanishing in the susy breaking models which can be given an explicitly workable fermionic formulation.
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We reanalyse the computation of the cosmological constant $\Lambda$ at two loops in recently proposed Superstring models without massless gravitini, both in the theta-function based formalism and by a detailed computation in the more explicit hyperelliptic description of the underlying genus two Riemann surface. $\Lambda$ is expressed as the integral over the surface moduli of an amplitude which is zero if susy is not completely broken, but we find it to be nonvanishing in the susy breaking models which can be given an explicitly workable fermionic formulation. Thus unfortunately the issue of getting realistic and perturbatively viable models from Superstring Theory remains open.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We reanalyse the computation of the cosmological constant $\Lambda$ at two loops in recently proposed Superstring models without massless gravitini, both in the theta-function based formalism and by a detailed computation in the more explicit hyperelliptic description of the underlying genus two Riemann surface. | contribution 0.83 | 0.92 | 0.05 | asserted 0.82 |
| s1 | $\Lambda$ is expressed as the integral over the surface moduli of an amplitude which is zero if susy is not completely broken, but we find it to be nonvanishing in the susy breaking models which can be given an explicitly workable fermionic formulation. | result 1.00 | 0.95 | 0.84 | asserted 1.00 |
| s2 | Thus unfortunately the issue of getting realistic and perturbatively viable models from Superstring Theory remains open. | interpretation 0.98 | 0.16 | 0.24 | asserted 0.99 |
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Original abstract
We reanalyse the computation of the cosmological constant $\Lambda$ at two loops in recently proposed Superstring models without massless gravitini, both in the theta-function based formalism and by a detailed computation in the more explicit hyperelliptic description of the underlying genus two Riemann surface. $\Lambda$ is expressed as the integral over the surface moduli of an amplitude which is zero if susy is not completely broken, but we find it to be nonvanishing in the susy breaking models which can be given an explicitly workable fermionic formulation. Thus unfortunately the issue of getting realistic and perturbatively viable models from Superstring Theory remains open.
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States a conflicting result 1 paper
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The corrected analysis yields a vanishing 2-loop contribution to $\Lambda$ in these models.
On Vanishing Two Loop Cosmological Constants in Nonsupersymmetric Strings · 0.98
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