
It is argued that classical string solutions should not be fine tuned to have a positive cosmological constant (CC) at the observed size, since even the quantum corrections from standard model effects will completely negate any classical string theory solution with such a CC. In fact it is even possible that there is no need at all for any ad hoc uplifting term in the potential since these quantum effects may well take care of this. Correspondingly any calculation of the parameters of the MSSM has to be rethought to take into account the evolution of the CC. This considerably complicates the issue since the initial conditions for RG evolution of these parameters are determined by the final condition on the CC! The Anthropic Principle is of no help in addressing these issues.
Added equation (20) clarifying usual assumption behind calculations of soft terms. Version published in PLB
Renormalization group methods applied to problems in quantum field theory, High Energy Physics - Theory, positive cosmological constant, High Energy Physics - Theory (hep-th), classical string solutions, FOS: Physical sciences, String and superstring theories in gravitational theory, String and superstring theories; other extended objects (e.g., branes) in quantum field theory
Renormalization group methods applied to problems in quantum field theory, High Energy Physics - Theory, positive cosmological constant, High Energy Physics - Theory (hep-th), classical string solutions, FOS: Physical sciences, String and superstring theories in gravitational theory, String and superstring theories; other extended objects (e.g., branes) in quantum field theory
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