Cosmological constant, renormalization group and Planck scale physics
Ilya L. Shapiro, Joan Sola
Abstract
Starting from generic quantum effects at the Planck scale MP, we find that the renormalization group running of the cosmological constant (CC) at low energies is possible if there is a smooth decoupling of all massive particles from MP to the mass of the lightest neutrino. We discuss the theoretical implications of this running for the ``old'' and ``new'' cosmological constant problems. Interestingly enough, the CC running implies a strong relationship between quantum field theory and cosmology, which should be observable in the near future in experiments such as SNAP through the measurement of a cubic redshift dependence of the CC.
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