Prediction for the Cosmological Constant in Resummed Quantum Gravity and Constraints on SUSY GUT's

TL;DR

This paper estimates the cosmological constant using resummed quantum gravity within Planck scale cosmology, suggesting constraints on SUSY GUT models and discussing theoretical uncertainties.

Contribution

It applies a resummed quantum gravity approach to estimate the cosmological constant and explores its implications for SUSY GUT models.

Findings

Estimated cosmological constant close to observed value

Constraints on SUSY GUT models based on the estimate

Discussion of theoretical uncertainties in the approach

Abstract

We use our resummed quantum gravity approach to Einstein's general theory of relativity in the context of the Planck scale cosmology formulation of Bonanno and Reuter to estimate the value of the cosmological constant such that \rho_\Lambda=(0.0024 eV)^4. We argue that the closeness of this estimate to experiment constrains susy GUT models. We discuss in turn various theoretical issues that have been raised about the approach itself as well as about the application to estimate the cosmological constant. Given the closeness of the estimate to the currently observed value, we also discuss the theoretical uncertainty in the estimate -- at this time, we argue it is still large.