Cosmological Implications of the Quantum SU(2) Yang-Mills Fields

Abstract: We study the key properties of the quantum SU(2) Yang-Mills ground state and its possible role in the early Universe, in particular, as a driver of Cosmic Inflation. Using the effective action approach and separating the Yang-Mills field potential into homogeneous (condensate) and inhomogeneous (fluctuations) components, we reproduce the conformal-time solutions for the two different types of the Yang-Mills condensate in the minimum of the effective Lagrangian for generic initial conditions. Furthermore, the stability of these solutions has been shown in the case of small inhomogeneous fluctuations in the linearized quasiclassical approximation. Conclusions about the applicability of our solutions to description of the cosmic inflation have been made.