Abstract

We analyze the behavior of unstable modes in glasma produced initially in high energy heavy ion collisions, by using a simple model of homogeneous longitudinal color electric and magnetic fields. The unstable modes can be approximately described as Nielsen-Olesen unstable modes under the homogeneous longitudinal gauge fields. We find that the NielsenOlesen unstable modes show properties very similar to those of the exponentially increasing unstable modes in glasma demonstrated recently by Romatschke and Venugopalan. We discuss why such effective weak magnetic fields used in the model are appropriate to analyze the instability of the initial strong inhomogeneous gauge fields. Our analysis indicates that the decay of the gauge fields in glasma is caused by not Weibel instability but Nielsen-Olesen instability.

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