We present an analytic study of the physics of the glasma which is a strongclassical gluon field created at early stage of high-energy heavy-ioncollisions. Our analysis is based on the picture that the glasma just after thecollision is made of color electric and magnetic flux tubes extending in thelongitudinal direction with their diameters of the order of 1/Q_s (Q_s is thesaturation scale of the colliding nuclei). We find that both the electric andmagnetic flux tubes expand outwards and the field strength inside the flux tubedecays rapidly in time. Next we investigate whether there exist instabilitiesagainst small rapidity-dependent perturbations for a fixed color configuration.We find that the magnetic background field exhibits an instability induced bythe fluctuations in the lowest Landau level, and it grows in the time scale of1/Q_s. For the electric background field we find no apparent instability whilethe possible relation to the Schwinger mechanism for particle pair creations issuggested.
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