Thermalization of Color Gauge Fields in High Energy Heavy Ion Collisions

We discuss quantum mechanical decay of color magnetic field generated initially at high energy heavy ion collisions. It is caused by Nielsen-Olesen unstable modes and is accomplished possibly in a period $<1$fm/c. We show that the decay products, i.e. incoherent gluons may be thermalized in a sufficiently short period ($< 1$fm/c). The precise determination of the period is made by calculating two point function of the color magnetic field in a model of color glass condensate.Comment: 6 page

Quark Pair Production in Expanding Glasma

Glasma in high energy heavy ion collisions is longitudinal classical color electric and magnetic fields. The color electric field has been shown to produces quark and anti-quark pairs by the Schwinger mechanism and to oscillate with time in non-expanding glasma, that is, plasma oscillation. On the other hand, in the expanding glasma we show that the field decreases with the plasma oscillation. We can explicitly obtain the solutions representing such temporal behaviors in the system with $\tau$ and $\eta$ coordinates. We show these results by using massless QED as a simplified model of QCD.Comment: 8 pages, 2 figure

Vortex Excitations in α\alpha Cluster Condensed Nuclei

We point out an intriguing possibility that there exist topological soliton-like excitations in nuclei with $\alpha$ cluster condensation. The excitations are vortices in superfluid, a property possessed by such Bose condensed nuclei. We show that the vortex-like states possess quantum numbers $J^{P}=n^{(-1)^n}$ and energies $\sim$ several MeV, measured from the ground state energies of the $n \alpha$ condensed states. We point out actual candidates, for instance, $2^{+}(3 {MeV})$ for $^{8}$Be, $3^{-}(9.6 {MeV})$ for $^{12}$C, etc, although the topological nature as a vortex is obscure in such light nuclei.Comment: 6 pages, no figure