The small surface oscillations of the gluon tube: The elongated bag

We investigate surface oscillations on a bag tube, inside of which is spanned a longitudinal color electric field, and calculate the masses for such vibrations conceived of as quasi-particles on the string. This represents the bag tube for several suggestive values of the parameters in the bag model. Contrary to similar calculations by Vladimirsky, we consider the case where there is a surface tension and we consider higher than zero angular momentum modes. The nonzero angular momentum modes have zero mass in the case of zero surface tension (when higher quantum corrections are ignored). Our considerations point towards the surface tension not being zero. (orig.)