Fig. 5

Effective potential related to the massless scalar shell for \(\mathcal {L}=5.5\) (left plot) and \(\mathcal {L}=8\) (right plot) by varying \(\mathcal {M}\text{ }_+\) with \(\mathcal {M}\text{ }_-=0,\mathcal {J}=0.2,\mathcal {B}=1,\lambda =1.\).