Effective curves on $\overline{M}_{0,n}$ from group actions
  We study new effective curve classes on the moduli space of stable pointed rational curves given by the fixed loci of subgroups of the permutation group action. We compute their numerical classes and provide a strategy for writing them as effective linear combinations of F-curves, using Losev-Manin spaces and toric degeneration of curve classes. 
Han-Bom Moon, David Swinarski
math.AG