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Interstellar dust plays decisive roles in the conversion of neutral tomolecular hydrogen (H_2), the thermodynamical evolution of interstellar medium(ISM), and the modification of spectral energy distributions (SEDs) ofgalaxies. These important roles of dust have not been self-consistentlyincluded in previous numerical simulations of galaxy formation and evolution.We have therefore developed a new model by which one can investigate whetherand how galaxy formation and evolution can be influenced by dust-relatedphysical processes such as photo-electric heating, H_2 formation on dust, andstellar radiation pressure on dust in detail. A novel point of the model isthat different dust species in a galaxy are represented by `live dust'particles (i.e., not test particles). Therefore, dust particles in a galaxy notonly interact gravitationally with all four components of the galaxy (i.e.,dark matter, stars, gas, and dust) but also are grown and destroyed throughphysical processes of ISM. First we describe a way to include dust-relatedphysical processes in Nbody+hydrodynamical simulations of galaxy evolution indetail. Then we show some preliminary results of dust-regulated galaxyevolution. The preliminary results suggest that the evolution of dustdistributions driven by radiation pressure of stars is very important for theevolution of star formation rates, chemical abundances, H_2 fractions, and gasdistributions in galaxies.

Dust-regulated galaxy formation and evolution:A new chemodynamical model with live dust particles