Evolution of non-spherical porous dust grains in galaxies

Recent research has examined the evolution of interstellar dust grain size distribution over time scales of up to 10 Gyr, focusing on the primary grain growth and destruction mechanisms present in both the diffuse and dense interstellar medium. The grains were modeled as porous spheres, and for the first time, the porosity was considered to depend on the particle size and time. In this work, it is proposed in the first approximation that non-spherical dust grains have a comparable mass distribution to that of spherical ones. The use of porous spheroids facilitates the calculation of the time evolution of both the interstellar polarization curve and the interstellar extinction curve. As the polarization curve is known to be a critical test for porous dust grain models, the results obtained for spheroids are important for a further understanding of the dust grain evolution in galaxies.