Shapes of Milky-Way-mass galaxies with self-interacting dark matter

Self-interacting dark matter (SIDM) models offer one way to reconcile inconsistencies between observations and predictions from collisionless cold (CDM) on dwarf-galaxy scales. In order incorporate the effects of both baryonic SIDM interactions, we study a suite cosmological-baryonic simulations Milky-Way (MW)-mass galaxies Feedback in Realistic Environments (FIRE-2) project where vary self-interaction cross-section $\sigma/m$. We compare shape main (DM) halo at redshift $z=0$ predicted by (at $\sigma/m=0.1$, $1$, $10$ cm$^2$ g$^{-1}$) with CDM using same initial conditions. presence feedback effects, find that do not produce large differences inner structure MW-mass SIDM-only models. However, radius total mass distribution begins differ stellar is dependent This transition could potentially be used set limits MW.