Baryon Interactions from QCD on Lattice

We introduce a method (HAL QCD method) to study a few-baryon system in lattice quantum chromodynamics (QCD). In this method, we can derive the potential of baryon-baryon interactions from QCD. By applying the extracted potentials, we can attack any multi-baryon system including nuclei, hypernuclei, and infinite baryonic matter, such as the neutron star core, based on QCD. After showing a few extracted potentials, we present one result of the application of QCD-extracted hyperon forces.