Domain walls in supersymmetric QCD: The taming of the zoo

We provide a unified picture of the domain wall spectrum in supersymmetric QCD with N_c colors and N_f flavors of quarks in the (anti) fundamental representation. Within the framework of the Veneziano-Yankielowicz-Taylor effective Lagrangian, we consider domain walls connecting chiral symmetry breaking vacua, and we take the quark masses to be degenerate. For N_f/N_c<1/2, there is one BPS saturated domain wall for any value of the quark mass m. For 1/2<~N_f/N_c<1 there are two critical masses m_* and m_** which depend on the number of colors and flavors only through the ratio N_f/N_c. If m<m_*, there are two BPS walls; if m_*<m<m_**, there is one non-BPS wall; and if m>m_**, there is no domain wall. We numerically determine m_* and m_** as a function of N_f/N_c, and we find that m_** approaches a constant value in the limit that this ratio goes to 1.