Solutions of the reflection equation for the image vertex model Original Research Article

We investigate the possible regular solutions of the boundary Yang–Baxter equation for the fundamental image vertex model. We find four distinct classes of reflection matrices such that half of them are diagonal while the other half are non-diagonal. The latter are parameterized by two continuous parameters but only one solution has all entries non-null. The non-diagonal solutions do not reduce to diagonal ones at any special limit of the free-parameters.