The Casimir on the $K$-fixed tensor square of the minimal representation of $G_{2(2)}$

We compute the quadratic Casimir on the $K$-fixed subspace of the Hilbert tensor square of the unitary minimal representation of the split real group $G_{2(2)}$. In an explicit algebraic basis of invariant tensors, the Casimir acts by a three-term recurrence. Normalizing this basis yields a symmetric Jacobi operator whose self-adjoint realization is unitarily equivalent to multiplication by $-\frac{9}{2}-8x^2$ in a Wilson-polynomial model with parameters $(\frac{3}{4},\frac{3}{4},\frac{7}{12},\frac{11}{12})$. We give the normalized spectral density and the unitary transform. The resulting spectrum is purely absolutely continuous, equals $(-\mathrm{\infty },-\frac{9}{2}]$, and has scalar spectral multiplicity one.