  We present numerical results showing how our recently proposed relativistic
three-particle quantization condition can be used in practice. Using the
isotropic (generalized $s$-wave) approximation, and keeping only the leading
terms in the effective range expansion, we show how the quantization condition
can be solved numerically in a straightforward manner. In addition, we show how
the integral equations that relate the intermediate three-particle
infinite-volume scattering quantity, $\mathcal K_{\text{df},3}$, to the
physical scattering amplitude can be solved at and below threshold. We test our
methods by reproducing known analytic results for the $1/L$ expansion of the
threshold state, the volume dependence of three-particle bound-state energies,
and the Bethe-Salpeter wavefunctions for these bound states. We also find that
certain values of $\mathcal K_{\text{df},3}$ lead to unphysical finite-volume
energies, and give a preliminary analysis of these artifacts.

High Energy Physics - Lattice