 potential
energy (ridges in log posteriors correspond to valleys in potential
energy). In practice, even with a random momentum for <span class="math inline">\(\lambda_1\)</span> and
<span class="math inline">\(\lambda_2\)</span>, the gradient of the log posterior is going to adjust for
the correlation and the simulation will run <span class="math inline">\(\lambda_1\)</span> and
<span class="math inline">\(\lambda_2\)</span> in opposite directions along the valley corresponding to
the ridge in the posteri