You seem educated on some matters, so please reply here. My physics education stopped at modern physics (optics, general relativity) so I'm missing the core m

You seem educated on some matters, so please reply here. My physics education stopped at modern physics (optics, general relativity) so I'm missing the core mathematics of quantum mechanics and deeper dives into particle physics. In the actual summation, does the calculation of vacuum energy take into account a cross section of neutrinos and extended "particles". I've always found the concept of vacuum energy lacking in that most(even physicists) do not fundamentally conceptualize a permanent neutrino and elementary particle flux in all but the most astoundingly shielded vacuum. If there is a medium in which to effect the refractive index, then isnt this an interaction of the molecular structures therein?