 Luxembourgian physicists

It seems there might be a misunderstanding in your question. "Luxembourgian physicists" likely refers to physicists from Luxembourg or those associated with institutions in Luxembourg. Luxembourg, though a small country, has a growing scientific community, including physicists working in various fields such as fundamental physics, material science, and applied physics. The country has institutions like the University of Luxembourg and research centers that contribute to various areas of research in physics.