To this day, a hundred and fifty years after Mendeleev's discovery, the overal structure of the periodic system remains unaccounted for in quantum-mechanical terms. Given this dire situation, a handful of scientists in the 1970s embarked on a quest for the symmetries that lie hidden in the periodic table. Their goal was to explain the table's structure in group-theoretical terms. We argue that this symmetry program required an important paradigm shift in the understanding of the nature of chemical elements. The (...) idea, in essence, consisted of treating the chemical elements, not as particles, but as states of a superparticle. We show that the inspiration for this came from elementary particle physics, and in particular from Heisenberg's suggestion to treat the proton and neutron as different states of the nucleon. We provide a careful study of Heisenberg's last paper on the nature of elementary particles, and explain why the Democritean picture of matter no longer applied in modern physics and a Platonic symmetry-based picture was called for instead. We show how Heisenberg's Platonic philosophy came to dominate the field of elementary particle physics, and how it found its culmination point in Gell-Mann's classification of the hadrons in the eightfold way. We argue that it was the success of Heisenberg's approach in elementary particle physics that sparked the group-theoretical approach to the periodic table. We explain how it was applied to the set of chemical elements via a critical examination of the work of the Russian mathematician Abram Ilyich Fet the Turkish-American physicist Asim Orhan Barut, before giving some final reflections. (shrink)

Symmetry is at the heart of our understanding of matter. This book tells the fascinating story of the constituents of matter from a common symmetry perspective. The standard model of elementary particles and the periodic table of chemical elements have the common goal to bring order in the bewildering chaos of the constituents of matter. Their success relies on the presence of fundamental symmetries in their core. -/- The purpose of Shattered Symmetry is to share the admiration for the power (...) and the beauty of these symmetries. The reader is taken on a journey from the basic geometric symmetry group of a circle to the sublime dynamic symmetries that govern the motions of the particles. Along the way the theory of symmetry groups is gradually introduced with special emphasis on its use as a classification tool and its graphical representations. This is applied to the unitary symmetry of the eightfold way of quarks, and to the four-dimensional symmetry of the hydrogen atom. The final challenge is to open up the structure of Mendeleev's table which goes beyond the symmetry of the hydrogen atom. Breaking this symmetry to accommodate the multi-electron atoms requires us to leave the common ground of linear algebras and explore the potential of non-linearity. (shrink)

This chapter is on when and how formalization and model building contribute to theory construction in methodological individualism. It shows that formalization is not always needed but can sometimes be useful for making assumptions explicit and for deriving implications that would appear out of reach of, or even go counter to, informal reasoning. The chapter focuses on examples from different theoretical approaches and research fields, including meanwhile ‘classic’ as well as more recent contributions. We sketch both insights that do not (...) require elaborate formalization as well as implications that do require some degree of formalization. The exposition itself is largely informal. (shrink)

Research has shown high levels of housing precarity among government-assisted refugees connected to difficult housing markets, limited social benefits, and other social and structural barriers to positive settlement. The COVID-19 pandemic has likely exacerbated this precarity. Research to date demonstrates the negative consequences of the COVID-19 pandemic for refugees and low-income households, including both health-related issues and economic challenges, that may exacerbate their ability to obtain affordable, suitable housing. In this context, we examined Syrian government-assisted refugees’ experiences during the pandemic, (...) asking: how the COVID-19 pandemic has impacted Syrian refugees’ experiences of housing stability. To examine this issue, we interviewed 38 families in Calgary, London, and Fredericton. Using a qualitative descriptive methodology for analysis and interpretation, we found the liminality of settling as a GAR has been compounded by isolation, further economic loss, and new anxieties during the pandemic. Ultimately, for many participants, the pandemic has thwarted their housing stability goals and decreased their likelihood of improving their housing conditions. Based on our findings, we discuss potential policy and practice relevant solutions to the challenges faced by refugees in Canada during the pandemic and likely beyond. (shrink)

The work of Arnout Geulincx (1624?1669), a Flemish Cartesian that developed a highly curious ?parallelistic? view on the universe, shows striking prima facie resemblances to Stoicism. Should we label Geulincx a reinventor of Stoic tenets, albeit within a strict Cartesian theoretical framework? To answer this question, my contribution begins by discussing relevant aspects of Stoicism and by introducing the ?existential? philosophy of Geulincx, whose metaphysical views on man brought him to adopt an ethics based upon absolute obedience and humility. (...) It will discuss Geulincx's own views on the Stoics and, finally, compare Geulincx's philosophy with the Stoic world view. The main argument will be that, despite a deep affinity and many parallels, one crucial difference remains, as the dualism any true Cartesian metaphysics implies has important consequences for Geulincx's ethics in general and for his view on man in particular. As we will see, man plays a very peculiar role in the cosmic drama that we call the ?universe? (shrink)