Geodesic
A characterization of finite étale morphisms in tensor triangular geometry
Épijournal de Géométrie Algébrique, Tome 6 (2022)

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We provide a characterization of finite étale morphisms in tensor triangular geometry. They are precisely those functors which have a conservative right adjoint, satisfy Grothendieck–Neeman duality, and for which the relative dualizing object is trivial (via a canonically-defined map). 
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     author = {Sanders, Beren},
     title = {A characterization of finite \'etale morphisms in tensor triangular geometry},
     journal = {\'Epijournal de G\'eom\'etrie Alg\'ebrique},
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     url = {http://geodesic.mathdoc.fr/articles/10.46298/epiga.2022.volume6.7641/}
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Sanders, Beren. A characterization of finite étale morphisms in tensor triangular geometry. Épijournal de Géométrie Algébrique, Tome 6 (2022). doi: 10.46298/epiga.2022.volume6.7641

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