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Chiral fermions, massless particles and Poincare covariance
(Elsevier, 2015-05-19)
The coadjoint orbit method is applied to the construction of Hamiltonian dynamics of massless particles of arbitrary helicity. The unusual transformation properties of canonical variables are interpreted in terms of nonlinear ...
Modalities for an Allegorical Conceptual Data Model
(MDPI AG, 2014)
Allegories are enriched categories generalizing a category of sets and binary relations. In this paper, we extend a new, recently-introduced conceptual data model based on allegories by adding support for modal operators ...
Weak n-Ary Relational Products in Allegories
(MDPI AG, 2014)
Allegories are enriched categories generalizing a category of sets and binary relations. Accordingly, relational products in an allegory can be viewed as a generalization of Cartesian products. There are several definitions ...