Skew braces and Rota-Baxter operators on semi-direct product

Abstract: This paper examines the connections between (relative) Rota-Baxter groups, skew left braces, and enlargements of these structures on naturally associated semi-direct products. For any skew left brace, we introduce a new skew left brace, called the square, on the natural semi-direct product of its additive and multiplicative groups. Further, the square construction turns out to be distinct from the previously known double construction arising as a special case of matched pairs of skew braces. This provides a method to construct a new bijective, non-degenerate solution to the Yang-Baxter equation from an existing solution arising from a skew left brace. We show that the square construction is functorial and integrates naturally into both the cohomological and extension-theoretic frameworks for (relative) Rota-Baxter groups and skew left braces. Furthermore, we provide a sufficient condition under which two isoclinic skew left braces yield isoclinic squares.