Schubert Curves in the Orthogonal Grassmannian

We develop a combinatorial rule to compute the real geometry of type B Schubert curves S(lambda(center dot)) in the orthogonal Grassmannian OG(n , C2n+1) , which are one-dimensional Schubert problems defined with respect to orthogonal flags osculating the rational normal curve. Our results are natural analogs of results previously known only in type A [J. Algebraic Combin. 45(1), 191-243 (2017)]. First, using the type B Wronski map studied in [Adv. Math. 224(3), 827-862 (2010)], we show that the real locus of the Schubert curve has a natural covering map to RP1 , with monodromy operator omega defined as the commutator of jeu de taquin rectification and promotion on skew shifted semistandard tableaux. We then introduce two different algorithms to compute omega without rectifying the skew tableau. The first uses the crystal oper-ators introduced in [Algebr. Comb. 3(3), 693-725 (2020)], while the second uses local switches much like jeu de taquin. The switching algorithm further computes the K-theory coefficient of the Schubert curve: its nonadjacent switches precisely enu-merate Pechenik and Yong's shifted genomic tableaux. The connection to K-theory also gives rise to a partial understanding of the complex geometry of these curves.