We define and study the global Okounkov moment cone of a projective spherical variety X, generalizing both the global Okounkov body and the moment body of X defined by Kaveh and Khovanskii. Under mild assumptions on X we show that the global Okounkov moment cone of X is rational polyhedral. As a consequence, also the global Okounkov body of X, with respect to a particular valuation, is rational polyhedral.
On global Okounkov bodies of spherical varieties / Pezzini, G; Seppanen, H. - In: JOURNAL OF LIE THEORY. - ISSN 0949-5932. - 29:4(2019), pp. 1031-1044.
On global Okounkov bodies of spherical varieties
Pezzini, G
;
2019
Abstract
We define and study the global Okounkov moment cone of a projective spherical variety X, generalizing both the global Okounkov body and the moment body of X defined by Kaveh and Khovanskii. Under mild assumptions on X we show that the global Okounkov moment cone of X is rational polyhedral. As a consequence, also the global Okounkov body of X, with respect to a particular valuation, is rational polyhedral.File allegati a questo prodotto
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