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Hitchin map on even very stable upward flows

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arxiv 2303.01404 v2 pith:AHNMYDEF submitted 2023-03-02 math.AG math.DG

Hitchin map on even very stable upward flows

classification math.AG math.DG
keywords evenflowsupwardhitchinhiggsrealspacesstable
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We define even very stable Higgs bundles and study the Hitchin map restricted to their upward flows. In the GL(n) case we classify the type (1,...,1) examples, and find that they are governed by a root system formed by the roots of even height. We discuss how the spectrum of equivariant cohomology of quaternionic Grassmannians, 4n-spheres and the real Cayley plane appear to describe the Hitchin map on even cominuscule upward flows. The even upward flows in question are the same as upward flows in Higgs bundle moduli spaces for quasi-split inner real forms. The latter spaces have been pioneered by Oscar Garc\'ia-Prada and his collaborators.

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