Weakly fair A_q(lambda) conjecture for the Dirac series of U(p,q)

Let U(p,q)U(p,q) be the real unitary group, with complexified Lie algebra g\mathfrak{g} and maximal compact subgroup KK. Let Aq(λ)A_{\mathfrak{q}}(\lambda) be a cohomologically induced module, and call it weakly fair when its parameter satisfies the weakly fair range condition. Let G^d\widehat{G}^{d} denote the Dirac series, namely the irreducible unitary (g,K)(\mathfrak{g},K)-modules with nonzero Dirac cohomology. Let

denote the necessary condition for nonzero Dirac cohomology given in Lemma 3.5.1 of the source. **Dirac-series conjecture.** Any Dirac series member of $U(p,q)$ must be a weakly fair $A_{\mathfrak{q}}(\lambda)$ module satisfying

.

The conjecture would constrain all irreducible unitary representations with nonzero Dirac cohomology to the weakly fair cohomologically induced setting. The source presents it after computations through U(5,5)U(5,5), but gives no resolution.

Sources & referencesView supporting material

Primary source

Chao-ping Dong and Kayue Daniel Wong, “On the Dirac Series of U(p,q)”, arXiv:2003.07165 (2020).

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