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Dirac cohomology of cohomologically induced modules for reductive Lie groups
- American Journal of Mathematics
- Johns Hopkins University Press
- Volume 137, Number 1, February 2015
- pp. 37-60
- 10.1353/ajm.2015.0007
- Article
- Additional Information
We extend the setting and a proof of the Vogan's conjecture on Dirac
cohomology to a possibly disconnected real reductive Lie group $G$ in the
Harish-Chandra class. We show that the Dirac cohomology of cohomologically
induced module ${\mathcal L}_S(Z)$ is completely determined by the Dirac
cohomology of the inducing module $Z$. More precisely, we prove that if
$Z$ is weakly good then the Dirac cohomology $H_D({\mathcal L}_S(Z))$ is
equal to ${\mathcal
L}^{\widetilde{K}}_S(H_D(Z)\otimes\Bbb{C}_{-\rho(\frak{p}\cap\frak{u})})$.
An immediate application is a classification of tempered irreducible
unitary representations with nonzero Dirac cohomology.