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Published January 24, 2020 | Submitted
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Invariant random subgroups of semidirect products

Abstract

We study invariant random subgroups (IRSs) of semidirect products G = A⋊Γ. In particular, we characterize all IRSs of parabolic subgroups of SL_d(R), and show that all ergodic IRSs of R^d⋊SL_d(R) are either of the form R^d⋊K for some IRS of SL_d(R), or are induced from IRSs of Λ⋊SL(Λ), where Λ < R^d is a lattice.

Additional Information

Supported in part by NSF grant DMS-1611851 and CAREER Award DMS-1654114. Supported in part by NSF grant DMS-0968762, NSF CAREER Award DMS-0954606 and BSF grant 2008274. This work was supported by a grant from the Simons Foundation (#419427, Omer Tamuz).

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Created:
August 19, 2023
Modified:
October 19, 2023