Böckle–Juschka irreducible-component conjecture for framed deformation spaces

Let pp be a prime, let nn be a positive integer, let KK be a finite extension of cQpcQ_p, and let ρ:GKGLn(kL)\overline\rho:G_K\to\operatorname{GL}_n(k_L) be a continuous representation. Let Xρ\mathcal{X}^{\square}_{\overline\rho} be the rigid generic fiber of the framed deformation ring of ρ\overline\rho, and let

d:XρXdetρd:\mathcal{X}^{\square}_{\overline\rho}\to\mathcal{X}^{\square}_{\det\overline\rho}

be the map induced by sending a deformation to its determinant. Böckle–Juschka's conjecture. The map dd induces a bijection between the irreducible components of the two spaces, and the irreducible and connected components of Xρ\mathcal{X}^{\square}_{\overline\rho} coincide. This conjecture concerns the geometry of unrestricted framed local deformation spaces; the source reports that it is resolved in several special cases, including n=1n=1, certain two-dimensional cases, and cases with a vanishing adjoint cohomology group, while the general statement is left open.

Sources & referencesView supporting material

Primary source

Ashwin Iyengar, “Deformation theory of the trivial mod p Galois representation for GL_n”, arXiv:1904.05996 (2021).

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