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Congruence modules in higher codimension and zeta lines in Galois cohomology
Srikanth B Iyengar1, Chandrashekhar B Khare2, Jeffrey Manning3
1Department of Mathematics, University of Utah, Salt Lake City, UT 84112.
Abstract:
This article builds on recent work of the first three authors where a notion of congruence modules in higher codimension is introduced. The main results are a criterion for detecting regularity of local rings in terms of congruence modules, and a more refined version of a result tracking the change of congruence modules under deformation. Number theoretic applications include the construction of canonical lines in certain Galois cohomology groups arising from adjoint motives of Hilbert modular forms.
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