Unramifiedness and nilpotent ramification conjecture for Hilbert modular cohomology
Unramifiedness and nilpotent ramification conjecture for Hilbert modular cohomology
Let be a totally real number field of degree over and let be an arbitrary prime number. Fix a prime of lying above , and let be a paritious weight such that for all . Let denote the image of the universal tame Hecke algebra acting on
and let denote a non-Eisenstein maximal ideal of , with associated Galois representation . Let denote the universal ring for framed -deformations of , and let be the proper ideal of cutting out the locus of unramified lifts.
Unramifiedness and nilpotent ramification conjecture. The representation is unramified at , and there exists a positive integer depending on such that annihilates the -module
This is motivated by the expected properties of modular Galois representations arising from forms of weight . It predicts both unramifiedness of the residual representation at and a uniform nilpotence statement for the ramified deformation directions acting on the localized cohomology. The source does not indicate whether the conjecture has been resolved.
Sources & referencesView supporting material
Primary source
Matthew Emerton, Davide A. Reduzzi and Liang Xiao, “Unramifiedness of Galois representations arising from Hilbert modular surfaces”, arXiv:1410.6203 (2017).
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