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.
References
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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