Conjecture B on curvewise bounded ramification and logarithmic conductors
Conjecture B on curvewise bounded ramification and logarithmic conductors
Keep the hypotheses of Conjecture A: is perfect, is normal, is a -smooth open immersion with complement supporting an effective Cartier divisor, is an effective Cartier divisor supported on , and is a smooth -adic sheaf of finite rank on . Say that the ramification of is bounded by if, for every , the divisor on the normalisation is at most , and write this as . Conjecture B. The following are equivalent:
- .
- For every open immersion over such that is a simple normal crossing divisor, and every morphism extending , one has
for each generic point . This gives an intrinsic logarithmic-conductor criterion equivalent to detecting bounded ramification on all curves, and is presented as a conjectural extension of the rank-one theory; the source does not specify its resolution status.
Sources & referencesView supporting material
Primary source
Ivan Barrientos, “Log ramification via curves in rank 1”, arXiv:1307.5814 (2016).
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