The slope-invariant of local ghost series under direct sum
Number Theory
2022-07-26 v1
Abstract
The ghost conjecture is first provided by Bergdall and Pollack in [BP-1,BP-2] to study the Up-slopes of spaces of modular forms, which, so far, has already brought plenty of important results. The local version of this conjecture under genericity condition has been solved by Liu-Truong-Xiao-Zhao in [LTXZ-1, LTXZ-2]. In the current paper, we prove a necessary and sufficient condition for a sequence of local ghost series to satisfy that their product has the same Newton polygon to the ghost series build from the direct sum of their associated modules. That answers a common question asked in both [BP2,LTXZ-1].
Cite
@article{arxiv.2207.12145,
title = {The slope-invariant of local ghost series under direct sum},
author = {Rufei Ren},
journal= {arXiv preprint arXiv:2207.12145},
year = {2022}
}