Supercuspidal ramifications and traces of adjoint lifts at good primes
Number Theory
2019-03-21 v3
Abstract
In this paper, we write down the local Brauer classes of the endomorphism algebras of motives attached to non-CM primitive Hecke eigenforms for all supercuspidal primes in terms of traces of adjoint lifts at auxiliary primes. We give an alternative proof of the result for odd primes obtained in [MR3391026] and write down the ramification formulas for odd unramified supercuspidal primes of level zero also removing a mild hypothesis of [MR3391026]. We also give a complete description of ramifications for . The philosophy of adjoint lifts help us to determine the local Brauer classes at non dihedral primes by using results similar to [MR2770587]. We provide some numerical examples using {Sage} and {LMFDB} supporting some of our theorems.
Keywords
Cite
@article{arxiv.1712.05623,
title = {Supercuspidal ramifications and traces of adjoint lifts at good primes},
author = {Debargha Banerjee and Tathagata Mandal},
journal= {arXiv preprint arXiv:1712.05623},
year = {2019}
}