English

L-invariants for cohomological representations of PGL(2) over arbitrary number fields

Number Theory 2021-10-01 v1

Abstract

Let π\pi be a cuspidal, cohomological automorphic representation of an inner form GG of PGL2\mathrm{PGL}_2 over a number field FF of arbitrary signature. Further, let p\mathfrak{p} be a prime of FF such that GG is split at p\mathfrak{p} and the local component πp\pi_\mathfrak{p} of π\pi at p\mathfrak{p} is the Steinberg representation. Assuming that the representation is non-critical at p\mathfrak{p} we construct automorphic L\mathcal{L}-invariants for the representation π\pi. If the number field FF is totally real, we show that these automorphic L\mathcal{L}-invariants agree with the Fontaine-Mazur L\mathcal{L}-invariant of the associated pp-adic Galois representation. This generalizes a recent result of Spiess respectively Rosso and the first named author from the case of parallel weight 22 to arbitrary cohomological weights.

Keywords

Cite

@article{arxiv.2109.14949,
  title  = {L-invariants for cohomological representations of PGL(2) over arbitrary number fields},
  author = {Lennart Gehrmann and Maria Rosaria Pati},
  journal= {arXiv preprint arXiv:2109.14949},
  year   = {2021}
}

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21 pages