Non-basic rigid packets for discrete $L$-parameters

TL;DR

This paper extends the theory of non-basic rigid inner forms over p-adic fields, enhancing the local Langlands correspondence by describing packets of representations for discrete L-parameters in a broader context.

Contribution

It develops the theory of non-basic rigid inner forms and extends the rigid refined local Langlands conjectures for discrete L-parameters of quasi-split groups.

Findings

Extended the classification of L-packets to non-basic inner forms.

Connected L-parameters with Weyl orbits of representations of inner forms.

Provided a framework for parametrizing representations via conjugacy classes of embeddings.

Abstract

This article introduces the theory of non-basic rigid inner forms over $p$-adic local fields, extending the basic theory developed by Kaletha. Motivated by the recent work of Bertoloni Meli--Oi on the $B(G)$-parametrization of the local Langlands conjectures, our main application is to extend the basic rigid refined local Langlands conjectures for a discrete $L$-parameter $\phi$ of a quasi-split connected reductive group $G$. The packets of our extended construction are Weyl orbits of representations of inner forms of twisted Levi subgroups $N$ of $G$ for which $\phi$ factors through a member of the canonical $\widehat{G}$-conjugacy class of embeddings $^{L}N_{\pm} \to \hspace{1mm} ^{L}G$ constructed by Kaletha.