arXiv subjects

Shiv Prakash Patel

Publications and source records attributed to Shiv Prakash Patel.

11 recordsLinked to original sources

arXiv2025

Distinguished representations for $\rm{SL}(n,F)$

Let $F$ be a finite field, and let $\mathbb{E}$ be either a quadratic field extension $E/F$ or the split algebra $F \oplus F$. We study distinguished representations of $\rm{SL}_{2n}(F)$ by the subgroup $H_{\flat} := \rm{SL}_{2n}(F) \cap \rm{GL}_{n}(\mathbb{E})$, which is a variation of the work of Anandavardhanan and Prasad on distinguished representations of $\rm{SL}_{n}(\mathbb{E})$ by the subgroup $\rm{SL}_n(F)$. This is in a similar framework of our earlier work of a $p$-adic non-split variation of Anandavardhanan-Prasad over finite fields. We give a formula for the dimension of the complex vector space $\rm{Hom}_{H_{\flat}}(π_{\flat}, 1)$ in terms of certain characters of $F^{\times}$, where $π_{\flat}$ is an irreducible representation which is also distinguished by $H_{\flat}$.

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arXiv2025

On the Degenerate Whittaker space for some induced representations of ${\rm GL}_4(\mathfrak{o}_2)$

Let $\mathfrak{o}_l$ be a finite principal ideal local ring of length $l$. The degenerate Whittaker space associated with a representation of ${\rm GL}_{2n}(\mathfrak{o}_l)$ is a representation of ${\rm GL}_n(\mathfrak{o}_l)$. For strongly cuspidal representations of ${\rm GL}_{2n}(\mathfrak{o}_l)$ the structure of degenerate Whittaker space is described by Prasad's conjecture, which has been proven for ${\rm GL}_4(\mathfrak{o}_2)$. In this paper, we describe the degenerate Whittaker space for certain induced representations of ${\rm GL}_4(\mathfrak{o}_2)$, specifically those induced from subgroups analogous to the maximal parabolic subgroups of ${\rm GL}_4(\mathbb{F}_q)$.

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arXiv2025

Distinguished Representations for $\rm{SL}_n(D)$ where $D$ is a quaternion division algebra over a $p$-adic field

Let $D$ be a quaternion division algebra over a non-archimedean local field $F$ of characteristic zero. Let $E/F$ be a quadratic extension and $\rm{SL}_{n}^{*}(E) = {\rm{GL}}_{n}(E) \cap \rm{SL}_{n}(D)$. We study distinguished representations of $\rm{SL}_{n}(D)$ by the subgroup $\rm{SL}_{n}^{*}(E)$. Let $π$ be an irreducible admissible representation of $\rm{SL}_{n}(D)$ which is distinguished by $\rm{SL}_{n}^{*}(E)$. We give a multiplicity formula, i.e. a formula for the dimension of the $\mathbb{C}$-vector space ${\rm{Hom}}_{\rm{SL}_{n}^{*}(E)} (π, \mathbbm{1})$, where $\mathbbm{1}$ denotes the trivial representation of $\rm{SL}_{n}^{*}(E)$. This work is a non-split inner form analog of a work by Anandavardhanan-Prasad which gives a multiplicity formula for $\rm{SL}_{n}(F)$-distinguished irreducible admissible representation of $\rm{SL}_{n}(E)$.

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arXiv2024

On degenerate Whittaker space for $GL_4(\mathfrak{o}_2)$

Let $\mathfrak{o}_2$ be a finite principal ideal local ring of length 2. For a representation $π$ of $GL_{4}(\mathfrak{o}_2)$, the degenerate Whittaker space $π_{N, ψ}$ is a representation of $GL_2(\mathfrak{o}_2)$. We describe $π_{N, ψ}$ explicitly for an irreducible strongly cuspidal representation $π$ of $GL_4(\mathfrak{o}_2)$. This description verifies a special case of a conjecture of Prasad. We also prove that $π_{N, ψ}$ is a multiplicity free representation.

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arXiv2019

A multiplicity one theorem for groups of type $A_n$ over discrete valuation rings

Let $\mathfrak{o}$ be the ring of integers of a non-archimedean local field with the maximal ideal $\wp$ and the finite residue field of characteristic $p.$ Let $\mathbf{G}$ be the General Linear or Special Linear group with entries from the finite quotients $\mathfrak{o}/\wp^\ell$ of $\mathfrak{o}$ and $\mathbf{U}$ be the subgroup of $\mathbf{G}$ consisting of upper triangular unipotent matrices. We prove that the induced representation $\mathrm{Ind}^{\mathbf{G}}_{\mathbf{U}}(θ)$ of $\mathbf{G}$ obtained from a ${\it non-degenerate}$ character $θ$ of $\mathbf{U}$ is multiplicity free for all $\ell \geq 2.$ This is analogous to the multiplicity one theorem regarding Gelfand-Graev representation for the finite Chevalley groups. We prove that for many cases the regular representations of $\mathbf{G}$ are characterized by the property that these are the constituents of the induced representation $\mathrm{Ind}^{\mathbf{G}}_{\mathbf{U}}(θ)$ for some non-degenerate character $θ$ of $\mathbf{U}$. We use this to prove that the restriction of a regular representation of General Linear groups over $\mathfrak{O}/\wp^\ell$ to the Special Linear groups is multiplicity free for all $\ell \geq 2$ and also obtain the corresponding branching rules in many cases.

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arXiv2017

Restriction of representations of metaplectic $GL_{2}(F)$ to tori

Let $F$ be a non-Archimedean local field. We study the restriction of an irreducible admissible genuine representations of the two fold metaplectic cover $\widetilde{GL}_{2}(F)$ of $GL_{2}(F)$ to the inverse image in $\widetilde{GL}_{2}(F)$ of a maximal torus in $GL_{2}(F)$.

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arXiv2015

Branching laws for the metaplectic cover of ${\rm GL}_{2}$

Let $F$ be a non-Archimedian local field of characteristic zero and $E/F$ a quadratic extension. The aim of the present article is to study the multiplicity of an irreducible admissible representation of ${\rm GL}_2(F)$ occurring in an irreducible admissible genuine representation of non-trivial two fold covering $\widetilde{\rm GL}_2(E)$ of ${\rm GL}_2(E)$.

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arXiv2014

Branching laws on the metaplectic cover of ${\rm GL}_{2}$

Representation theory of $p$-adic groups naturally comes in the study of automorphic forms and one way to understand representations of a group is by restricting to its nice subgroups. D. Prasad studied the restriction for pairs $({\rm GL}_{2}(E), {\rm GL}_{2}(F))$ and $({\rm GL}_{2}(E), D_{F}^{\times})$ where $E/F$ is a quadratic equation and $D_{F}$ is the unique quaternion division algebra, and $D_{F}^{\times} \hookrightarrow {\rm GL}_{2}(E)$. Prasad proved a multiplicity one result and a `dichotomy' relating the restriction for the pairs $({\rm GL}_{2}(E), {\rm GL}_{2}(F))$ and $({\rm GL}_{2}(E), D_{F}^{\times})$ involving the Jacquet-Langlands correspondence. We study a restriction problem involving covering groups. In an analogy to the case of Prasad, we consider pairs $(\widetilde{{\rm GL}_{2}(E)}, {\rm GL}_{2}(F))$ and $(\widetilde{{\rm GL}_{2}(E)}, D_{F}^{\times})$ where $\widetilde{{\rm GL}_{2}(E)}$ is the $\mathbb{C}^{\times}$-metaplectic covering of ${\rm GL}_{2}(E)$. We do not have multiplicity one in this case but there is an analogue of dichotomy.

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arXiv2014

A question on splitting of metaplectic covers

Let $E/F$ be a quadratic extension of a non-Archimedian local field. Splitting of the 2-fold metaplectic cover of ${\rm Sp}_{2n}(F)$ when restricted to various subgroups of ${\rm Sp}_{2n}(F)$ plays an important role in application of the Weil representation of the metaplectic group. In this paper we prove the splitting of the metaplectic cover of ${\rm GL}_{2}(E)$ over the subgroups ${\rm GL}_{2}(F)$ and $D_{F}^{\times}$, where $D_{F}$ is the quaternion division algebra with center $F$, as a first step in our study of the restriction of representations of metaplectic cover of ${\rm GL}_{2}(E)$ to ${\rm GL}_{2}(F)$ and $D_{F}^{\times}$. These results were suggested to the author by Professor Dipendra Prasad.

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arXiv2014

Multiplicity formula for restriction of representations of $\widetilde{\rm GL}_{2}(E)$ to $\widetilde{\rm SL}_{2}(E)$

In this note we prove a certain multiplicity formula regarding the restriction of an irreducible admissible genuine representation of a 2-fold cover $\widetilde{\rm GL}_{2}(E)$ of ${\rm GL}_{2}(E)$ to the 2-fold cover $\widetilde{\rm SL}_{2}(E)$ of ${\rm SL}_{2}(E)$, and find in particular that this multiplicity may not be one, a result that seems to have been noticed before. The proofs follow the standard path via Waldspurger's analysis of theta correspondence between $\widetilde{\rm SL}_{2}(E)$ and ${\rm PGL}_{2}(E)$.

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arXiv2014

A theorem of Mœglin-Waldspurger for covering groups

Let $E$ be a non-Archimedian local field of characteristic zero and residue characteristic $p$. Let ${\bf G}$ be a connected reductive group defined over $E$ and $π$ an irreducible admissible representation of $G={\bf G}(E)$. A result of C. Mœglin and J.-L. Waldspurger (for $p \neq 2$) and S. Varma (for $p=2$) states that the leading coefficient in the character expansion of $π$ at the identity element of ${\bf G}(E)$ gives the dimension of a certain space of degenerate Whittaker forms. In this paper we generalize this result of Mœglin-Waldspurger to the setting of covering groups $\tilde{G}$ of $G$.

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