10
votes
5answers
576 views
How is representation theory used in modular/automorphic forms?
There is certainly an abundance of advanced books on Galois representations and automorphic forms. What I'm wondering is more simple: What is the basic connection between modular f …
4
votes
1answer
231 views
$L$-functions for $\Theta$-lifts
Let $E/F$ be a quadratic extension of number fields. Let $W$ be a hermitian space over $E$ of dimension $2,$ and let $V$ be a skew-hermitian space of dimension $3$ over $E.$ Cons …
8
votes
3answers
452 views
Constructing coherent sheaves on Shimura varieties.
Let me first run through the setting of my question in an example I understand well; that of modular curves. If $Y_1(N)$ denotes the usual modular curve over the complexes, the quo …
5
votes
0answers
157 views
Automorphic representations attached to abelian varieties
Let $A$ be an abelian variety defined over $\mathbb{Q}$, of dimension $d$. It is widely expected that there is an automorphic representation $\pi_A$ of $GL(2d)/\mathbb{Q}$ whose L …
27
votes
6answers
1k views
What are the local Langlands conjectures nowadays, for connected reductive groups over a $p$-adic field?
Let me stress that I am only interested in $p$-adic fields in this question, for reasons that will become clear later. Let me also stress that in some sense I am basically assuming …
7
votes
1answer
263 views
Simple explicit example of local Jacquet-Langlands theorem for inner forms of GL(n), and consequences
This one will be very easy for the experts.
Let $F$ be a nonarch local field, let $n\geq1$ be an integer, choose $0\leq d<n$ and let $D$ be the central simple algebra over $F$ …
3
votes
1answer
348 views
Rallis inner product formula for U(2,2) and U(3)
Victor Tan has a couple of papers on a regularized Siegel-Weil formula for U(2,2) and U(3). The papers I'm talking about are:
"A Regularized Siegel-Weil Formula on U(2,2) and U( …
4
votes
2answers
358 views
modularity of algebraic varieties
Hello,
Are there any examples of varieties which are not Shimura varieties or abelian varieties
and whose L-functions have been shown to be a product of automorphic L-functions?
…
5
votes
3answers
526 views
p-adic L-functions
For modular forms, it is known that you can construct p-adic L-functions by interpolating (p-power conductor) twists of their associated L-functions at special values. Similarly, K …
14
votes
3answers
2k views
Where stands functoriality in 2009?
Robert Langlands is famous in number theory for making famous and deep conjectures about very abstract things called automorphic forms, somewhere in the 60s.
There's a very intere …
5
votes
2answers
268 views
Is there a canonical notion of “mod-l automorphic representation”?
As the title says.
In particular, I am interested in the story for a general reductive group $G$, say defined over $\mathbb{Q}$. I can imagine that mod-$\ell$ (algebraic) automor …
1
vote
3answers
303 views
Terminology occuring in automorphic representation and relationship between them
When one tries to read about automorphic representation few terms come up more than others namely,
1.Cuspidal
2.Square Integrable
3.Absolutely Cuspidal
4.Super Cuspidal
My und …
4
votes
1answer
266 views
extending cusp forms
Let $E/F$ be a quadratic extension of number fields, and let $V$ be an $n$-dimensional Hermitian space over $E$.
Let $\tilde{G} := GU(V)$ and $G := U(V)$. Suppose that $(\pi, V_{ …
3
votes
2answers
228 views
Conductor of monomial forms with trivial nebentypus
Is it true that the conductor of a holomoprhic or a Maass cusp form with trivial nebentypus corresponding to a two-dimensional dihedral representation (over $\mathbb{Q}$ )is non-sq …
9
votes
2answers
398 views
Overview of automorphic representations for $SL(2)/{\mathbf{Q}}$?
In short: what does Labesse-Langlands say?
Slightly more precise: what are the cuspidal automorphic representations of $SL_2(\mathbf{A}_{\mathbf{Q}})$, together with multiplicitie …

