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26 votes
Accepted

Applications of Iwasawa Theory

Aha, an excuse to quote chunks of my most recent grant proposal :-) Iwasawa theory is heavily used in work on the BSD conjecture. For instance, the first positive result to be proved in the direction …
David Loeffler's user avatar
19 votes
1 answer
2k views

Two-variable p-adic L-functions of elliptic curves

Suppose $K$ is an imaginary quadratic field (with class number 1, for simplicity), $p \ne 2$ a prime split in $K$, and $K_\infty$ the $\mathbb{Z}_p^2$-extension of $K$. If $E / \mathbb{Q}$ is an elli …
David Loeffler's user avatar
15 votes
Accepted

Why can Euler systems constructed from algebraic cycles only be anticyclotomic?

Let me explain a bit more what that footnote was supposed to mean. As I'm sure you know, an Euler system for a Galois representation $V$ over a number field $K$ consists of a bunch of classes in $H^1 …
David Loeffler's user avatar
14 votes
1 answer
982 views

P-adic L-functions of nonabelian twists of elliptic curves

Let $E$ be an elliptic curve and $\rho$ an Artin representation of $\operatorname{Gal}(\overline{\mathbb{Q}} / \mathbb{Q})$. Then there is a "twisted L-function" $L(E, \rho, s)$, corresponding to the …
David Loeffler's user avatar
13 votes
2 answers
1k views

Are Kato's zeta elements integral?

Let $E$ be an elliptic curve over $\mathbb{Q}$ and $T$ the $p$-adic Tate module of $E$. Kato's Euler system, constructed in the paper "P-adic Hodge theory and values of zeta functions of modular forms …
David Loeffler's user avatar
13 votes
Accepted

Do people prefer working on $\mathrm{GSp}$ and $\mathrm{GU}$ rather than $\mathrm{Sp}$ and $...

Symplectic case: Here are two reasons (not necessarily the only ones) why $\operatorname{GSp}_{2n}$ is more convenient to work with than $\operatorname{Sp}_{2n}$. Firstly: there is no Shimura datum w …
David Loeffler's user avatar
10 votes
Accepted

Main conjecture for elliptic curves

The main conjecture is a theorem if the image of the mod $p$ Galois representation of E is the whole of $GL_2(\mathbf{F}_p)$. The full statement of the conjecture, which implies what you wrote about l …
David Loeffler's user avatar
9 votes
0 answers
748 views

Existence of multi-variable $p$-adic $L$-functions

What's the "state of the art" in constructing multi-variable p-adic L-functions for number fields? More precisely: if K is a number field, and $K_{\infty} / K$ is an infinite Galois extension, unrami …
David Loeffler's user avatar
7 votes

Functional equations relating to p-adic L-functions

The formula you give relating $L_\alpha$ and $L_\beta$ is correct, but it is only valid for $1 \le j \le k-1$, so it only gives you finitely many values and hence it doesn't show that one L-function d …
David Loeffler's user avatar
7 votes

How is Taylor-Wiles patching "horizontal Iwasawa theory"?

I think your question already contains its own answer. In classical, "vertical" Iwasawa theory one studies class groups, or other arithetic widgets like elliptic curve Selmer groups, in a limit over $ …
David Loeffler's user avatar
6 votes
Accepted

Describing the Gamma-transform explicitly in terms of power series

This is a hard problem (and one which is easily overlooked by the unwary)! Just to be clear, I'll summarize (how I think about) the problem: as a relation between additive and multiplicative Fourier t …
David Loeffler's user avatar
5 votes
Accepted

Main conjecture for elliptic curves invariant under a $\mathbb{Q}$-isogeny

Yes, the main conjecture is isogeny-invariant. See here: B. Perrin-Riou, Variation de la fonction $L$ $p$-adique par isogénie, Algebraic number theory, Adv. Stud. Pure Math. 17 (1989), pp. 347-358.
David Loeffler's user avatar
5 votes
Accepted

What is the current status on the corank conjecture for Selmer groups?

Yes, the corank conjecture is a theorem for elliptic curves over $\mathbb{Q}$. The key to the proof is the following: Theorem (Kato, 2004): For any $E$ and any $p$, the "fine Selmer group" $Sel_p^ …
David Loeffler's user avatar
5 votes

Completed cohomology and variants

There is no reason why you shouldn't consider completed etale cohomology, instead of completed singular cohomology. If you look at Emerton's 2006 Inventiones paper which started the whole theory, he a …
David Loeffler's user avatar
4 votes
Accepted

Gouvea-Mazur conjecture

The distinction between the spaces of cusp forms and of all modular forms is not important for the Gouvea-Mazur conjecture, since it's very easy to show that the Eisenstein series vary in p-adic famil …
David Loeffler's user avatar

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