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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
2 votes

On Kato's proof that Iwasawa Cohomology is free

(1) No, it depends on the maximal ideal (maximal ideals of $\Lambda$ biject with mod $p$ characters of $\Gamma$). (2) no longer makes sense. (3) It would suffice (for this particular step of Kato's pr …
David Loeffler's user avatar
4 votes
Accepted

State of the art on the main conjecture for supersingular elliptic curves/modular forms

Theorem (Xin Wan): If $E$ is an elliptic curve of square-free conductor $N$, and $p \ge 3$ is a prime such that $p \nmid N$ and $a_p(E) = 0$, then Kobayashi's $\pm$ Iwasawa main conjectures are tr …
David Loeffler's user avatar
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
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
2 votes
Accepted

Adjoint Selmer groups and Deformation rings

As far as I know, it is difficult to extract much information about the adjoint Selmer group over the cyclotomic $\mathbb{Z}_p$-extension. If the modular form $f$ corresponding to $\rho$ is ordinary a …
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
4 votes

Herbrand-Ribet and Mazur-Wiles for function fields

(I was hoping somebody else would answer this, because function fields are not really my area and I hoped I would learn something from the answer; but nobody seems to be biting, so...) Iwasawa theory …
David Loeffler's user avatar
4 votes

Iwasawa theory and perfectoid spaces

A flippant response is that people had the idea of using perfectoid theory in Iwasawa theory long before perfectoid theory even existed. What I'm referring to here is the work of Fontaine--Wintenberge …
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
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
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

Integration against Eisenstein series can be regarded as a cup product

Yes, that does indeed sound like something I might have said :) I was referring to some extremely powerful theorems, originally due to Michael Harris, which show that: The cohomology groups of automo …
David Loeffler's user avatar

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