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Abelian varieties are projective algebraic varieties endowed with an Abelian group structure. Over the complex numbers, they can be described as quotients of a vector space by a lattice of full rank. They are analogs in higher dimensions of elliptic curves, and play an important role in algebraic geometry and number theory.

12 votes
0 answers
586 views

What is known about abelian varieties with several principal polarizations?

Let ``the simple case" be when the polarized abelian variety does not break up into a product of polarized abelian varieties. I am trying to get an idea of what is known about abelian varieties with …
Catherine Ray's user avatar
9 votes
1 answer
377 views

What is the essential image of $AbVar$ in $p-div$?

Given an abelian variety $A$ over a base scheme $\text{Spec } \mathcal{O}_{K_p}$, we define the functor $P$ as taking $A \mapsto \text{colim}_n A[p^n]$, its associated $p$-divisible group. What is the …
Catherine Ray's user avatar
5 votes
1 answer
622 views

What is the maximal order of the automorphism group of a given Shimura variety?

Background: Given an elliptic curve $E$, it seems that $max(ord(Aut(E)))$ over the prime 2 is 24, and $(max(ord(Aut(E)))$ over the prime 3 is 12. The endomorphism algebra of an elliptic curve over …
Catherine Ray's user avatar
10 votes
1 answer
842 views

How to compute the formal group law of a Shimura variety (using its invariant differentials)?

I have a 3 dimensional abelian variety whose formal group law breaks into a formal summand where one of the pieces is one-dimensional. I am desperately wondering how to compute the $p$-series of thi …
Catherine Ray's user avatar
13 votes
0 answers
345 views

An example of curves with the same Jacobian, but different Jacobian automorphism groups (wrt...

I am trying to understand examples of differing curves with the same Jacobian, and the quirks of the Jacobian. Here is my question: What is an example where $Aut(Jac(X, a))$ and $Aut(Jac(X', a'))$ d …
Catherine Ray's user avatar