NTS ABSTRACTSpring2018: Difference between revisions
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Return to [https://www.math.wisc.edu/wiki/index.php/NTS_Spring_2018] | Return to [https://www.math.wisc.edu/wiki/index.php/NTS_Spring_2018 NTS Spring 2018 ] | ||
Revision as of 22:17, 18 December 2017
Return to NTS Spring 2018
Feb 1
| Yunqing Tang |
| Exceptional splitting of reductions of abelian surfaces with real multiplication |
| Abstract: Zywina showed that after passing to a suitable field extension, every abelian surface $A$ with real multiplication over some number field has geometrically simple reduction modulo $\frak{p}$ for a density one set of primes $\frak{p}$. One may ask whether its complement, the density zero set of primes $\frak{p}$ such that the reduction of $A$ modulo $\frak{p}$ is not geometrically simple, is infinite. Such question is analogous to the study of exceptional mod $\frak{p}$ isogeny between two elliptic curves in the recent work of Charles. In this talk, I will show that abelian surfaces over number fields with real multiplication have infinitely many non-geometrically-simple reductions. This is joint work with Ananth Shankar. |