Heuristics for lambda Invariants

JOINT IAS/PU NUMBER THEORY SEMINAR
Topic:Heuristics for lambda Invariants
Speaker:Sonal Jain
Affiliation:New York University
Date:Thursday, February 17
Time/Room:4:30pm - 5:30pm/S-101
Video Link:https://video.ias.edu/nt/jain

The $\lambda$-invariant is an invariant of an imaginary quadratic field that measures the growth of class numbers in cyclotomic towers over the field. It also measures the number of zeroes of an associated $p$-adic L-function. In this talk, I will discuss the following question: How often is the p-adic $\lambda$-invariant of an imaginary quadratic field equal to $m$? I'll explain how one can model this question by statistics of $p$-adic random matrices, and show one can test this model by computing $\lambda$-invariants rapidly. This is joint work with Jordan Ellenberg and Akshay Venkatesh.