Ram Ekstrom

My name is Ram Ekstrom and I am a fourth year PhD student at the University of Michigan. My advisor is Stephen DeBacker and I think about matters related to $p$-adic reductive groups, harmonic analysis, and Bruhat–Tits theory.

I obtained a M.Sc through the Marjorie Lee Browne Scholars Program in 2022. Before that I was an undergraduate at the University of Colorado.

Papers

Hopefully more will go here at some point.

• An interesting wild torus in $\mathrm{Sp}_4$ over a local field of equicharacteristic $2$, (forthcoming!)
• Reductive subgroups attached to points in the Bruhat–Tits building, (forthcoming!)
• A remark on commutators in parahoric subgroups, (forthcoming!)

Talks

Listed below are some of the talks that I have given in the past.

• Reductive subgroups associated to points in the Bruhat–Tits building, 2025 Fall Southeastern Sectional Meeting, Tulane University, October 2025
• Who lives in the Bruhat–Tits building?, Student NT Seminar, University of Michigan, September 2025
• Character formulas for limits of discrete series of $p$-adic $\mathrm{SL}_2$, AWS 2025, University of Arizona, March 2025
• Some facts about Bruhat–Tits theory, Student NT Seminar, University of Michigan, February 2025
• Twisting up groups, Student NT Seminar, University of Michigan, January 2025
• Shalika germs, Student NT Seminar, University of Michigan, October 2024
• Motivating endoscopy via an example with $\mathrm{SL}_2$, Student NT Seminar, University of Michigan, March 2024
• Endoscopy and the Fundamental Lemma, Student Arithmetic Seminar, University of Michigan, March 2023
• Embeddings of Bruhat–Tits buildings, MLB Colloquium, University of Michigan, April 2022

Teaching

In the summer of 2025 I was a teacher for Math Corps at U(M). I have also taught several courses at Michigan as a GSI.

• Math 105 (F24)
• Math 115 (F20, W21, F21, SU22, F23, W24)
• Math 116 (W23)
• Math 215 (F22)