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I'm a postdoc fellow at CIRGET based at UQAM (during 2024.9-2026.1 and 2026.6-), mentored by Steven Boyer and Duncan McCoy. Currently I'm an SLMath postdoc fellow (2026.1-2026.5), mentored by Saul Schleimer.
I completed my PhD at University at Buffalo in 2024. My thesis advisor is Xingru Zhang. Here is my CV.
I'm interested in the topics related to left orderable 3-manifold groups, taut foliations and pseudo-Anosov flows of 3-manifolds.
Contact information: bjzhaotopology@gmail.com.
Please note that my previous email address (bojunzha@buffalo.edu) is no longer valid. If you are unable to reach me there, please feel free to contact me at my new address.
My research
(Joint with Hyungryul Baik and Chenxi Wu) Reconstruction of Anosov flows from infinity, preprint (2024), available at https://arxiv.org/abs/2407.07634.
Co-orientable taut foliations in Dehn fillings of pseudo-Anosov mapping tori with co-orientation-reversing monodromy, Advances in Mathematics, 492 (2026): 110889. https://doi.org/10.1016/j.aim.2026.110889
Here are some examples of mapping tori with co-orientation-reversion monodromy (data from Nathan Dunfield). See here for more information.
Left orderability and taut foliations with orderable cataclysm, Mathematical Research Letters, Volume 32 (2025) Number 3. https://doi.org/10.4310/MRL.250731180608
Left orderability and taut foliations with one-sided branching, Comment. Math. Helv., online published (2025). https://doi.org/10.4171/cmh/602.
Here is a Pre-recording lightning talk for this work in Tech Topology Conference (2022).
Left orderability, foliations, and transverse (π_1, R) structures for 3-manifolds with sphere boundary, preprint (2021), available at https://arxiv.org/abs/2107.09272.
Extensions of immersions of surfaces into R^3, preprint (2019), available at https://arxiv.org/abs/1906.04294.
The extending surfaces of immersions into surfaces, preprint (2018), available at https://arxiv.org/abs/1812.06245.
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