Seminar Event Detail

Dissertation Defense

Date:  Wednesday, May 25, 2022
Location:  2866 East Hall (2:00 PM to 4:00 PM)

Title:  G a-perf-mules and de Rham cohomology

Abstract:   In this thesis, we prove that algebraic de Rham cohomology as a functor defined on smooth F_p-algebras is formally \'etale in a precise sense. This result shows that given de Rham cohomology, one automatically obtains the theory of crystalline cohomology as its \textit{unique} functorial deformation. To prove this, we define and study the notion of a pointed {G}_a^{perf}-module and its refinement which we call a quasi-ideal in {G}_a^{perf} -- following Drinfeld's terminology. Our main constructions show that there is a way to ``unwind" any pointed {G}_a^{perf}-module and define a notion of a cohomology theory for algebraic varieties. We use this machine to redefine de Rham cohomology theory and deduce its formal \'etalness and a few other properties.

Shubhodip's advisor is Bhargav Bhatt.


Speaker:  Shubhodip Mondal
Institution:  UM

Event Organizer:     


Edit this event (login required).
Add new event (login required).
For access requests and instructions, contact

Back to previous page
Back to UM Math seminars/events page.