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Cohomology of Modules Over $H$-categories and Co-$H$-categories

Published online by Cambridge University Press:  06 August 2019

Mamta Balodi
Department of Mathematics, Indian Institute of Science, Bangalore560012, India Email:
Abhishek Banerjee
Department of Mathematics, Indian Institute of Science, Bangalore560012, India Email:
Samarpita Ray
Department of Mathematics, Indian Institute of Science, Bangalore560012, India Email:


Let $H$ be a Hopf algebra. We consider $H$-equivariant modules over a Hopf module category ${\mathcal{C}}$ as modules over the smash extension ${\mathcal{C}}\#H$. We construct Grothendieck spectral sequences for the cohomologies as well as the $H$-locally finite cohomologies of these objects. We also introduce relative $({\mathcal{D}},H)$-Hopf modules over a Hopf comodule category ${\mathcal{D}}$. These generalize relative $(A,H)$-Hopf modules over an $H$-comodule algebra $A$. We construct Grothendieck spectral sequences for their cohomologies by using their rational $\text{Hom}$ objects and higher derived functors of coinvariants.

© Canadian Mathematical Society 2019

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Author M.B. was supported by SERB Fellowship PDF/2017/000229. Author A.B. was partially supported by SERB Matrics fellowship MTR/2017/000112.


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