Mathematics – Quantum Algebra
Scientific paper
2005-10-12
Appl. Cat. Str. 14 (2006) 431-469
Mathematics
Quantum Algebra
32 pages, LaTeX. v2:Substantial revision, distinguishing between comodules of both constituent bialgebroids in a Hopf algebroi
Scientific paper
The notions of a cleft extension and a cross product with a Hopf algebroid are introduced and studied. In particular it is shown that an extension (with a Hopf algebroid $H= (H_L,H_R)$) is cleft if and only if it is $H_R$-Galois and has a normal basis property relative to the base ring $L$ of $H_L$. Cleft extensions are identified as crossed products with invertible cocycles. The relationship between the equivalence classes of crossed products and gauge transformations is established. Strong connections in cleft extensions are classified and sufficient conditions are derived for the Chern-Galois characters to be independent on the choice of strong connections. The results concerning cleft extensions and crossed product are then extended to the case of weak cleft extensions of Hopf algebroids hereby defined.
Böhm Gabriella
Brzezinski Tomasz
No associations
LandOfFree
Cleft extensions of Hopf algebroids does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Cleft extensions of Hopf algebroids, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cleft extensions of Hopf algebroids will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-686216