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LETTERS IN MATHEMATICAL PHYSICS, vol.76, no.1, pp.77-91, 2006 (Journal Indexed in SCI)
We define a new algebra of noncommutative differential forms for any Hopf algebra with an invertible antipode. We prove that there is a one-to-one correspondence between anti-Yetter-Drinfeld modules, which serve as coefficients for the Hopf cyclic (co)homology, and modules which admit a flat connection with respect to our differential calculus. Thus, we show that these coefficient modules can be regarded as "flat bundles" in the sense of Connes' noncommutative differential geometry.