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Borel invariant for measurable cocycles of 3-manifold groups

We introduce the notion of pullback along a measurable cocycle and we use it to extend the Borel invariant studied by Bucher, Burger and Iozzi to the world of measurable cocycles. The Borel invariant is constant along cohomology classes and has bounded absolute value. This allows to define maximal cocycles. We conclude by proving that maximal cocycles are actually trivializable to the restriction of the irreducible representation.

preprint2021arXivOpen access
Alessio Savini
math.GT
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Alessio Savini

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