We define a Lie bialgebra cohomology as the total cohomology of a double complex constructed from a Lie algebra and its dual, we show that its 2-cocycles classify Lie bialgebra formal deformations and we prove the usual cohomological condition (i. e. H-2 = 0) for formal rigidity. Lastly we describe the results of explicit computations in low-dimensional cases.
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Natl Res Univ Higher Sch Econ, Int Lab Representat Theory & Math Phys, 20 Myasnitskay Ulitsa, Moscow 101000, Russia
ITEP, Bolshaya Cheremushkinskaya 25, Moscow 117259, RussiaNatl Res Univ Higher Sch Econ, Int Lab Representat Theory & Math Phys, 20 Myasnitskay Ulitsa, Moscow 101000, Russia
Khoroshkin, Anton
Merkulov, Sergei
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Luxembourg Univ, Math Res Unit, Grand Duchy Luxembourg, LuxembourgNatl Res Univ Higher Sch Econ, Int Lab Representat Theory & Math Phys, 20 Myasnitskay Ulitsa, Moscow 101000, Russia
Merkulov, Sergei
Willwacher, Thomas
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Univ Zurich, Inst Math, Zurich, SwitzerlandNatl Res Univ Higher Sch Econ, Int Lab Representat Theory & Math Phys, 20 Myasnitskay Ulitsa, Moscow 101000, Russia