Geodesic
Representations of Nilpotent Groups: Extensions, Neutral Cohomology, and Pontryagin Spaces
Funkcionalʹnyj analiz i ego priloženiâ, Tome 49 (2015) no. 3, pp. 79-83.

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Spectral criteria for the cohomological triviality of extensions of representations of connected nilpotent groups are obtained. They are applied to the study of symmetrized extensions of unitary representations by finite-dimensional representations and to the theory of $J$-unitary representations of groups on Pontryagin spaces.
Keywords: extension of representation, Pontryagin space, Engel element, neutral cocycle. 
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È. V. Kissin; V. S. Shulman. Representations of Nilpotent Groups: Extensions, Neutral Cohomology, and Pontryagin Spaces. Funkcionalʹnyj analiz i ego priloženiâ, Tome 49 (2015) no. 3, pp. 79-83. http://geodesic.mathdoc.fr/item/FAA_2015_49_3_a8/

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