Title 



On the strong rigidity of solvable Lie algebras
 
Author 


  
Abstract 



We call a finitedimensional complex Lie algebra g strongly rigid if its universal enveloping algebra Ug is rigid as an associative algebra, i.e. every formal associative deformation is equivalent to the trivial deformation. The aim of this paper is to study the strong rigidity properties of solvable Lie algebras. First, we show that a strongly rigid Lie algebra has to be rigid as Lie algebra, this restricts the research to rigid Lie algebras. In addition the second scalar cohomology group has to vanish. Therefore the nilpotent Lie algebras of dimension greater or equal than two are not strongly rigid and the torus's dimension of strongly rigid solvable Lie algebra has to be one. Moreover, the Kontsevitch's theory of deformation quantization helps to see that every polynomial deformation of the linear Poisson structure on g* which induces a nonzero cohomology class of g leads to a nontrivial deformation of Ug. Since the rigidity is intimately related to cohomology, the cohomology groups are characterized. At last, we classify the ndimensional strongly rigid solvable Lie algebras where n <= 6 and give some remarks on linearizability of their corresponding Poisson structure.   
Language 



English
 
Source (journal) 



Lecture notes in pure and applied mathematics.  New York  
Source (book) 



NOG Workshop of the International Algebra Congress, SEP 1723, 2002, St Petersburg, RUSSIA  
Publication 



New York : 2006
 
ISBN 



082472349X
 
Volume/pages 



243(2006), p. 162174
 
ISI 



000236608600008
 
