Group of contact transformations: Symmetry classification of Fokker-Planck type equations

Pramana ◽  
1999 ◽  
Vol 53 (5) ◽  
pp. 795-806
Author(s):  
P Rudra
2008 ◽  
Vol 53 (3) ◽  
pp. 359-364 ◽  
Author(s):  
A. L. Talis ◽  
O. A. Belyaev ◽  
A. A. Reu ◽  
R. A. Talis

The symmetry classification of the states of a pair of interacting ions in a crystal is obtained by a formal symmetry reduction not dependent upon any assumptions about the details of the interaction. The theory is given in versions valid with or without spin-orbit coupling, and for pairs in magnetic or non-magnetic hosts. Some discrepancies with previous work are discussed.


2012 ◽  
Vol 85 (11) ◽  
Author(s):  
E. Kogan ◽  
V. U. Nazarov

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