2 papers
math-ph2011
Extended BRST symmetries. Quantum approach
Radu Constantinescu, Carmen Ionescu
The aim of this lecture is to present in a comprehensible way what the BRST quantization means and how the "classical" master equation, action and BRST transformations have to be p…
quant-ph2004
Bi-partite and global entanglement in a many-particle system with collective spin coupling
R. G. Unanyan, C. Ionescu, M. Fleischhauer
Bipartite and global entanglement are analyzed for the ground state of a system of spin 1/2 particles interacting via a collective spin-spin coupling described by the Lipkin-Me…