1.
Phys Rev Lett
; 88(23): 230402, 2002 Jun 10.
Artigo
em Inglês
| MEDLINE
| ID: mdl-12059340
RESUMO
We consider a single free spin- 1 / 2 particle. The reduced density matrix for its spin is not covariant under Lorentz transformations. The spin entropy is not a relativistic scalar and has no invariant meaning.