2002/03/31 by Asher Peres, Petra F. Scudo, Daniel R. Terno · 2 citations
Physics and Astronomy · #quant-ph #hep-th
paper · pdf · doi:10.1103/physrevlett.88.230402
published as Phys.Rev.Lett.88:230402,2002 · final version
arxiv created 2002/05/24 · arxiv updated 2011/06/24
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.