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On the general XY Model: positive and zero temperature, selection and non-selection
the general XY Model positive zero temperature non-selection Dynamical Systems
2011/7/28
On the general XY Model: positive and zero temperature, selection and non-selection.
Exposed faces for decomposable positive linear maps arising from completely positive maps
decomposable positive maps exposed faces product vectors
2011/7/25
Abstract: Let $D$ be a space of $2\times n$ matrices. Then the face of the cone of all completely positive maps from $M_2$ into $M_n$ given by $D$ is an exposed face of the bigger cone of all decompos...
A completely positive map associated with a positive map
positive map associated positive map
2010/10/27
We show that each positive map from B(K) to B(H) is a scalar mul-tiple of a map of the form T r − with completely positive. This is used to give necessary and sufficient conditions for maps ...
Spinors and Positive Mass
Spinors Positive Mass
2010/4/15
As an example of how spinor methods can be applied to the positive-mass theorem, a simple, spinor-based proof of the theorem is presented for the case of a single black hole. Generalisations of the th...