Reentrant Bloch ferromagnetism

Triviality of Bloch and Bloch-Dirac bundles

In the framework of the theory of an electron in a periodic potential, we reconsider the longstanding problem of the existence of smooth and periodic quasi-Bloch functions, which is shown to be equivalent to the triviality of the Bloch bundle. By exploiting the time-reversal symmetry of the Hamiltonian and some bundle-theoretic methods, we show that the problem has a positive answer in any dime...

Bloch Brane

We investigate a system described by two real scalar fields coupled with gravity in (4, 1) dimensions in warped spacetime involving one extra dimension. The results show that the parameter which controls the way the two scalar fields interact induces the appearence of thick brane which engenders internal structure, driving the energy density to localize inside the brane in a very specific way.

Bloch equations_FF

Reproduction and ferromagnetism

I present a stochastic population model that combines cooperative interactions of the type often used in physics with the process of reproduction and death familiar to biology, and I refer to reasons why such interlocking may be of interest to both fields. Physics and biology have developed good frameworks to model the process of stochastic change in systems which experience the action of coope...

Reentrant Ventricular Arrhythmias

The effect of the autonomic system on conduction disorders in the infarction zone (IZ) and related reentrant ventricular arrhythmias (RVA) in the late myocardial infarction period in the dog was studied utilizing averaged recordings of the reentrant pathways from the epicardial surface of the IZ. Vagal (V) stimulation was found to have no significant direct electrophysiologic effect while sympa...