169,922 research outputs found
Was Sierpinski right? III Can continuum--c.c. times c.c.c. be continuum--c.c.?
We prove the consistency of: if B_1, B_2 are Boolean algebra satisfying the
c.c.c. and the 2^{aleph_0}-c.c. respectively then B_1 x B_2 satisfies the
2^{aleph_0}-c.c
On CON(Dominating_lambda > cov_\lambda(meagre))
We prove the consistency of: for suitable strongly inaccessible cardinal
lambda the dominating number, i.e. the cofinality of lambda^lambda is strictly
bigger than cov(meagre_lambda), i.e. the minimal number of nowhere dense
subsets of 2^lambda needed to cover it. This answers a question of Matet
Critical Current in the High-T_c Glass model
The high-T_c glass model can be combined with the repulsive tt'--Hubbard
model as microscopic description of the striped domains found in the high-T_c
materials. In this picture the finite Hubbard clusters are the origin of the
d-wave pairing. In this paper we show, that the glass model can also explain
the critical currents usually observed in the high-T_c materials. We use two
different approaches to calculate the critical current densities of the
high-T_c glass model. Both lead to a strongly anisotropic critical current.
Finally we give an explanation, why we expect nonetheless a nearly perfect
isotropic critical current in the high-T_c superconductors.Comment: 8 pages with 5 eps-figures, LaTeX using RevTeX, accepted by
Int.J.Mod.Phys.
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