ar X iv : c on d - m at / 9 31 20 08 v 1 2 D ec 1 99 3 Theory of the Eigler - switch

ar X iv : m at h / 99 07 08 5 v 2 [ m at h . G R ] 1 7 D ec 1 99 9 LOOPS AND SEMIDIRECT PRODUCTS

ar X iv : n uc l - th / 9 31 20 21 v 1 2 8 D ec 1 99 3 Meson phase space density from interferometry

X iv :n uc lth /9 31 20 21 v1 2 8 D ec 1 99 3 Meson phase space density from interferometry George F. Bertsch Dept. of Physics and Institute for Nuclear Theory, FM-15 University of Washington Seattle, WA 98195 Abstract The interferometric analysis of meson correlations provides a measure of the average phase space density of the mesons in the final state. This quantity is a useful indicator of ...

ar X iv : c on d - m at / 9 31 20 90 v 1 2 2 D ec 1 99 3 Hund ’ s Rule for Composite Fermions

We consider the " fractional quantum Hall atom " in the vanishing Zeeman energy limit, and investigate the validity of Hund's maximum-spin rule for interacting electrons in various Landau levels. While it is not valid for electrons in the lowest Landau level, there are regions of filling factors where it predicts the ground state spin correctly provided it is applied to composite fermions. The ...

ar X iv : m at h / 99 12 12 3 v 1 [ m at h . D G ] 1 5 D ec 1 99 9 CURVATURE , DIAMETER AND BOUNDED BETTI NUMBERS

ar X iv : c on d - m at / 9 31 20 89 v 1 2 2 D ec 1 99 3 Spin - gap formation in cuprates : gauge theory

We analyze the phase diagram of single and bi-layer cuprates using the gaugefield description of the t-J model. For T > TBE the in-plane fermion-pairing order parameter ∆‖ is eliminated by gauge field fluctuations, leading us to predict the absence of a spin-gap phase in single-layer cuprates. For bi-layer cuprates the inter-layer order parameter ∆⊥ is enhanced by spin correlations, and is less...