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Chien-Yi Chang
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The Schrodinger Wave Functional and Vacuum State in Curved Spacetime II. Boundaries and Foliations
Thomas Palmer
et al.
Jul 14, 1996
In a recent paper, general solutions for the vacuum wave functionals in theSchrodinger picture were given for a variety of classes of curved spacetimes.Here, we describe a number of simple examples which illustrate how the presenceof spacetime boundaries influences the vacuum wave functional and how physicalquantities are independent of the choice of spacetime foliation used in theSchrodinger approach despite the foliation dependence of the wave functionalsthemselves.
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Spin-phonon interaction in doped high-T$_C$ superconductors from density functional calculations
Michele Greco
et al.
Dec 19, 2001
Effects of coupling between phonon distortions and stripe-like spin waves inthe CuO plane of HgBa$_2$CuO$_4$ are studied by band calculations. Localexchange enhancements depend sensitively on the local structure around Cusites. Interactions where spin waves have twice as long wave length as phononwaves can lead to a 'dip' in the density of states (DOS) below the Fermienergy, $E_F$. This type of interaction is compatible with several seeminglycontradictory observations among high-$T_C$ cuprates, like the isotope effect,anti-ferromagnetic fluctuations, stripes and pseudogaps. It can also accountfor a large $T_C$.
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