14,223 research outputs found
Characterization of the Structure of Saudi Crude Asphaltenes by X-ray Diffraction
Structural characterization studies have been carried out on four commercial Saudi Arabian
crude oils. The aromaticity and crystallite parameters of the asphaltenes were studied by X-ray
diffraction methods and compared to the average structural parameters calculated from nuclear
magnetic resonance spectra
Entanglement entropy of dispersive media from thermodynamic entropy in one higher dimension
A dispersive medium becomes entangled with zero-point fluctuations in the
vacuum. We consider an arbitrary array of material bodies weakly interacting
with a quantum field and compute the quantum mutual information between them.
It is shown that the mutual information in D dimensions can be mapped to
classical thermodynamic entropy in D+1 dimensions. As a specific example, we
compute the mutual information both analytically and numerically for a range of
separation distances between two bodies in D=2 dimensions and find a
logarithmic correction to the area law at short separations. A key advantage of
our method is that it allows the strong subadditivity property---notoriously
difficult to prove for quantum systems---to be easily verified.Comment: Corrected typos. Added reference
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