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Full-Text Articles in Physics

Short-Range Smectic Order In Bent-Core Nematic Liquid Crystals, Seung Ho Hong, Rafael Verduzco, J. C. Williams, Robert J. Twieg, E. Dimasi, R. Pindak, Antal Jakli, Jim T. Gleeson, Samuel N. Sprunt Aug 2010

Short-Range Smectic Order In Bent-Core Nematic Liquid Crystals, Seung Ho Hong, Rafael Verduzco, J. C. Williams, Robert J. Twieg, E. Dimasi, R. Pindak, Antal Jakli, Jim T. Gleeson, Samuel N. Sprunt

Chemical Physics Publications

Small angle X-ray diffraction from the uniaxial nematic phase of certain bent-core liquid crystals is shown to be consistent with the presence of molecular clusters possessing short-range tilted smectic (smectic-C) order. Persistence of these clusters throughout the nematic phase, and even into the isotropic state, likely accounts for the unusual macroscopic behavior previously reported in bent-core nematics, including an anomalously large flexoelectric effect (similar to 1000 times that of conventional calamitic nematics), very large orientational and flow viscosities (similar to 10 100 and similar to 100 1000 times, respectively, typical values for calamitics), and an extraordinary flow birefringence observed in ...


High-Energy Amplitudes In N= 4 Sym In The Next-To-Leading Order, Ian Balitsky, Giovanni A. Chirilli Mar 2010

High-Energy Amplitudes In N= 4 Sym In The Next-To-Leading Order, Ian Balitsky, Giovanni A. Chirilli

Physics Faculty Publications

The high-energy behavior of the N = 4 SYM amplitudes in the Regge limit can be calculated order by order in perturbation theory using the high-energy operator expansion in Wilson lines. At large Nc , a typical four-point amplitude is determined by a single BFKL pomeron. The conformal structure of the four-point amplitude is fixed in terms of two functions: pomeron intercept and the coefficient function in front of the pomeron (the product of two residues). The pomeron intercept is universal while the coefficient function depends on the correlator in question. The intercept is known in the first two orders in coupling ...