4,243 research outputs found
Time-dependent evolution of two coupled Luttinger liquids
We consider two disconnected Luttinger liquids which are coupled at
through chiral density-density interactions. Both for and the
system is exactly solvable by means of bosonization and this allows to evaluate
analytically the time-dependence of correlation functions. We find that in the
long-time limit the critical exponent governing the one-particle correlation
function differs from the exponent dictated by the equilibrium ground state of
the coupled system. We also discuss how this reflects on some physical
quantities which are accessible in real experiments.Comment: 6 pages, 1 eps fig, revised version accepted for publication in Phys.
Rev.
Real time evolution using the density matrix renormalization group
We describe an extension to the density matrix renormalization group method
incorporating real time evolution into the algorithm. Its application to
transport problems in systems out of equilibrium and frequency dependent
correlation functions is discussed and illustrated in several examples. We
simulate a scattering process in a spin chain which generates a spatially
non-local entangled wavefunction.Comment: 4 pages, 4 eps figures, some minor corrections in text and Eq.(3
The Documentation and Analysis of a Change Initiative at the Buffalo Museum of Science
character, and writing, illustrating and publishing a short story for the enjoyment an
Reading Outside of School
Thomas, in The Teaching of English in Secondary Schools says, When we English teachers consider the infinitely small amount of reading our pupils can do in school hours, in contrast with the infinitely large amount they can do outside of school~ and will do in the years that, in varying number, stretch far beyond their graduation days, when we realize the opportunities that we have in directing them to books that will fill their lives with a loftier ideal and open to them an ampler range of thought and emotion, we are indeed false to our trust if we do not give earnest attention to the various possibilities for guiding them in their outside reading
On the behaviour of a rumour process with random stifling
We propose a realistic generalization of the Maki-Thompson rumour model by
assuming that each spreader ceases to propagate the rumour right after being
involved in a random number of stifling experiences. We consider the process
with a general initial configuration and establish the asymptotic behaviour
(and its fluctuation) of the ultimate proportion of ignorants as the population
size grows to . Our approach leads to explicit formulas so that the
limiting proportion of ignorants and its variance can be computed.Comment: 12 pages, to appear in Environmental Modelling & Softwar
Quantum data compression, quantum information generation, and the density-matrix renormalization group method
We have studied quantum data compression for finite quantum systems where the
site density matrices are not independent, i.e., the density matrix cannot be
given as direct product of site density matrices and the von Neumann entropy is
not equal to the sum of site entropies. Using the density-matrix
renormalization group (DMRG) method for the 1-d Hubbard model, we have shown
that a simple relationship exists between the entropy of the left or right
block and dimension of the Hilbert space of that block as well as of the
superblock for any fixed accuracy. The information loss during the RG procedure
has been investigated and a more rigorous control of the relative error has
been proposed based on Kholevo's theory. Our results are also supported by the
quantum chemistry version of DMRG applied to various molecules with system
lengths up to 60 lattice sites. A sum rule which relates site entropies and the
total information generated by the renormalization procedure has also been
given which serves as an alternative test of convergence of the DMRG method.Comment: 8 pages, 7 figure
Investigations into the Sarcomeric Protein and Ca2+-Regulation Abnormalities Underlying Hypertrophic Cardiomyopathy in Cats (Felix catus).
Hypertrophic cardiomyopathy (HCM) is the most common single gene inherited cardiomyopathy. In cats (Felix catus) HCM is even more prevalent and affects 16% of the outbred population and up to 26% in pedigree breeds such as Maine Coon and Ragdoll. Homozygous MYBPC3 mutations have been identified in these breeds but the mutations in other cats are unknown. At the clinical and physiological level feline HCM is closely analogous to human HCM but little is known about the primary causative mechanism. Most identified HCM causing mutations are in the genes coding for proteins of the sarcomere. We therefore investigated contractile and regulatory proteins in left ventricular tissue from 25 cats, 18 diagnosed with HCM, including a Ragdoll cat with a homozygous MYBPC3 R820W, and 7 non-HCM cats in comparison with human HCM (from septal myectomy) and donor heart tissue. Myofibrillar protein expression was normal except that we observed 20–44% MyBP-C haploinsufficiency in 5 of the HCM cats. Troponin extracted from 8 HCM and 5 non-HCM cat hearts was incorporated into thin filaments and studied by in vitro motility assay. All HCM cat hearts had a higher (2.06 ± 0.13 fold) Ca2+-sensitivity than non-HCM cats and, in all the HCM cats, Ca2+-sensitivity was not modulated by troponin I phosphorylation. We were able to restore modulation of Ca2+-sensitivity by replacing troponin T with wild-type protein or by adding 100 μM Epigallocatechin 3-gallate (EGCG). These fundamental regulatory characteristics closely mimic those seen in human HCM indicating a common molecular mechanism that is independent of the causative mutation. Thus, the HCM cat is a potentially useful large animal model
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