11,581 research outputs found
Pseudoscalar Mesons in the SU(3) Linear Sigma Model with Gaussian Functional Approximation
We study the SU(3) linear sigma model for the pseudoscalar mesons in the
Gaussian Functional Approximation (GFA). We use the SU(3) linear sigma model
Lagrangian with nonet scalar and pseudo-scalar mesons including symmetry
breaking terms. In the GFA, we take the Gaussian Ansatz for the ground state
wave function and apply the variational method to minimize the ground state
energy. We derive the gap equations for the dressed meson masses, which are
actually just variational parameters in the GFA method. We use the
Bethe-Salpeter equation for meson-meson scattering which provides the masses of
the physical nonet mesons. We construct the projection operators for the flavor
SU(3) in order to work out the scattering T-matrix in an efficient way. In this
paper, we discuss the properties of the Nambu-Goldstone bosons in various
limits of the chiral symmetry.Comment: 28 pages, comments and suggestions welcom
Theory of doped Mott insulators: duality between pairing and magnetism
By bosonizing the electronic t-J model exactly on any two-dimensional (2D)
lattices, and integrating out the gauge fluctuations combined to slave
particles beyond mean fields, we get a theory in terms of physical Cooper pair
and spin condensates. In the sense of mutual Berry phase they turns out to be
dual to each other. The mutual-duality is the missing key in the
resonant-valance-bond idea\cite{rvb} to work as a paradigm of doped 2D Mott
insulators. We argue that essential aspects of high- phenomenology find
natural solutions in the theory. We also provide interesting predictions for
systems on hexagonal lattices.Comment: 4 pages, no figures, Submitted to Phys. Rev. Let
Baryons with U_L(3)*U_R(3) Chiral Symmetry IV: Interactions with Chiral (8,1)+(1,8) Vector and Axial-vector Mesons and Anomalous Magnetic Moments
We construct all SU_L(3)*SU_R(3) chirally invariant anomalous magnetic, i.e.
involving a Pauli tensor and one-derivative, interactions of one
chiral-[(8,1)+(1,8)] meson field with chiral-[(6,3)+(3,6)],
[(3,\bar3)+(\bar3,3)], and [(8,1)+(1,8)] baryon fields and their "mirror"
images. We find strong chiral selection rules: e.g. there is only one
off-diagonal chirally symmetric anomalous magnetic interaction between J=1/2
fields belonging to the [(6,3)+(3,6)] and the [(3,\bar3)+(\bar3,3)] chiral
multiplets. We also study the chiral selection rules for the anomalous magnetic
interactions of the [(3,\bar3)+(\bar3,3)] and the [(8,1)+(1,8)] baryon fields.
Again, no diagonal and only one off-diagonal chiral SU_L(3)*SU_R(3) interaction
of this type is allowed, that turns out also to conserve the U_A(1) symmetry.
We calculate the F/D ratios for the baryons' anomalous magnetic moments
predicted by these interactions in the SU(3) symmetry limit and find that only
the [(6,3)+(3,6)]-[(3,\bar3)+(\bar3,3)] one, reproduces F/D=1/3, in close
proximity to the value extracted from experiment.Comment: 16 pages, 2 tables, accepted by PR
Probing subtle fluorescence dynamics in cellular proteins by streak camera based Fluorescence Lifetime Imaging Microscopy
We report the cell biological applications of a recently developed
multiphoton fluorescence lifetime imaging microscopy system using a streak
camera (StreakFLIM). The system was calibrated with standard fluorophore
specimens and was shown to have high accuracy and reproducibility. We
demonstrate the applicability of this instrument in living cells for measuring
the effects of protein targeting and point mutations in the protein sequence
which are not obtainable in conventional intensity based fluorescence
microscopy methods. We discuss the relevance of such time resolved information
in quantitative energy transfer microscopy and in measurement of the parameters
characterizing intracellular physiology
- …