1,054 research outputs found
Free field approach to diagonalization of boundary transfer matrix : recent advances
We diagonalize infinitely many commuting operators . We call these
operators the boundary transfer matrix associated with the quantum
group and the elliptic quantum group. The boundary transfer matrix is related
to the solvable model with a boundary. When we diagonalize the boundary
transfer matrix, we can calculate the correlation functions for the solvable
model with a boundary. We review the free field approach to diagonalization of
the boundary transfer matrix associated with and
. We construct the free field realizations of the
eigenvectors of the boundary transfer matrix . This paper includes new
unpublished formula of the eigenvector for . It is thought that
this diagonalization method can be extended to more general quantum group
and elliptic quantum group .Comment: To appear in Group 28 : Group Theoretical Method in Physic
The Interpretation of Near-Infrared Star Counts at the South Galactic Pole
We present new deep counts of stars at the South Galactic Pole (SGP)
taken with the NAOJ PICNIC camera to . Star-galaxy separation to
was accomplished effectively using image profiles because the pixel
size we used is 0.509 arcsec. We interpret these counts using the SKY (Cohen
1994) model of the Galactic point source sky and determine the relative
normalization of halo-to-disk populations, and the location of the Sun relative
to the Galactic plane, within the context of this model. The observed star
counts constrain these parameters to be: halo/disk 1/900 and
z=16.52.5 pc. These values have been used to correct our SGP
galaxy counts for contamination by the point source Galactic foreground.Comment: accepted for publication in AJ, 15 pages with 2 figure
Big-Bang Nucleosynthesis with Unstable Gravitino and Upper Bound on the Reheating Temperature
We study the effects of the unstable gravitino on the big-bang
nucleosynthesis. If the gravitino mass is smaller than \sim 10 TeV, primordial
gravitinos produced after the inflation are likely to decay after the big-bang
nucleosynthesis starts, and the light element abundances may be significantly
affected by the hadro- and photo-dissociation processes as well as by the p n
conversion process. We calculate the light element abundances and derived upper
bound on the reheating temperature after the inflation. In our analysis, we
calculate the decay parameters of the gravitino (i.e., lifetime and branching
ratios) in detail. In addition, we performed a systematic study of the hadron
spectrum produced by the gravitino decay, taking account of all the hadrons
produced by the decay products of the gravitino (including the daughter
superparticles). We discuss the model-dependence of the upper bound on the
reheating temperature.Comment: 32 pages, 11 figure
The Infrared Cloud Monitor for the MAGNUM Robotic Telescope at Haleakala
We present the most successful infrared cloud monitor for a robotic
telescope. This system was originally developed for the MAGNUM 2-m telescope,
which has been achieving unmanned and automated monitoring observation of
active galactic nuclei at Haleakala on the Hawaiian island of Maui since 2001.
Using a thermal imager and two aspherical mirrors, it at once sees almost the
whole sky at a wavelength of . Its outdoor part is
weather-proof and is totally maintenance-free. The images obtained every one or
two minutes are analysed immediately into several ranks of weather condition,
from which our automated observing system not only decides to open or close the
dome, but also selects what types of observations should be done. The whole-sky
data accumulated over four years show that 5060 % of all nights are
photometric, and about 75 % are observable with respect to cloud condition at
Haleakala. Many copies of this system are now used all over the world such as
Mauna Kea in Hawaii, Atacama in Chile, and Okayama and Kiso in Japan.Comment: 18 pages, 15 figures, 7 tables, accepted for publication in PAS
Electronic structure and effects of dynamical electron correlation in ferromagnetic bcc-Fe, fcc-Ni and antiferromagnetic NiO
LDA+DMFT method in the framework of the iterative perturbation theory (IPT)
with full LDA Hamiltonian without mapping onto the effective Wannier orbitals.
We then apply this LDA+DMFT method to ferromagnetic bcc-Fe and fcc-Ni as a test
of transition metal, and to antiferromagnetic NiO as an example of transition
metal oxide. In Fe and Ni, the width of occupied 3d bands is narrower than
those in LDA and Ni 6eV satellite appears. In NiO, the resultant electronic
structure is of charge-transfer insulator type and the band gap is 4.3eV. These
results are in good agreement with the experimental XPS. The configuration
mixing and dynamical correlation effects play a crucial role in these results
Elliptic Deformed Superalgebra
We introduce the elliptic superalgebra as one
parameter deformation of the quantum superalgebra . For an
arbitrary level we give the bosonization of the elliptic
superalgebra and the screening currents that commute
with modulo total difference.Comment: LaTEX, 25 page
The Elliptic Algebra U_{q,p}(sl_N^) and the Deformation of W_N Algebra
After reviewing the recent results on the Drinfeld realization of the face
type elliptic quantum group B_{q,lambda}(sl_N^) by the elliptic algebra
U_{q,p}(sl_N^), we investigate a fusion of the vertex operators of
U_{q,p}(sl_N^). The basic generating functions \Lambda_j(z) (j=1,2,.. N-1) of
the deformed W_N algebra are derived explicitly.Comment: 15 pages, to appear in Journal of physics A special issue - RAQIS0
The Integrals of Motion for the Deformed W-Algebra II: Proof of the commutation relations
We explicitly construct two classes of infinitly many commutative operators
in terms of the deformed W-algebra , and give proofs of the
commutation relations of these operators. We call one of them local integrals
of motion and the other nonlocal one, since they can be regarded as elliptic
deformation of local and nonlocal integrals of motion for the algebra.Comment: Dedicated to Professor Tetsuji Miwa on the occasion on the 60th
birthda
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