1,669 research outputs found
Boundary state of superstring in open string channel
We derive boundary state of superstring in the open string channel. It
describes the superconformal field theory of open string emission and
absorption by D-brane. We define the boundary state by conformal mappings from
upper half plane with operators inserted at two points corresponding to the
corners of semi-infinite strip. We obtain explicit oscillator forms
analytically for the fermion and superconformal ghost sectors. For the fermion
sector we compare this with numerical result obtained by using naive boundary
condition.Comment: 20 pages, 2 figures, PTPTeX; typos corrected, minor change
Boundary states in the open string channel and CFT near a corner
We generalize the idea of boundary states to the open string channel. They
describe emission and absorption of open strings in the presence of
intersecting D-branes. We construct the explicit oscillator representation for
the free boson and fermionic ghost. The inner product of such states describes
a disk amplitude of rectangular shape and possesses modular covariance with a
nontrivial conformal weight. We compare the result obtained here with those
obtained using two different methods, one employing the path integral formalism
and one employing the conformal anomaly. We find that all these methods give
consistent results. In our method, we must be careful in our treatment of the
singularity of the CFT near the corners. Specifically, we derive the correction
to the conformal weight of the primary field inserted at the corner, and it
gives the modular weight of the rectangle amplitude. We also carry out explicit
computations of the correlation functions.Comment: 23 pages, 4 figures, PTPTeX, v2 references added and some equations
improved, v3 style macro has been changed. BRST analysis adde
Continuum Coupling and Pair Correlation in Weakly Bound Deformed Nuclei
We formulate a new Hartree-Fock-Bogoliubov method applicable to weakly bound
deformed nuclei using the coordinate-space Green's function technique. An
emphasis is put on treatment of quasiparticle states in the continuum, on which
we impose the correct boundary condition of the asymptotic out-going wave. We
illustrate this method with numerical examples.Comment: 5 pages, 4 figures, Proceedings of the Japanese French Symposium -
New paradigms in Nuclear Physics, Paris, 29th September - 2nd October, to be
published in Int. J. of Modern Physics
Temporal association of vitreous hemorrhage and hypertension after COVIDā19 mRNA vaccines
Vitreous hemorrhage as common eye presentation and hypertension as common systemic presentation are difficult to designate whether they are coincidental or causal in terms of adverse events of COVID-19 vaccinations. Temporal association of hypertension and vitreous hemorrhage was noted in a patient repeatedly after the second and third COVID-19 vaccinations
FTS Measurements of Submillimeter-Wave Atmospheric Opacity at Pampa la Bola III. Water Vapor, Liquid Water, and 183 GHz Water Vapor Line Opacities
Further analysis has been made on the millimeter and submillimeter-wave
(100-1600 GHz or 3 mm - 188 micron) atmospheric opacity data taken with the
Fourier Transform Spectrometer (FTS) at Pampa la Bola, 4800 m above sea level
in northern Chile, which is the site of the Atacama Large
Millimeter/submillimeter Array (ALMA). Time-sequence plots of millimeter and
submillimeter-wave opacities show similar variations to each other, except for
during the periods with liquid water (fog or clouds) in the atmosphere. Using
millimeter and submillimeter-wave opacity correlations under two conditions,
which are affected and not affected by liquid water, we succeeded to separate
the measured opacity into water vapor and liquid water opacity components. The
water vapor opacity shows good correlation with the 183 GHz water vapor line
opacity, which is also covered in the measured spectra. On the other hand, the
liquid water opacity and the 183 GHz line opacity show no correlation. Since
only the water vapor component is expected to affect the phase of
interferometers significantly, and the submillimeter-wave opacity is less
affected by the liquid water component, it may be possible to use the
submillimeter-wave opacity for a phase-correction of submillimeter
interferometers.Comment: 10 pages, 5 figures, PASJ, vol.55, no.1 (2003), in pres
Possible Excitonic Phase of Graphite in the Quantum Limit State
The in-plane resistivity, Hall resistivity and magnetization of graphite were
investigated in pulsed magnetic fields applied along the \textit{c}-axis. The
Hall resistivity approaches zero at around 53 T where the in-plane and
out-of-plane resistivities steeply decrease. The differential magnetization
also shows an anomaly at around this field with a similar amplitude compared to
that of de Haas-van Alphen oscillations at lower fields. This transition field
appears insensitive to disorder, but reduces with doping holes. These results
suggest the realization of the quantum limit states above 53 T. As a plausible
explanation for the observed gapped out-of-plane conduction above 53 T, the
emergence of the excitonic BCS-like state in graphite is proposed.Comment: 15 pages, 6 figures, to be published in J. Phys. Soc. Jp
Brain tumors induced in rats by human adenovirus type 12
Oncogenesis of human adenovirus type 12 in the brain
of rats was examined. Newborn rats of Sprague-Dawley and Donryu strains were injected intracranially with human adenovirus type 12. The incidence of intracranial tumors was 91% (30/33) in SpragueDawley and 56% (14/25) in Donryu rats. Except for one tumor nodule located in the parietal cortex of a Sprague.Dawley rat, all tumors developed in the paraventricular areas or in the meninges. Tumors
were quite similar histologically to those induced in hamsters and mice resembling the undifferentiated human brain tumors such as medulloblastoma, ependymoblastoma and embryonic gliomas. From the histological features and primary sites of tumor development, it is suggested that the tumors in the brain of rats induced by adenovirus
type 12 originate from the embryonic cells in the paraventricular area and also from the undifferentiated supporting cells of the peripheral nerves in the leptomeninges.</p
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