1,396 research outputs found
Tabulation of PVI Transcendents and Parametrization Formulas (August 17, 2011)
The critical and asymptotic behaviors of solutions of the sixth Painlev\'e
equation PVI, obtained in the framework of the monodromy preserving deformation
method, and their explicit parametrization in terms of monodromy data, are
tabulated.Comment: 30 pages, 1 figure; Nonlinearity 201
The Nature of Lya Blobs: Supernova-Dominated Primordial Galaxies
We consider a forming galaxy undergoing multitudinous supernova (SN)
explosions, as a possible model of \lya blobs (LABs). For this purpose, an
ultra--high resolution hydrodynamic simulation is performed using grid
points, where SN remnants are resolved with sufficient accuracy. It is found
that multiple SN explosions produce kpc--size expanding hot bubbles, which
drive cool, dense shells by strong shock. The colliding high--density cooling
shells radiate intensive \lya emission, resulting in a high \lya luminosity of
erg s, comparable to the observed level in LABs. Also,
recently discovered bubbly features in some LABs are quite similar to the
structure predicted in the present simulation. Furthermore, the result
demonstrates that LABs are representative of evolving primordial galaxies; they
could hold direct information on the early chemical enrichment of galaxies,
contrary to present--day galaxies which have undergone intense recycling of
interstellar matter, thus erasing most of the early chemical history. It turns
out that the metal mixing proceeds in a very inhomogeneous fashion, so that
there appears a large spread of metallicity, that is, or . Hence, the early
galactic chemical evolution may have proceeded in a different manner from that
hitherto considered in one--zone models.Comment: 4 pages, 2 figures, accepted fot publicatin in ApJ
Rational Solutions of the Painleve' VI Equation
In this paper, we classify all values of the parameters , ,
and of the Painlev\'e VI equation such that there are
rational solutions. We give a formula for them up to the birational canonical
transformations and the symmetries of the Painlev\'e VI equation.Comment: 13 pages, 1 Postscript figure Typos fixe
A generalization of determinant formulas for the solutions of Painlev\'e II and XXXIV equations
A generalization of determinant formulas for the classical solutions of
Painlev\'e XXXIV and Painlev\'e II equations are constructed using the
technique of Darboux transformation and Hirota's bilinear formalism. It is
shown that the solutions admit determinant formulas even for the transcendental
case.Comment: 20 pages, LaTeX 2.09(IOP style), submitted to J. Phys.
Imprint of Gravitational Lensing by Population III Stars in Gamma Ray Burst Light Curves
We propose a novel method to extract the imprint of gravitational lensing by
Pop III stars in the light curves of Gamma Ray Bursts (GRBs). Significant
portions of GRBs can originate in hypernovae of Pop III stars and be
gravitationally lensed by foreground Pop III stars or their remnants. If the
lens mass is on the order of and the lens redshift is
greater than 10, the time delay between two lensed images of a GRB is s and the image separation is as. Although it is difficult to
resolve the two lensed images spatially with current facilities, the light
curves of two images are superimposed with a delay of s. GRB light
curves usually exhibit noticeable variability, where each spike is less than
1s. If a GRB is lensed, all spikes are superimposed with the same time delay.
Hence, if the autocorrelation of light curve with changing time interval is
calculated, it should show the resonance at the time delay of lensed images.
Applying this autocorrelation method to GRB light curves which are archived as
the {\it BATSE} catalogue, we demonstrate that more than half light curves can
show the recognizable resonance, if they are lensed. Furthermore, in 1821 GRBs
we actually find one candidate of GRB lensed by a Pop III star, which may be
located at redshift 20-200. The present method is quite straightforward and
therefore provides an effective tool to search for Pop III stars at redshift
greater than 10. Using this method, we may find more candidates of GRBs lensed
by Pop III stars in the data by the {\it Swift} satellite.Comment: 13 pages, 13 figures, accepted for publication in Ap
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