44 research outputs found
Born of Two Koreas, of Human Blood: Monstrosity and the Discourse of Humanity and Pacifism in the Film Bulgasari
As in the Western world, Korea has a variety of mythical monsters. Among them is Bulgasari, an iron-eating monster, which will be the main topic of this paper. The monster’s name “Bulgasari” has a paradoxical meaning in Korean, which is “cannot be killed but can be killed by fire.” The meaning of the name represents the wide gamut of ambivalent identity ranging from physical to metaphorical aspects of the monster. It also provides a uniquely Korean reception and interpretation of being monstrous as distinctive from the archetypal imagery and general understanding of monstrosity as “enduring evil,” as seen in most myths and tradition. For instance, Bulgasari’s destructive power is frequently portrayed in the myth as a heroic trait to protect social justice by condemning and punishing the evils of society. Such an ambivalent identity as both monster and hero shows that Bulgasari’s embodiment of monstrosity is recognized through a different or rather complex mechanism in Korean-specific context, not uniformly recognized as enduring evil. This study traces historical descriptions of the monster Bulgasari in legend, literature, and film adaptation. Especially focusing on the North Korean film Bulgasari (1985), this study explores the way in which the ambivalent identity of the monster develops into discourses of humanity and pacifism, in both Korean-specific and transnational contexts, while mirroring the Korean and global sense of reality situated in this era of South-North division and nuclear holocaust
Dark matter in gravity-mediated supersymmetry breaking
In R parity conserving supersymmetric theories the lightest superpartner
(LSP) is stable. The LSPs may comprise a large fraction of the energy density
of the current universe, which would lead to dramatic astrophysical
consequences. In this talk, I discuss some of the main lessons we have learned
about supersymmetric models from relic abundance considerations of the LSP.Comment: 6 pages, LaTeX with espcrc2.sty, to be published in the "Proceedings
of the 5th International Conference on Supersymmetries in Physics (SUSY 97)",
Philadelphia, Pennsylvania, May 27-31, 199
Indirect Detection of a Light Higgsino Motivated by Collider Data
Kane and Wells recently argued that collider data point to a Higgsino-like
lightest supersymmetric partner which would explain the dark matter in our
Galactic halo. They discuss direct detection of such dark-matter particles in
laboratory detectors. Here, we argue that such a particle, if it is indeed the
dark matter, might alternatively be accessible in experiments which search for
energetic neutrinos from dark-matter annihilation in the Sun. We provide
accurate analytic estimates for the rates which take into account all relevant
physical effects. Currently, the predicted signal falls roughly one to three
orders of magnitude below experimental bounds, depending on the mass and
coupling of the particle; however, detectors such as MACRO, super-Kamiokande,
and AMANDA will continue to take data and should be able to rule out or confirm
an interesting portion of the possible mass range for such a dark-matter
particle within the next five years.Comment: 10 pages, RevTe
Neutron beam test of CsI crystal for dark matter search
We have studied the response of Tl-doped and Na-doped CsI crystals to nuclear
recoils and 's below 10 keV. The response of CsI crystals to nuclear
recoil was studied with mono-energetic neutrons produced by the
H(p,n)He reaction. This was compared to the response to Compton
electrons scattered by 662 keV -ray. Pulse shape discrimination between
the response to these 's and nuclear recoils was studied, and quality
factors were estimated. The quenching factors for nuclear recoils were derived
for both CsI(Na) and CsI(Tl) crystals.Comment: 21pages, 14figures, submitted to NIM
SICANE: a Detector Array for the Measurement of Nuclear Recoil Quenching Factors using Monoenergetic Neutron Beam
SICANE is a neutron scattering multidetector facility for the determination
of the quenching factor (ratio of the response to nuclear recoils and to
electrons) of cryogenic detectors used in direct WIMP searches. Well collimated
monoenergetic neutron beams are obtained with inverse (p,n) reactions. The
facility is described, and results obtained for the quenching factors of
scintillation in NaI(Tl) and of heat and ionization in Ge are presented.Comment: 30 pages, Latex, 11 figures. Submitted to NIM
Aidnogenesis via Leptogenesis and Dark Sphalerons
We discuss aidnogenesis, the generation of a dark matter asymmetry via new
sphaleron processes associated to an extra non-abelian gauge symmetry common to
both the visible and the dark sectors. Such a theory can naturally produce an
abundance of asymmetric dark matter which is of the same size as the lepton and
baryon asymmetries, as suggested by the similar sizes of the observed baryonic
and dark matter energy content, and provide a definite prediction for the mass
of the dark matter particle. We discuss in detail a minimal realization in
which the Standard Model is only extended by dark matter fermions which form
"dark baryons" through an SU(3) interaction, and a (broken) horizontal symmetry
that induces the new sphalerons. The dark matter mass is predicted to be
approximately 6 GeV, close to the region favored by DAMA and CoGeNT.
Furthermore, a remnant of the horizontal symmetry should be broken at a lower
scale and can also explain the Tevatron dimuon anomaly.Comment: Minor changes, discussion of present constraints expanded. 16 pages,
2 eps figures, REVTeX
The Formation of Cosmic Structures in a Light Gravitino Dominated Universe
We analyse the formation of cosmic structures in models where the dark matter
is dominated by light gravitinos with mass of eV -- 1 keV, as predicted
by gauge-mediated supersymmetry (SUSY) breaking models. After evaluating the
number of degrees of freedom at the gravitinos decoupling (), we compute
the transfer function for matter fluctuations and show that gravitinos behave
like warm dark matter (WDM) with free-streaming scale comparable to the galaxy
mass scale. We consider different low-density variants of the WDM model, both
with and without cosmological constant, and compare the predictions on the
abundances of neutral hydrogen within high-redshift damped Ly-- systems
and on the number density of local galaxy clusters with the corresponding
observational constraints. We find that none of the models satisfies both
constraints at the same time, unless a rather small value (\mincir
0.4) and a rather large Hubble parameter (\magcir 0.9) is assumed.
Furthermore, in a model with warm + hot dark matter, with hot component
provided by massive neutrinos, the strong suppression of fluctuation on scales
of \sim 1\hm precludes the formation of high-redshift objects, when the
low-- cluster abundance is required. We conclude that all different variants
of a light gravitino DM dominated model show strong difficulties for what
concerns cosmic structure formation.
This gives a severe cosmological constraint on the gauge-mediated SUSY
breaking scheme.Comment: 28 pages,Latex, submitted for publication to Phys.Rev.
Supersymmetric Dark Matter
There is almost universal agreement among astronomers that most of the mass
in the Universe and most of the mass in the Galactic halo is dark. Many lines
of reasoning suggest that the dark matter consists of some new, as yet
undiscovered, weakly-interacting massive particle (WIMP). There is now a vast
experimental effort being surmounted to detect WIMPS in the halo. The most
promising techniques involve direct detection in low-background laboratory
detectors and indirect detection through observation of energetic neutrinos
from annihilation of WIMPs that have accumulated in the Sun and/or the Earth.
Of the many WIMP candidates, perhaps the best motivated and certainly the most
theoretically developed is the neutralino, the lightest superpartner in many
supersymmetric theories. We review the minimal supersymmetric extension of the
Standard Model and discuss prospects for detection of neutralino dark matter.
We review in detail how to calculate the cosmological abundance of the
neutralino and the event rates for both direct- and indirect-detection schemes,
and we discuss astrophysical and laboratory constraints on supersymmetric
models. We isolate and clarify the uncertainties from particle physics, nuclear
physics, and astrophysics that enter at each step in the calculation. We
briefly review other related dark-matter candidates and detection techniques.Comment: The complete postscript file is available at
ftp://ftp.npac.syr.edu/pub/users/jungman/susyreview/susyreview.ps.Z The TeX
source and figures (plain TeX; macros included) are at
ftp://ftp.npac.syr.edu/pub/users/jungman/susyreview/susyreview.tar.Z Full
paper NOT submitted to lanl archive: table of contents only. To appear in
Physics Report
First limit on WIMP cross section with low background CsI(Tl) crystal detector
The Korea Invisible Mass Search (KIMS) collaboration has been carrying out
WIMP search experiment with CsI(T)crystal detectors at the YanYang
Underground Laboratory. A successful reduction of the internal background of
the crystal is done and a good pulse shape discrimination is achieved. We
report the first result on WIMP search obtained with 237 kgdays data
using one full-size CsI(T)crystal of 6.6 kg mass.Comment: 16 pages, 9 figures, submitted to Physics Letters
Non-Gaussianity in the WMAP data using the peak-peak correlation function
We present a search for non-Gaussianity in the WMAP first-year data using the
two-point correlation function of maxima and minima in the temperature map. We
find evidence for non-Gaussianity on large scales, whose origin appears to be
associated with unsubstracted foregrounds, but which is not entirely clear. The
signal appears to be associated most strongly with cold spots, and is more
pronounced in the Southern galactic hemisphere. Removal of the region of sky
near the galactic plane, or filtering out large-scale modes removes the signal.
Analysis of individual frequency maps shows strongest signal in the 41GHz Q
band. A study of difference maps tests the hypothesis that the non-Gaussianity
is due to residual foregrounds and noise, but shows no significant detection.
We suggest that the detection is due to large-scale residual foregrounds
affecting more than one frequency band, but a primordial contribution from the
Cosmic Microwave Background cannot be excluded.Comment: 12 pages, 17 figures; replaced by accepted version for publication in
MNRAS; some clarifications and references added and some figures changed;
basic conclusions unchange