5,819 research outputs found
Structure in Supersymmetric Yang-Mills Theory
We show that requiring sixteen supersymmetries in quantum mechanical gauge
theory implies the existence of a web of constrained interactions. Contrary to
conventional wisdom, these constraints extend to arbitrary orders in the
momentum expansion.Comment: 22 pages, LaTe
Smearing Effect in Plane-Wave Matrix Model
Motivated by the usual D2-D0 system, we consider a configuration composed of
flat membrane and fuzzy sphere membrane in plane-wave matrix model, and
investigate the interaction between them. The configuration is shown to lead to
a non-trivial interaction potential, which indicates that the fuzzy sphere
membrane really behaves like a graviton, giant graviton. Interestingly, the
interaction is of r^{-3} type rather than r^{-5} type. We interpret it as the
interaction incorporating the smearing effect due to the fact that the
considered supersymmetric flat membrane should span and spin in four
dimensional subspace of plane-wave geometry.Comment: 26 pages; added referenc
Spin Polarization in at Low Energies with a Pionless Effective Field Theory
With the use of pionless effective field theory including dibaryon fields, we
study the reaction for the laboratory photon energy
ranging from threshold to 30 MeV. Our main goal is to
calculate the neutron polarization defined as , where and are the
differential cross sections for the spin-up and spin-down neutrons,
respectively, along the axis perpendicular to the reaction plane. We also
calculate the total cross section as well as the differential cross section
, where is the colatitude angle. Although the results
for the total and differential cross sections are found to agree reasonably
well with the data, the results for show significant discrepancy with
the experiment. We comment on this discrepancy.Comment: 15 pages, 7 figures, discussion about di-baryon formalism detailed,
minor corrections, accepted for publication in Phys. Rev.
Giant Gravitons in type IIA PP-wave Background
We examine giant gravitons with a worldvolume magnetic flux in type IIA
pp-wave background and find that they can move away from the origin along
direction in target space satisfying . This nontrivial relation can be
regarded as a complementary relation of the giant graviton on IIA pp-wave and
is shown to be connected to the spacetime uncertainty principle. The giant
graviton is also investigated in a system of N D0-branes as a fuzzy sphere
solution. It is observed that enters into the fuzzy algebra as a
deformation parameter. Such a background dependent Myers effect guarantees that
we again get the crucial relation of our giant graviton. In the paper, we also
find a BIon configuration on the giant graviton in this background.Comment: 10 pages, no figure, content added, typo corrected, reference adde
Cold Dense Baryonic Matter and Compact Stars
Probing dense hadronic matter is thus far an uncharted field of physics. Here
we give a brief summary of the highlights of what has been so far accomplished
and what will be done in the years ahead by the World Class University III
Project at Hanyang University in the endeavor to unravel and elucidate the
multifacet of the cold dense baryonic matter existing in the interior of the
densest visible stable object in the Universe, i.e., neutron stars, strangeness
stars and/or quark stars, from a modest and simplified starting point of an
effective field theory modeled on the premise of QCD as well as from a gravity
dual approach of hQCD. The core of the matter of our research is the possible
origin of the of the proton mass that is to be accounted for and how
the "vacuum" can be tweaked so that the source of the mass generation can be
uncovered by measurements made in terrestrial as well as space laboratories.
Some of the issues treated in the program concern what can be done - both
theoretically and experimentally - in anticipation of what's to come for basic
physics research in Korea.Comment: 23 pages, 8 figures; Based on the review prepared for the "2011 World
Class University (WCU) International Conference," August 2011, Seoul, Kore
A Study of Overall Tribological Problems in Developing R407c Rotary Compressor with Polyolester Oils
Hadron Masses in Medium and Neutron Star Properties
We investigate the properties of the neutron star with relativistic mean
field models. We incorporate in the quantum hadrodynamics and in the
quark-meson coupling models a possible reduction of meson masses in nuclear
matter. The equation of state for neutron star matter is obtained and is
employed in Oppenheimer-Volkov equation to extract the maximum mass of the
stable neutron star. We find that the equation of state, the composition and
the properties of the neutron stars are sensitive to the values of the meson
masses in medium.Comment: 18 pages, 5 figures and 2 tables. To be published in EPJ
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