1,916 research outputs found
Solitonic generation of five-dimensional black ring solution
Using the solitonic solution-generating technique we rederived the
one-rotational five-dimensional black ring solution found by Emparan and Reall.
The seed solution is not the Minkowski metric, which is the seed of
-rotating black ring. The obtained solution has more parameters than the
Emparan and Reall's -rotating black ring. We found the conditions of
parameters to reduce the solution to the -rotating black ring. In addition
we examined the relation between the expressions of the metric in the
prolate-spheroidal coordinates and in the canonical coordinates.Comment: 5 pages, 4 figures ; accepted version, several details are remove
All Optical Measurement Proposed for the Photovoltaic Hall Effect
We propose an all optical way to measure the recently proposed "photovoltaic
Hall effect", i.e., a DC Hall effect induced by a circularly polarized light in
the absence of static magnetic fields. For this, we have calculated the Faraday
rotation angle induced by the photovoltaic Hall effect with the Kubo formula
extended for photovoltaic optical response in the presence of strong AC
electric fields treated with the Floquet formalism. We also point out the
possibility of observing the effect in three-dimensional graphite, and more
generally in multi-band systems such as materials described by the dp-model.Comment: 5 page
Y-type Flux-Tube Formation and Gluonic Excitations in Baryons: From QCD to Quark Model
Using SU(3) lattice QCD, we perform the first systematic study for the
ground-state three-quark (3Q) potential and the 1st
excited-state 3Q potential , {\it i.e.}, the energies of
the ground state and the 1st excited state of the gluon field in the presence
of the static three quarks. From the accurate and thorough calculation for more
than 300 different patterns of 3Q systems, the static ground-state 3Q potential
is found to be well described by the Coulomb plus
Y-type linear potential, {\it i.e.}, Y-Ansatz, within 1%-level deviation. As a
clear evidence for Y-Ansatz, Y-type flux-tube formation is actually observed on
the lattice in maximally-Abelian projected QCD. For more than 100 patterns of
3Q systems, we calculate the 1st excited-state 3Q potential in quenched lattice QCD, and find the gluonic excitation energy to be about 1
GeV. This large gluonic-excitation energy is conjectured to ensure the success
of the quark model for the low-lying hadrons even without gluonic excitations.Comment: Talk given at International Conference on Color Confinement and
Hadrons in Quantum Chromodynamics - Confinement 2003, RIKEN, Japan, 21-24 Jul
200
Meson-Meson and Meson-Baryon Interactions in Lattice QCD
We study the meson-meson and meson-baryon interactions in lattice QCD. The
simulation is performed on 20^3 * 24 lattice at \beta=5.7 using Wilson gauge
action and Wilson fermion at the quenched level. By adopting one static quark
for each hadron as "heavy-light meson" and "heavy-light-light baryon", we
define the distance of two hadrons and extract the inter-hadron potential
from the energy difference of the two-particle state and its asymptotic state.
We find that both of the meson-meson and meson-baryon potentials are
nontrivially weak for the whole range of 0.2 fm <= r <= 0.8 fm. The effect of
including/excluding the quark-exchange diagrams is found to be marginal.Comment: Talk given at Particles and Nuclei International Conference
(PANIC05), Santa Fe, NM, USA, 24-28 Oct. 2005. 3 pages, 2 figure
Multi-Quarks and Two-Baryon Interaction in Lattice QCD
We study multi-quark (3Q,4Q,5Q) systems in lattice QCD. We perform the
detailed studies of multi-quark potentials in lattice QCD to clarify the
inter-quark interaction in multi-quark systems. We find that all the
multi-quark potentials are well described by the OGE Coulomb plus multi-Y-type
linear potential, i.e., the multi-Y Ansatz. For multi-quark systems, we observe
lattice QCD evidences of ``flip-flop'', i.e., flux-tube recombination. These
lattice QCD studies give an important bridge between elementary particle
physics and nuclear physics.Comment: A talk given at Particles and Nuclei International
Conference(PANIC05), Santa Fe, NM, Oct. 24-28, 2005. 3 pages, 6 figure
Properties of Scalar-Quark Systems in SU(3)c Lattice QCD
We perform the first study for the bound states of colored scalar particles
("scalar quarks") in terms of mass generation with quenched SU(3)
lattice QCD. We investigate the bound states of , and
("scalar-quark hadrons"), as well as the bound states of
and quarks , i.e., , and
("chimera hadrons"). All these new-type hadrons including have a large
mass of several GeV due to large quantum corrections by gluons, even for zero
bare scalar-quark mass at . We find a similar
-dependence between and , which
indicates their similar structure due to the large mass of . From this
study, we conjecture that all colored particles generally acquire a large
effective mass due to dressed gluons
Cyclotron radiation and emission in graphene
Peculiarity in the cyclotron radiation and emission in graphene is
theoretically examined in terms of the optical conductivity and relaxation
rates to propose that graphene in magnetic fields can be a candidate to realize
the Landau level laser, proposed decades ago [H. Aoki, Appl. Phys. Lett. {\bf
48}, 559 (1986)].Comment: 4 pages, 3 figure
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