41 research outputs found
Brown-Henneaux's Canonical Approach to Topologically Massive Gravity
We analyze the symmetry realized asymptotically on the two dimensional
boundary of AdS_3 geometry in topologically massive gravity, which consists of
the gravitational Chern-Simons term as well as the usual Einstein-Hilbert and
negative cosmological constant terms. Our analysis is based on the conventional
canonical method and proceeds along the line completely parallel to the
original Brown and Henneaux's. In spite of the presence of the gravitational
Chern-Simons term, it is confirmed by the canonical method that the boundary
theory actually has the conformal symmetry satisfying the left and right moving
Virasoro algebras. The central charges of the Virasoro algebras are computed
explicitly and are shown to be left-right asymmetric due to the gravitational
Chern-Simons term. It is also argued that the Cardy's formula for the BTZ black
hole entropy capturing all higher derivative corrections agrees with the
extended version of the Wald's entropy formula. The M5-brane system is
illustrated as an application of the present calculation.Comment: 29 pages, no figure, references adde
Holographic Interface-Particle Potential
We consider two N=4 supersymmetric gauge theories connected by an interface
and the gravity dual of this system. This interface is expressed by a fuzzy
funnel solution of Nahm's equation in the gauge theory side. The gravity dual
is a probe D5-brane in AdS_5 x S^5. The potential energy between this interface
and a test particle is calculated in both the gauge theory side and the gravity
side by the expectation value of a Wilson loop. In the gauge theory it is
evaluated by just substituting the classical solution to the Wilson loop. On
the other hand it is done by the on-shell action of the fundamental string
stretched between the AdS boundary and the D5-brane in the gravity. We show the
gauge theory result and the gravity one agree with each other.Comment: 18 pages, 3 figures. v2: added discussion on perturbative corrections
in the gauge theory sid
The energy spectrum of forward photons measured by the RHICf experiment in sqrt{s} = 510 GeV proton-proton collisions
The Relativistic Heavy Ion Collider forward (RHICf) experiment aims at understanding the high-energy hadronic interaction by measuring the cross sections of very forward neutral particles in proton-proton collisions at = 510 GeV. For the analysis of the photon measurement, the trigger efficiency and the particle identification performance are studied by using the Monte Carlo simulation data and the experimental data. In the RHICf operation, two kinds of trigger modes (Shower, HighEM) were implemented. The trigger efficiency of the Shower trigger is 100 for photons with the energies more than 20 GeV. The HighEM trigger is designed to detect high energy photons effectively, and the trigger efficiency of the HighEM trigger is 90 for photons with the energies more than 130 GeV. The correction factor for the photon identification is calculated by using the efficiency and purity. It is found that this correction does not make a sizeable effect on the shape of the energy spectrum because the energy dependency of the factor is small
Measurement of very forward particle production at RHIC with √s=510 GeV proton-proton collisions
The Relativistic Heavy Ion Collider forward (RHICf) experiment has measured neutral particles produced in the very forward direction in the √s=510 GeV proton-proton collisions at RHIC in June 2017. The production cross sections of these particles are crucial to understand the hadronic interaction relevant to the air shower development at the cosmic-ray equivalent energy of 1.4×10 eV, just below the energy of the knee. Together with the data at LHC, accelerator data can cover the interaction in the cosmic-ray energy of 10 eV to 10 eV. In addition, RHICf is able to improve the former measurements of single-spin asymmetry in the polarized proton- proton collisions that is sensitive to the fundamental process of the meson exchange. Common data taking with the STAR experiment will shed light on the unexplored low mass diffraction process
Beam and SKS spectrometers at the K1.8 beam line
High-resolution spectrometers for both incident beams and scattered particles have been constructed at the K1.8 beam line of the Hadron Experimental Facility at J-PARC. A point-to-point optics is realized between the entrance and exit of QQDQQ magnets for the beam spectrometer. Fine-pitch wire chamber trackers and hodoscope counters are installed in the beam spectrometer to accept a high rate beam up to 107 Hz. The superconducting kaon spectrometer for scattered particles was transferred from KEK with modifications to the cryogenic system and detectors. A missing-mass resolution of 1.9 ± 0.1 MeV/c2 (FWHM) was achieved for the ∑ peaks of (π±, K+) reactions on a proton target in the first physics run of E19 in 2010
Long-Term Follow-up of Erythrocyte Porphobilinogen Deaminase Activity in a Patient With Acute Intermittent Porphyria: The Relationship between the Enzyme Activity and Abdominal Pain Attacks
The relationship between the onset of abdominal pain attack and the urinary levels
of δ-aminolevulinic acid, porphobilinogen, uroporphyrin, and the activity of erythrocyte
porphobilinogen deaminase was studied on a monthly basis over a four-year period in a
29-year-old male patient with acute intermittent porphyria.
A close relationship is seen between the onset of pain episodes and sharp decreases of
porphobilinogen deaminase activity. The activity normalizes as the patient improves, suggesting
that this enzyme is a more sensitive monitor for acute intermittent porphyria attacks than the
urinary parameters currently used for its diagnosis.
Our results suggest that month-by-month testing of porphobilinogen deaminase activity in
acute intermittent porphyria patients is a good practice to predict episodes of acute abdominal
pain before its onset, also allowing estimation of possible promoting factors and in establishing
optimal specific therapies