Nuclear G-Matrix Elements from Nonlocal Potentials

We study effects of nonlocality in the nuclear force on the G-matrix elements for finite nuclei. Nuclear G-matrix elements for \O16 are calculated in the harmonic oscillator basis from a nonlocal potential which models quark exchange effects between two nucleons. We employ a simple form of potential that gives the same phase shifts as a realistic local nucleon potential. The G-matrix elements calculated from the nonlocal potential show moderate increase in repulsion from those derived from the local potential.Comment: 11 page, LaTeX, 2 PS figures, uses epsf.st

Numerical Simulation of the Surface Flow on the Companion Star in a Close Binary System II. Construction of Doppler maps and application to Galactic supersoft X-ray sources

We perform three-dimensional numerical simulations of surface flows on the companion star in a semi-detached binary system and construct the corresponding Doppler maps. The mass ratio of the binary system, $q=M_2/M_1$, considered here is $q=0.05, 0.33, 0.5, 1, 2$, and 3. For all cases, we obtain the H-, L1-, and L2-eddies, as found in our previous work, and confirm that the flow pattern does not heavily depend on the mass ratio. We propose that this kind of problem be dubbed ``{\it stellar meteorology}.'' The Doppler maps at the position of the companion show a structure tilted towards clockwise direction and presenting deviations from the critical Roche surface due to the L1-eddy and the L2-eddy on the companion star. We apply our results to the Galactic supersoft X-ray source RX J0019.8+2156 and try to attribute the low radial velocity component of the emission lines of He II ${\lambda}4686$ observed recently to the irradiated spot on the surface of the companion rather than that of the white dwarf or the accretion disc. Based on the comparison between the observations and our constructed Doppler map, we estimate the mass of the companion star in RX J0019.8+2156 to be $\sim 2 M_{\odot}$ assuming the mass of the white dwarf star to be around $0.6 M_{\odot}$.Comment: 8 pages, 9 figures, Accepted for publication in A&

Can lattice data for two heavy-light mesons be understood in terms of simply two-quark potentials?

By comparing lattice data for the two heavy-light meson system (Q^2 qbar^2) with a standard many-body approach employing only interquark potentials, it is shown that the use of unmodified two-quark potentials leads to a gross overestimate of the binding energy.Comment: Contribution to LATTICE99 (Heavy Quarks). 3 pages, 2 ps figure

Mixings of 4-quark components in light non-singlet scalar mesons in QCD sum rules

Mixings of 4-quark components in the non-singlet scalar mesons are studied in the QCD sum rules. We propose a formulation to evaluate the cross correlators of q\bar q and qq\bar q \bar q operators and to define the mixings of different Fock states in the sum rule. It is applied to the non-singlet scalar mesons, a_0 and K_0^\ast. It is found that the 4-quark operators predict lower masses than the q\bar q operators and that the 4-quark states occupy about 70-90% of the lowest mass states.Comment: 8 pages, 9 figure

Are the anti-charmed and bottomed pentaquarks molecular heptaquarks?

I study the charmed $uudd\bar c$ resonance D*p (3100) very recently discovered by the H1 collaboration at Hera. An anticharmed resonance was already predicted, in a recent publication mostly dedicated to the S=1 resonance Theta+(1540). To confirm these recent predictions, I apply the same standard quark model with a quark-antiquark annihilation constrained by chiral symmetry. I find that repulsion excludes the D*p (3100) as a $uudd\bar c$ s-wave pentaquark. I explore the D*p (3100) as a heptaquark, equivalent to a N-pi-D* linear molecule, with positive parity and total isospin I=0. I find that the N-D repulsion is cancelled by the attraction existing in the N-pi and pi-D channels. In our framework this state is harder to bind than the Theta+ described by a k-pi-N borromean bound-state, a lower binding energy is expected in agreement with the H1 observation. Multiquark molecules N-pi-D, N-pi-B* and N-pi-B are also predicted.Comment: 5 pages, 2 figures, RevTe

Quantum description for a chiral condensate disoriented in a certain direction in isospace

We derive a quantum state of the disoriented chiral condensate dynamically, considering small quantum fluctuations around a classical chiral condensate disoriented in a certain direction $\vec n$ in isospace. The obtained nonisosinglet quantum state has the characteristic features; (i) it has the form of the squeezed state, (ii) the state contains not only the component of pion quanta in the direction $\vec n$ but also the component in the perpendicular direction to $\vec n$ and (iii) the low momentum pions in the state violate the isospin symmetry. With the quantum state, we calculate the probability of the neutral fraction depending on the time and the pion's momentum, and find that the probability has an unfamiliar form. For the low momentum pions, the parametric resonance mechanism works with the result that the probability of the neutral fraction becomes the well known form approximately and that the charge fluctuation is small.Comment: 19 page

Photo-induced Tomonaga-Luttinger-like liquid in a Mott insulator

Photo-induced metallic states in a Mott insulator are studied for the half-filled, one-dimensional Hubbard model with the time-dependent density matrix renormalization group. An irradiation of strong AC field is found to create a linear dispersion in the optical spectrum (current-current correlation) in the nonequilibrium steady state reminiscent of the Tomonaga-Luttinger liquid for the doped Mott insulator in equilibrium. The spin spectrum in nonequilibrium retains the des Cloizeaux-Pearson mode with the spin velocity differing from the charge velocity. The mechanism of the photocarrier-doping, along with the renormalization in the charge velocity, is analyzed in terms of an effective Dirac model.Comment: 5 pages, 5 figure

Uji Efek Penyembuhan Luka Sayat Ekstrak Ikan Toman (Channa Micropeltes) Secara Oral Pada Tikus Jantan Galur Wistar Yang Diinduksi Streptozotocin

Ikan toman (Channa micropeltes) banyak dijumpai di Kalimantan Barat dan masyarakat mengkonsumsinya untuk mempercepat penyembuhan luka. Ikan toman mengandung protein (albumin) dan asam lemak yang dapat mempercepat proses penyembuhan luka sayat. Penelitian ini bertujuan untuk mengetahui efek penyembuhan luka sayat ekstrak ikan toman yang diberikan secara oral pada tikus yang di induksi streptozotocin. Enambelas sampel ekor tikus Wistar di induksi dengan streptozotocin. Setelah dinyatakan diabetes hewan dibagi menjadi kelompok dosis 4 mL/KgBB, dosis 8 mL/KgBB, dosis 16 mL/KgBB tikus dan kontrol negatif. Dalam penelitian ini ditambahkan kelompok normal efek penyembuhan luka yang tidak diinduksi streptozotocin. Tikus diberi luka sayat dan diamati pada hari ke-1, 3, 5, 7, 9, dan 11. Luas area luka diukur dengan program Macbiophotonic Image J. Analisis data menggunakan One Way Anova dan Post Hoc Test. Dari hasil analisis terdapat perbedaan yang signifikan pada hari ke-7 (p<0,05) antara tiap kelompok uji. Hal ini mengindikasikan bahwa pemberian ekstrak ikan toman secara oral memiliki efek penyembuhan. Dosis 16 ml/kg BB memiliki efek penyembuhan luka tercepat dengan rata-rata persentase 96,625% dibandingkan dengan dosis 8 ml/kg BB 93,675%, dosis 4 ml/kg BB tikus 88,675%, kontrol normal 73,475%, dan kontrol negatif 67,575% pada hari ke-11