Numerical study on the correlation between CP violation in neutrino oscillations and baryogenesis

We numerically study the correlation between CP violation in the neutrino oscillations and baryogenesis in the seesaw model. In this study we get the heavy Majorana neutrino masses and lepton number asymmetries from their decays by fitting the data of neutrino oscillations and by working on some hypothesis of the Dirac-Yukawa term for neutrinos.Comment: 3 pages, 2 figures, Latex, presented at KEKTC5(Nov. 2001), to be published in Nucl. Phys. Proc. Supp

Magnetic incommensurability in pp-type cuprate perovskites

For the superconducting phase with a d-wave order parameter and zero temperature the magnetic susceptibility of the t-J model is calculated using the Mori projection operator technique. Conditions for the appearance of an incommensurate magnetic response below the resonance frequency are identified. A fast decay of the tails of the hole coherent peaks and a weak intensity of the hole incoherent continuum near the Fermi level are enough to produce an incommensurate response using different hole dispersions established for $p$-type cuprates, in which such response was observed. In this case, the nesting of the itinerant-electron theory or the charge modulation of the stripe theory is unnecessary for the incommensurability. The theory reproduces the hourglass dispersion of the susceptibility maxima with their location in the momentum space similar to that observed experimentally. The upper branch of the dispersion stems from the excitations of localized spins, while the lower one is due to the incommensurate maxima of their damping. The narrow and intensive resonance peak arises if the frequency of these excitations at the antiferromagnetic momentum lies below the edge of the two-fermion continuum; otherwise the maximum is broad and less intensive.Comment: 22 pages, 7 figure

Single spin- and chiral-glass transition in vector spin glasses in three-dimensions

Results of Monte Carlo simulations of XY and Heisenberg spin glass models in three dimensions are presented. A finite size scaling analysis of the correlation length of the spins and chiralities of both models shows that there is a single, finite-temperature transition at which both spins and chiralities order.Comment: 5 pages, 5 figures. Replaced by published versio

Parisi States in a Heisenberg Spin-Glass Model in Three Dimensions

We have studied low-lying metastable states of the $\pm J$ Heisenberg model in two ($d=2$) and three ($d=3$) dimensions having developed a hybrid genetic algorithm. We have found a strong evidence of the occurrence of the Parisi states in $d=3$ but not in $d=2$. That is, in $L^d$ lattices, there exist metastable states with a finite excitation energy of $\Delta E \sim O(J)$ for $L \to \infty$, and energy barriers $\Delta W$ between the ground state and those metastable states are $\Delta W \sim O(JL^{\theta})$ with $\theta > 0$ in $d=3$ but with $\theta < 0$ in $d=2$. We have also found droplet-like excitations, suggesting a mixed scenario of the replica-symmetry-breaking picture and the droplet picture recently speculated in the Ising SG model.Comment: 4 pages, 6 figure

Softening of Cu-O bond stretching phonon in tetragonal HgBa2_2CuO4+δ_{4+\delta}

Phonons in nearly optimally doped HgBa$_2$CuO$_{4+\delta}$ were studied by inelastic X-ray scattering. The dispersion of the low energy modes is well described by a shell model, while the Cu-O bond stretching mode at high energy shows strong softening towards the zone boundary, which deviates strongly from the model. This seems to be common in the hole-doped high-$T_\mathrm{c}$ superconducting cuprates, and, based on this work, not related to a lattice distortion specific to each material.Comment: 5 pages, 4 figures, accepted for publication in Phys. Rev. Let

Dispersion of Magnetic Excitations in Superconducting Optimally Doped YBa_2Cu_3O_6.95

Detailed neutron scattering measurements of YBa_2Cu_3O_6.95 found that the resonance peak and incommensurate magnetic scattering induced by superconductivity represent the same physical phenomenon: two dispersive branches that converge near 41 meV and the in-plane wave-vector q_af=(pi/a, pi/a) to form the resonance peak. One branch has a circular symmetry around q_af and quadratic downward dispersion from ~41 meV to the spin gap of 33+-1meV. The other, of lower intensity, disperses from ~41 meV to at least 55 meV. Our results exclude a quartet of vertical incommensurate rods in q-w space expected from spin waves produced by dynamical charge stripes as an origin of the observed incommensurate scattering in optimally-doped YBCO.Comment: Version 3: Author change. Changes made throughout the text and minor changes in figures, Model parameters slightly changed after a small error in the calculation was discovere

ANALISIS TITIK IMPAS USAHA TERNAK AYAM RAS PETELUR “DHARMA GUNAWAN”DI KELURAHAN PANIKI BAWAH KECAMATAN MAPANGET KOTA MANADO (STUDI KASUS)

ABSTRAKPenelitian dilaksanakan di Kota Manado, pada perusahaan peternakan Ayam Ras Petelur Dharma Gunawan yang berlokasi di Kelurahan Paniki Bawah Kecamatan Mapanget.Masalah dalam penelitian ini adalah berapa besar tercapainya titik impas dan berapa besar keuntungan usaha ternak ayam ras petelur Dharma Gunawan. Tujuan penelitian adalah untuk mengetahui titik impas dan keuntungan usaha ternak ayam ras petelur Dharma Gunawan. Metode penelitian yang digunakan adalah metode studi kasus. Data diperoleh melalui wawancara secara langsung kepada peternak dengan menggunakan kuesioner. Model analisis yang digunakan yaitu model analisis deskriptif dengan cara verbal dan matematis. Cara verbal adalah cara yang menggunakan kata-kata untuk menerangkan sesuatu hal, sedangkan cara matematis dengan menggunakan analisis titik impas.Penelitian dilakukan pada satu periode produksi, menunjukkan bahwa dalam pengalokasian biaya menyangkut biaya tetap total sebesar Rp 413.793.300,-, dan biaya variabel total sebesar Rp 6.298.040.700,- sedangkan penerimaan total sebesar Rp 9.019.195.160, sehingga keuntungan usaha ternak ayam ras petelur sebesar Rp 2.307.361.460,-. Kesimpulan penelitian ini yaitu titik impas tercapai pada unit 1.877.804,51 dan penerimaan sebesar Rp 1.799.100.000,- dari hasil penjualan telur rata-rata. Usaha ternak ayam petelur Dharma Gunawan prospektif dan menguntungkan. Kata Kunci:Analisis, Titik Impas, Usaha Ternak Ayam Ras Petelur ABSTRACTBREAK EVEN POINT ANALYSISLIVESTOCK BUSINESS LAYING CHICKEN “DHARMA GUNAWAN” IN PANIKI BAWAH VILLAGE MAPANGET DISTRICT MANADO CITY(CASE STUDY). The study was conducted in the Dharma Gunawan layer chicken farm. The farm is a poultry farm business in the city of Manado, located in Paniki Bawah, Mapanget District. The problem in this study is howbreakeven and profit achievement of Dharma Gunawan layer chicken farm. The research objective was to determine the break-even point and profit of Dharma Gunawan layer chicken farm. The research method used is case study method. Dataobtained through direct interviews with farmer using a questionnaire. The analysis model used in the study is a descriptive analysis of verbal and mathematical way models. Verbal is the way how to use words to explain something, while mathematical way is the way of breakeven analysis. The study on allocation of costs and profitwas calculated in a production period on the chicken layer farm, showed that involves fixed costs total is Rp 413 793 300,-, total variable costs is Rp 6,298,040,700,- and total revenue is Rp 9,019,195,160,-, so profitof Dharma Gunawan chicken layer farm is Rp 2.307.361.460,-. The conclusion are reached breakeven in units is 1,877,804.51 and in revenue is Rp 1.7991 billion,- from the average sale of eggs. The Dharma Gunawan layer chicken farm is prospective and profitable. Keywords: Analysis, Break Even Point, Layer Chicken Far