Rotation Curves of Spiral Galaxies and Large Scale Structure of Universe under Generalized Einstein Action

We consider an addition of the term which is a square of the scalar curvature to the Einstein-Hilbert action. Under this generalized action, we attempt to explain i) the flat rotation curves observed in spiral galaxies, which is usually attributed to the existence of dark matter, and ii) the contradicting observations of uniform cosmic microwave background and non-uniform galaxy distributions against redshift. For the former, we attain the flatness of velocities, although the magnitudes remain about half of the observations. For the latter, we obtain a solution with oscillating Hubble parameter under uniform mass distributions. This solution leads to several peaks of galaxy number counts as a function of redshift with the first peak corresponding to the Great Wall.Comment: 16 page

Magnetic-field effects on the in-plane electrical resistivity in the single-crystal La2−x_{2-x}Bax_xCuO4_4 and La1.6−x_{1.6-x}Nd0.4_{0.4}Srx_xCuO4_4 around x=1/8x=1/8: Relating to the field-induced stripe order

Temperature dependence of the in-plane electrical resistivity, $\rho_{\rm ab}$, in various magnetic fields has been measured in the single-crystal La$_{2-x}$Ba$_x$CuO$_4$ with $x=0.08$, 0.10, 0.11 and La$_{1.6-x}$Nd$_{0.4}$Sr$_x$CuO$_4$ with $x=0.12$. It has been found that the superconducting transition curve shows a so-called fan-shape broadening in magnetic fields for $x=0.08$, while it shifts toward the low-temperature side in parallel with increasing field for $x=0.11$ and 0.12 where the charge-spin stripe order is formed at low temperatures. As for $x=0.10$, the broadening is observed in low fields and it changes to the parallel shift in high fields above 9 T. Moreover, the normal-state value of $\rho_{\rm ab}$ at low temperatures markedly increases with increasing field up to 15 T. It is possible that these pronounced features of $x=0.10$ are understood in terms of the magnetic-field-induced stabilization of the stripe order suggested from the neutron-scattering measurements in the La-214 system. The $\rho_{\rm ab}$ in the normal state at low temperatures has been found to be proportional to ln(1/$T$) for $x=0.10$, 0.11 and 0.12. The ln(1/$T$) dependence of $\rho_{\rm ab}$ is robust even in the stripe-ordered state.Comment: 6 pages, 4 figures, ver. 2 has been accepted for publication in Phys. Rev.

Vibrationally resolved partial cross sections and asymmetry parameters for carbon K-shell photoionization of the CO_2 molecule

We have measured the vibrationally resolved partial cross sections \sigma_{v_1^{\prime}} and asymmetry parameters \beta_{v_1^{\prime}} for C K-shell photoionization of the CO2 molecule in the Σu shape resonance region above the C K-shell ionization threshold. The positions of both the maxima of \sigma_{v_1^{\prime}} and the minima of \beta_{v_1^{\prime}} move towards the C K-shell threshold with increasing symmetric stretching vibrational excitation v'1 in the C 1s single-hole state. Calculations employing the relaxed-core Hartree–Fock approach reproduce the observed vibrational effects

Preparation and mechanical properties of machinable alumina/mica composites

ArticleJOURNAL OF THE EUROPEAN CERAMIC SOCIETY. 26(9): 1687 -1693 (2006)journal articl

Waste on the roadside, 'poi-sute' waste: Its distribution and elution potential of pollutants into environment

ArticleWASTE MANAGEMENT. 29(3):1192-1197 (2009)journal articl

Low-temperature sintering of Z-type hexagonal ferrite by addition of fluorine containing glass powder

The original publication is available at www.springerlink.com.ArticleJOURNAL OF MATERIALS SCIENCE. 40(1): 165-170 (2005)journal articl

Effect of layer charge on chemical and physical properties of synthetic K-fluorine micas

The original publication is available at www.springerlink.com.ArticleJOURNAL OF MATERIALS SCIENCE. 40(21): 5597-5602 (2005)journal articl

New synthetic method and ionic conductivity of Na-4-mica

ArticleMATERIALS LETTERS. 60(4): 464-466 (2006)journal articl

Preparation of M-0 metal/alumina-pillared mica composites (M = Cu, Ni) by in situ reduction of interlayer M2+ ions of alumina-pillared fluorine micas

ArticleMATERIALS RESEARCH BULLETIN. 42(12): 2143-2149 (2007)journal articl

Crystallization process and some properties of novel transparent machinable calcium-mica glass-ceramics

ArticleCERAMICS INTERNATIONAL. 34(1): 75-79 (2008)journal articl