We present Far Ultraviolet Spectroscopic Explorer (FUSE) and Space Telescope Imaging Spectrograph observations of the weak interstellar N I λ1160 doublet toward 17 high-density sightlines [N(Htot) ≥ 10 21 cm]. When combined with published data, our results reveal variations in the fractional N I abundance showing a systematic deficiency at large N(Htot). At the FUSE resolution (∼ 20 km s) the e...

Let Σ = Σg be a compact Riemann surface of genus g ≥ 2 and let MΣ stand for the moduli space of rank two stable vector bundles on Σ with odd (and fixed) determinant. In [5] the author produced a presentation for the quantum cohomology ring QH(MΣ) in terms of its natural generators by giving the relations satisfied by them. Here we want to show that this information yields all the multiple-point...

We use observations of the radial profiles of the mass surface density of total, Σg, and molecular, ΣH2, gas, rotation velocity and star formation rate surface density, Σsfr, of the molecular dominated regions of 12 disk galaxies from Leroy et al. to test several star formation laws: a “Kennicutt power law”, Σsfr = AgΣ 1.5 g,2; a “Constant molecular law”, Σsfr = AH2ΣH2,2; the “Turbulence-regula...

Topology change in quantum gravity is considered. An exact wave function of the Universe is calculated for topological Chern-Simons 2+1 dimensional gravity. This wave function occurs as the effect of a quantum anomaly which leads to the induced gravity. We find that the wave function depends universally on the topology of the two-dimensional space. Indeed, the property of the ground state wave ...

The values of the Witten invariants, IW , of the lens space L(p, 1) for SU(2) at level k are obtained for arbitrary p. A duality relation for IW when p and k are interchanged, valid for asymptotic k, is observed. A method for calculating IW for any group G is described. It is found that IW for Zm, even for m = 2, distinguishes 3-manifolds quite effectively. Recently a class of topological invar...

Central to all clostridia is the orchestration of endospore formation (i.e., sporulation) and, specifically, the roles of differentiation-associated sigma factors. Moreover, there is considerable applied interest in understanding the roles of these sigma factors in other stationary-phase phenomena, such as solvent production (i.e., solventogenesis). Here we separately inactivated by gene disrup...

We measure the power spectrum of galaxy clustering in real space from the APM Galaxy Survey. We present an improved technique for the numerical inversion of Limber’s equation that relates the angular clustering of galaxies to an integral over the power spectrum in three dimensions. Our approach is underpinned by a large ensemble of mock galaxy catalogues constructed from the Hubble Volume N-bod...

We determine the evolution from z = 3 → 0 of the galaxy and mass correlation functions and bias factor in a 50hMpc ΛCDM hydrodynamic simulation with 10hkpc resolution. The mass correlation function grows with time, but the galaxy correlation function shows little evolution and is well described by a power law. At early times, galaxies are biased traces of mass, with bias being higher on smaller...

We have measured the double-to-single photoionization ratio of atomic lithium and beryllium using the ion time-of-flight method. The photon beam of the PGM undulator beam line ionizes the vaporized target atoms. The ions created are extracted by a pulsed electric field across the interaction region and are detected by a Z-stack of micro-channel plates [1]. In the figure shown above, we compare ...

We measure the power spectrum of galaxy clustering in real space from the APM Galaxy Survey. We present an improved technique for the numerical inversion of Limber’s equation that relates the angular clustering of galaxies to an integral over the power spectrum in three dimensions. Our approach is underpinned by a large ensemble of mock galaxy catalogues constructed from the Hubble Volume N-bod...