Recent Submissions

  • Detection in Hα of a Supershell Associated with W4 

    Dennison, B.; Topasna, G. A.; Simonetti, J. H. (IOP PUBLISHING LTD, 1997-01)
    From H I observations, Normandeau, Taylor, & Dewdney have identified a possible Galactic chimney emanating from W4. We observed a 10 degrees diameter field centered on this region in the Her line using a CCD camera sensitive ...
  • A Water Maser Flare in W49N: Amplification by a Rotating Foreground Cloud 

    Boboltz, D. A.; Simonetti, J. H.; Dennison, B.; Diamond, P. J.; Uphoff, J. A. (IOP PUBLISHING LTD, 1998-12)
    We monitored the 22 GHz H2O maser emission toward W49N from December 1989 through May 1990. During this period we observed an outburst in a component at -66.25 km s(-1). The flux density of the flaring component increased ...
  • The Contribution Of Galactic Free-Free Emission to Anisotropies in the Cosmic Microwave Background Found by the Saskatoon Experiment 

    Simonetti, J. H.; Dennison, B.; Topasna, G. A. (IOP PUBLISHING LTD, 1996-02)
    We made a sensitive, wide-field Ha image of the north celestial polar region. Using this image, we constrain the contribution of irregularities in interstellar free-free emission to the degree-scale anisotropies in the ...
  • 14-year program monitoring the flux densities of 33 radio sources at low frequencies 

    Salgado, J. F.; Altschuler, D. R.; Ghosh, T.; Dennison, B. K.; Mitchell, K. J.; Payne, H. E. (IOP PUBLISHING LTD, 1999-01)
    We present the results of a low-frequency flux density monitoring program of 33 extragalactic radio sources. The light curves at 318 and 430 MHz over a 14 yr period are presented. The measurements were made with the NAIC ...
  • The Extreme Scattering Event toward PKS 1741-038: VLBI Images 

    Lazio, T. J. W.; Fey, A. L.; Dennison, B.; Mantovani, F.; Simonetti, J. H.; Alberdi, A.; Foley, A. R.; Fiedler, R.; Garrett, M. A.; Hirabayashi, H.; Jauncey, D. L.; Johnston, K. J.; Marcaide, J.; Migenes, V.; Nicolson, G. D.; Venturi, T. (IOP PUBLISHING LTD, 2000-05)
    We report multiepoch VLBI observations of the source PKS 1741-038 (OT 068) as it underwent an extreme scattering event (ESE). Observations at four epochs were obtained, and images were produced at three of these. One of ...
  • Galactic Foregrounds in Owens Valley Radio Observatory and UCSB South Pole 1994 Cosmic Microwave Background Anisotropy Data 

    Mukherjee, P.; Dennison, B.; Ratra, B.; Simonetti, J. H.; Ganga, K.; Hamilton, J. C. (IOP PUBLISHING LTD, 2002-11)
    We study Galactic emission foreground contamination of the Owens Valley Radio Observatory and UCSB South Pole 1994 cosmic microwave background anisotropy data by cross-correlating with templates of infrared dust emission ...
  • Hydrogen-atom spectrum under a minimal-length hypothesis 

    Benczik, S.; Chang, L. N.; Minic, D.; Takeuchi, T. (American Physical Society, 2005-07)
    The energy spectrum of the Coulomb potential with minimal length commutation relations [X-i, P-j] = ih{delta ij(1 + beta P-2) + beta PiPj} is determined both numerically and perturbatively for arbitrary values of beta'/beta ...
  • Background independent quantum mechanics and gravity 

    Minic, D.; Tze, C. H. (American Physical Society, 2003-09-15)
    We argue that the demand of background independence in a quantum theory of gravity calls for an extension of standard geometric quantum mechanics. We discuss a possible kinematical and dynamical generalization of the latter ...
  • Notes on spacetime thermodynamics and the observer dependence of entropy 

    Marolf, D.; Minic, D.; Ross, S. F. (American Physical Society, 2004-03)
    Because of the Unruh effect, accelerated and inertial observers differ in their description of a given quantum state. The implications of this effect are explored for the entropy assigned by such observers to localized ...
  • Charge assignments in multiple-U(1) gauge theories 

    Loinaz, W.; Takeuchi, T. (American Physical Society, 1999-12-01)
    We discuss the choice of gauge field basis in multiple-U(1) gauge theories. We find that there is a preferred basis, specified by the charge orthogonality condition, in which the U(1) gauge fields do not mix under one-loop ...
  • Monte Carlo simulation calculation of the critical coupling constant for two-dimensional continuum phi(4) theory 

    Loinaz, W.; Willey, R. S. (American Physical Society, 1998-10)
    We perform a Monte Carlo simulation calculation of the critical coupling constant for the continuum two-dimensional (lambda/4) phi(4) theory. The critical coupling constant we obtain is [lambda/mu(2)](crit) = 10.26(-.04)(+.08). ...
  • Constraints on R-parity violating couplings from CERN LEP and SLAG SLD hadronic observables 

    Lebedev, O.; Loinaz, W.; Takeuchi, T. (American Physical Society, 2000-07-01)
    We analyze the one loop corrections to hadronic Z decays in an R-parity violating extension to the minimal supersymmetric standard model. Performing a global fit to all the hadronic observables at the Z peak, we obtain ...
  • NuTeV anomaly, neutrino mixing, and a heavy Higgs boson 

    Loinaz, W.; Okamura, N.; Takeuchi, T.; Wijewardhana, L. C. R. (American Physical Society, 2003-04)
    Recent results from the NuTeV experiment at Fermilab and the deviation of the Z invisible width, measured at CERN LEP and the SLAC Linear Collider, from its standard model (SM) prediction suggest the suppression of neutrino-Z ...
  • Constraints on R-parity violating couplings from lepton universality 

    Lebedev, O.; Loinaz, W.; Takeuchi, T. (American Physical Society, 2000-07-01)
    We analyze the one loop corrections to leptonic W and Z decays in an R-parity violating extension to the minimal supersymmetric standard model. We find that lepton universality violation in the Z line-shape variables alone ...
  • Glueball spectrum of pure Yang-Mills theory in 2+1 dimensions 

    Leigh, R. G.; Minic, D.; Yelnikov, A. (American Physical Society, 2007-09)
    We present details of the analytic computation of the spectrum of lowest spin glueballs in pure Yang-Mills theory in 2+1 dimensions. The new ingredient is provided by the conjectured new nontrivial expression for the ...
  • Quark-lepton unification and lepton flavor nonconservation from a TeV-scale seesaw neutrino mass texture 

    Loinaz, W.; Okamura, N.; Rayyan, S.; Takeuchi, T.; Wijewardhana, L. C. R. (American Physical Society, 2003-10-01)
    In a recent paper we pointed out that the mixing of the light neutrinos with heavy gauge singlet states could reconcile the Z-pole data from e(+)e(-) colliders and the nu(mu) ((nu) over bar (mu)) scattering data from the ...
  • NuTeV anomaly, lepton universality, and nonuniversal neutrino-gauge couplings 

    Loinaz, W.; Okamura, N.; Rayyan, S.; Takeuchi, T.; Wijewardhana, L. C. R. (American Physical Society, 2004-12)
    In previous studies we found that models with flavor-universal suppression of the neutrino-gauge couplings are compatible with NuTeV and Z-pole data. In this paper we expand our analysis to obtain constraints on flavor-dependent ...
  • alpha-states in de Sitter space 

    de Boer, J.; Jejjala, V.; Minic, D. (American Physical Society, 2005-02)
    Field theory in de Sitter space admits a one-parameter family of vacua determined by a superselection parameter alpha. Of these vacua, the Euclidean vacuum uniquely extrapolates to the vacuum of flat Minkowski space. States ...
  • Leptonic CP violation search and the ambiguity of delta m(31)(2) 

    Koike, M.; Okamura, N.; Saito, M.; Takeuchi, T. (American Physical Society, 2006-03)
    We consider a search for the CP-violating angle delta(CP) in long baseline neutrino oscillation experiments. We show that the subleading delta(CP)-dependent terms in the nu(mu)->nu(e) oscillation probability can be easily ...
  • Quantum gravity, torsion, parity violation, and all that 

    Freidel, L.; Minic, D.; Takeuchi, T. (American Physical Society, 2005-11)
    We discuss the issue of parity violation in quantum gravity. In particular, we study the coupling of fermionic degrees of freedom in the presence of torsion and the physical meaning of the Immirzi parameter from the viewpoint ...

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