Now showing items 1-20 of 33

    • 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 ...
    • 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 ...
    • 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 ...
    • 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 ...
    • Charge assignments in multiple-U(1) gauge theories 

      Loinaz, W; Takeuchi, T (American Physical Soc, 1999-12-01)
    • 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 ...
    • Classical Implications of the Minimal Length Uncertainty Relation 

      Benczik, S; Chang, LN; Minic, D; Okamura, N; Rayyan, S; Takeuchi, T
      We study the phenomenological implications of the classical limit of the "stringy" commutation relations [x_i,p_j]=i hbar[(1+beta p^2) delta_{ij} + beta' p_i p_j]. In particular, we investigate the "deformation" of Kepler's ...
    • 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 ...
    • 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 ...
    • Constraints on two-Higgs-doublet models at large tan beta from W and Z decays 

      Lebedev, O.; Loinaz, W.; Takeuchi, T. (American Physical Society, 2000-09-01)
      We study constraints on type-II two-Higgs-doublet models at large tan beta from CERN LEP and SLD Z-pole data and from lepton universality violation in W decay. We perform a global fit and find that, in the context of Z ...
    • 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 ...
    • Effect of the minimal length uncertainty relation on the density of states and the cosmological constant problem 

      Chang, L. N.; Minic, D.; Okamura, N.; Takeuchi, T. (American Physical Society, 2002-06-15)
      We investigate the effect of the minimal length uncertainty relation, motivated by perturbative string theory, on the density of states in momentum space. The relation is implemented through the modified commutation relation ...
    • An evaluation of the analytic continuation by duality technique 

      Takeuchi, T; Goonetileke, LC; Ignjatovic, SR; Wijewardhana, LCR
      In Nucl. Phys. B391 (1993) 127, the value of the oblique correction parameter S for walking technicolor theories was estimated using a technique called Analytic Continuation by Duality (ACD). We apply the ACD technique to ...
    • Exact solution of the harmonic oscillator in arbitrary dimensions with minimal length uncertainty relations 

      Chang, L. N.; Minic, D.; Okamura, N.; Takeuchi, T. (American Physical Society, 2002-06-15)
      We determine the energy eigenvalues and eigenfunctions of the harmonic oscillator where the coordinates and momenta are assumed to obey the modified commutation relations [(x) over cap (i),(p) over cap (j)]=i (h) over ...
    • 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 ...
    • 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 ...
    • 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 ...
    • 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 ...
    • Mass, entropy, and holography in asymptotically de Sitter spaces 

      Balasubramanian, V.; de Boer, J.; Minic, D. (American Physical Society, 2002-06-15)
      We propose a novel prescription for computing the boundary stress tensor and charges of asymptotically de Sitter (dS) spacetimes from data at early or late time infinity. If there is a holographic dual to dS spaces, defined ...
    • 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). ...