Browsing Institute for Particle, Nuclear and Astronomical Sciences (IPNAS) by Title
Now showing items 120 of 33

14year program monitoring the flux densities of 33 radio sources at low frequencies
(IOP PUBLISHING LTD, 199901)We present the results of a lowfrequency 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
(IOP PUBLISHING LTD, 199812)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 ... 
alphastates in de Sitter space
(American Physical Society, 200502)Field theory in de Sitter space admits a oneparameter 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
(American Physical Society, 20030915)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 multipleU(1) gauge theories
(American Physical Soc, 19991201) 
Charge assignments in multipleU(1) gauge theories
(American Physical Society, 19991201)We discuss the choice of gauge field basis in multipleU(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 oneloop ... 
Classical Implications of the Minimal Length Uncertainty Relation
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 Rparity violating couplings from CERN LEP and SLAG SLD hadronic observables
(American Physical Society, 20000701)We analyze the one loop corrections to hadronic Z decays in an Rparity 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 Rparity violating couplings from lepton universality
(American Physical Society, 20000701)We analyze the one loop corrections to leptonic W and Z decays in an Rparity violating extension to the minimal supersymmetric standard model. We find that lepton universality violation in the Z lineshape variables alone ... 
Constraints on twoHiggsdoublet models at large tan beta from W and Z decays
(American Physical Society, 20000901)We study constraints on typeII twoHiggsdoublet models at large tan beta from CERN LEP and SLD Zpole 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
(IOP PUBLISHING LTD, 199701)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
(American Physical Society, 20020615)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
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
(American Physical Society, 20020615)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
(IOP PUBLISHING LTD, 200211)We study Galactic emission foreground contamination of the Owens Valley Radio Observatory and UCSB South Pole 1994 cosmic microwave background anisotropy data by crosscorrelating with templates of infrared dust emission ... 
Glueball spectrum of pure YangMills theory in 2+1 dimensions
(American Physical Society, 200709)We present details of the analytic computation of the spectrum of lowest spin glueballs in pure YangMills theory in 2+1 dimensions. The new ingredient is provided by the conjectured new nontrivial expression for the ... 
Hydrogenatom spectrum under a minimallength hypothesis
(American Physical Society, 200507)The energy spectrum of the Coulomb potential with minimal length commutation relations [Xi, Pj] = ih{delta ij(1 + beta P2) + 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)
(American Physical Society, 200603)We consider a search for the CPviolating 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
(American Physical Society, 20020615)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 twodimensional continuum phi(4) theory
(American Physical Society, 199810)We perform a Monte Carlo simulation calculation of the critical coupling constant for the continuum twodimensional (lambda/4) phi(4) theory. The critical coupling constant we obtain is [lambda/mu(2)](crit) = 10.26(.04)(+.08). ...