Institute for Particle, Nuclear and Astronomical Sciences (IPNAS)
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QUANTUM GRAVITY, DYNAMICAL ENERGY-MOMENTUM SPACE AND VACUUM ENERGY
(World Scientific Publ Co Pte Ltd, 2010-11-01) -
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 ... -
Precision Tests of Electroweak Physics
We review the current status of precision electroweak measurements and the constraints they impose on new physics. We perform a model independent analysis using the STU-formalism of Ref. 1, and then discuss how the Z-pole ... -
Charge assignments in multiple-U(1) gauge theories
(American Physical Soc, 1999-12-01) -
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 ... -
A Water Maser Flare in W49N: Amplification by a Rotating Foreground Cloud
(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
(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
(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 ... -
Detection in Hα of a Supershell Associated with W4
(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 ... -
The Extreme Scattering Event toward PKS 1741-038: VLBI Images
(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
(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
(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
(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 ... -
Monte Carlo simulation calculation of the critical coupling constant for two-dimensional continuum phi(4) theory
(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). ... -
Charge assignments in multiple-U(1) gauge theories
(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 ... -
Notes on spacetime thermodynamics and the observer dependence of entropy
(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 ... -
Constraints on R-parity violating couplings from CERN LEP and SLAG SLD hadronic observables
(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, lepton universality, and nonuniversal neutrino-gauge couplings
(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 ... -
NuTeV anomaly, neutrino mixing, and a heavy Higgs boson
(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
(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 ...
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