26,418 research outputs found
Analytical Study of the Julia Set of a Coupled Generalized Logistic Map
A coupled system of two generalized logistic maps is studied. In particular
influence of the coupling to the behaviour of the Julia set in two dimensional
complex space is analyzed both analytically and numerically. It is proved
analytically that the Julia set disappears from the complex plane uniformly as
a parameter interpolates from the chaotic phase to the integrable phase, if the
coupling strength satisfies a certain condition.Comment: 30pages, 22figure
Global analysis of AAC for determining polarized parton distribution functions
We report global analysis results for polarized parton distribution functions
in the nucleon. The optimum distributions are determined by using spin
asymmetry data on polarized lepton scattering on proton, neutron, and deuteron.
Their uncertainties are estimated by the Hessian method. As a result, polarized
quark distributions are relatively well determined, whereas the polarized gluon
distribution has a large uncertainty band. We find that the obtained gluon
distribution is compatible with recent \Delta g/g measurements in high-p_T
hadron productions.Comment: 3 pages, 2 figures, to be published in the proceedings of the XVIIth
Particles and Nuclei International Conference (PANIC), Santa Fe, New Mexico,
USA, October 24-28, 200
Broken axisymmetry phase of a spin-1 ferromagnetic Bose-Einstein condensate
A spin-1 ferromagnetic Bose-Einstein condensate subject to a certain magnetic
field exhibits a broken-axisymmetry phase in which the magnetization tilts
against the applied magnetic field due to the competition between
ferromagnetism and linear and quadratic Zeeman effects. The Bogoliubov analysis
shows that in this phase two Goldstone modes associated with U(1) and SO(2)
symmetry breakings exist, in which phonons and magnons are coupled to restore
the two broken symmetries.Comment: 11 pages, 6 figure
Physics Beyond SM at RHIC with Polarized Protons
The capabilities of RHIC with polarized protons to test the Lorentz structure
of electroweak interactions and also the properties of MSSM Higgs, should it be
discovered, are discussed.Comment: Report to the 14th International Symposium on Spin Physics, October
16-21, 2000, RCNP, Osaka University, Osaka, Japan. To be published in the
Proceedings, 6 page
A Finite Size Scaling Study of Lattice Models in the three-dimensional Ising Universality Class
We simulate the spin-1/2 Ising model and the Blume-Capel model at various
values of the parameter D on the simple cubic lattice. We perform a finite size
scaling study of lattices of a linear size up to L=360 to obtain accurate
estimates for critical exponents. We focus on values of D, where the amplitudes
of leading corrections are small. Furthermore we employ improved observables
that have a small amplitude of the leading correction. We obtain
nu=0.63002(10), eta=0.03627(10) and omega=0.832(6). We compare our results with
those obtained from previous Monte Carlo simulations and high temperature
series expansions of lattice models, by using field theoretic methods and
experiments.Comment: 25 pages, 6 figures, typos corrected, references added, conclusions
extende
Lattice supersymmetry in 1D with two supercharges
A consistent formulation of a fully supersymmetric theory on the lattice has
been a long standing challenge. In recent years there has been a renewed
interest on this problem with different approaches. At the basis of the
formulation we present in the following there is the Dirac-Kahler twisting
procedure, which was proposed in the continuum for a number of theories,
including N=4 SUSY in four dimensions. Following the formalism developed in
recent papers, an exact supersymmetric theory with two supercharges on a one
dimensional lattice is realized using a matrix-based model. The matrix
structure is obtained from the shift and clock matrices used in two dimensional
non-commutative field theories. The matrix structure reproduces on a one
dimensional lattice the expected modified Leibniz rule. Recent claims of
inconsistency of the formalism are discussed and shown not to be relevant.Comment: 14 pages, Presented by SA and AD at the XXV International Symposium
on Lattice Field Theory, July 30 - August 4 2007, Regensburg, German
Trust in scientists on climate change and vaccines
On climate change and other topics, conservatives have taken positions at odds with a strong scientific consensus. Claims that this indicates a broad conservative distrust of science have been countered by assertions that while conservatives might oppose the scientific consensus on climate change or evolution, liberals oppose scientists on some other domains such as vaccines. Evidence for disproportionately liberal bias against science on vaccines has been largely anecdotal, however. Here, we test this proposition of opposite biases using 2014 survey data from Oregon and New Hampshire. Across vaccine as well as climate change questions on each of these two surveys, we find that Democrats are most likely to say they trust scientists for information, and Tea Party supporters are least likely, contradicting the proposition of opposite bias. Moreover, partisan divisions tend to widen with education. Theoretical explanations that have been offered for liberal trust or conservative distrust of science in other specific domains such as climate change or environmental protection fit less well with these results on vaccines. Given the much different content of climate change and vaccine issues, the common political pattern appears more consistent with hypotheses of broader ideological divisions on acceptance of science
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