33,372 research outputs found
Simulation of Cosmic Microwave Background Polarization Fields for AMiBA Experiment
We have made a topological study of cosmic microwave background (CMB)
polarization maps by simulating the AMiBA experiment results. A CDM
CMB sky is adopted to make mock interferometric observations designed for the
AMiBA experiment. CMB polarization fields are reconstructed from the AMiBA mock
visibility data using the maximum entropy method. We have also considered
effects of Galactic foregrounds on the CMB polarization fields. The genus
statistic is calculated from the simulated and polarization maps, where
and are Stokes parameters. Our study shows that the Galactic foreground
emission, even at low Galactic latitude, is expected to have small effects on
the CMB polarization field. Increasing survey area and integration time is
essential to detect non-Gaussian signals of cosmological origin through genus
measurement.Comment: 7 pages, 4 figures, Accepted version for publication in the Journal
of the Korean Astronomical Societ
A class of inflation models with non-minimal coupling
We show that the potential of the scalar field in the Einstein frame is flat
if the nonminimal coupling term is properly chosen that it satisfies the
condition (V(phi)/K^2(phi)-> constant) as phi gets large. The cosmological
implication of this theory is studied.Comment: Talk at the international Workshop on e-Science for Physics 2008
during September 8-9, 2008 at Daejeon Convention Center, Daejeon, Kore
Monte Carlo simulations of bosonic reaction-diffusion systems and comparison to Langevin equation description
Using the Monte Carlo simulation method for bosonic reaction-diffusion
systems introduced recently [S.-C. Park, Phys. Rev. E {\bf 72}, 036111 (2005)],
one dimensional bosonic models are studied and compared to the corresponding
Langevin equations derived from the coherent state path integral formalism. For
the single species annihilation model, the exact asymptotic form of the
correlation functions is conjectured and the full equivalence of the (discrete
variable) master equation and the (continuous variable) Langevin equation is
confirmed numerically. We also investigate the cyclically coupled model of
bosons which is related to the pair contact process with diffusion (PCPD). From
the path integral formalism, Langevin equations which are expected to describe
the critical behavior of the PCPD are derived and compared to the Monte Carlo
simulations of the discrete model.Comment: Proceedings of the 3rd International Conference NEXT-SigmaPh
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