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pro vyhledávání: '"Park, Chan Gyung"'
We study the performance of the spatially-flat dynamical dark energy (DE) $w_0w_a$CDM parameterization, with redshift-dependent DE fluid equation of state parameter $w(z) = w_0 + w_a z/(1+z)$, with and without a varying CMB lensing consistency parame
Externí odkaz:
http://arxiv.org/abs/2410.13627
We use a combination of Planck cosmic microwave background (CMB) anisotropy data and non-CMB data that include Pantheon+ type Ia supernovae (SNIa), Hubble parameter [$H(z)$], growth factor ($f\sigma_8$) measurements, and a collection of baryon acoust
Externí odkaz:
http://arxiv.org/abs/2405.00502
We study 6 LCDM models, with 4 allowing for non-flat geometry and 3 allowing for a non-unity lensing consistency parameter $A_L$. We also study 6 XCDM models with a dynamical dark energy density X-fluid with equation of state $w$. For the non-flat mo
Externí odkaz:
http://arxiv.org/abs/2404.19194
We study the performance of three pairs of tilted $\Lambda$CDM cosmological models, two pairs allowing for non-flat spatial hypersurfaces with CMB temperature and polarization power spectrum data (P18) from Planck, P18 lensing (lensing), and non-CMB
Externí odkaz:
http://arxiv.org/abs/2211.04268
Publikováno v:
A&A 660, A139 (2022)
The cosmological principle (CP), assuming spatially homogeneous and isotropic background geometry in the cosmological scale, is a fundamental assumption in modern cosmology. Recent observations of the galaxy redshift survey provide relevant data to c
Externí odkaz:
http://arxiv.org/abs/2112.04134
As a physical and sufficient compression of the full CMB data, the CMB distance priors, or shift parameters, have been widely used and provide a convenient way to include CMB data when obtaining cosmological constraints. In this paper, we revisit thi
Externí odkaz:
http://arxiv.org/abs/1912.04921
Autor:
Park, Chan-Gyung, Ratra, Bharat
Publikováno v:
Phys. Rev. D 101, 083508 (2020)
We use six tilted spatially-flat and untilted non-flat dark energy cosmological models in analyses of South Pole Telescope polarization (SPTpol) cosmic microwave background (CMB) data, alone and in combination with Planck 2015 CMB data and non-CMB da
Externí odkaz:
http://arxiv.org/abs/1908.08477
We examine the effects of dark energy dynamics and spatial curvature on cosmic reionization by studying reionization in tilted spatially-flat and untilted non-flat XCDM and $\phi$CDM dynamical dark energy inflation models that best fit the Planck 201
Externí odkaz:
http://arxiv.org/abs/1901.09927
Akademický článek
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Autor:
Park, Chan-Gyung, Ratra, Bharat
Cosmic microwave background (CMB) anisotropy (spatial inhomogeneity) data provide the tightest constraints on the Hubble constant, matter density, spatial curvature, and dark energy dynamics. Other data, sensitive to the evolution of only the spatial
Externí odkaz:
http://arxiv.org/abs/1809.03598