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Cosmological constraints from the redshift dependence of the Alcock-Paczynski test: galaxy density gradient field
Xiao-Dong Li, Changbom Park, Jaime E. Forero-Romero +1
We propose a method based on the redshift dependence of the Alcock-Paczynski (AP) test to measure the expansion history of the Universe. It uses the isotropy of the galaxy density…
Primordial non-Gaussian signatures in CMB polarization
Vidhya Ganesan, Pravabati Chingangbam, K. P. Yogendran +1
We study the signatures of local type primordial non-Gaussianity, parametrized by $\fnl$, of scalar perturbations in CMB polarization using the probability distribution functions,…
Dark matter halos of barred disk galaxies
Bernardo Cervantes Sodi, Cheng Li, Changbom Park
We use a large volume-limited sample of disk galaxies drawn from the Sloan Digital Sky Survey Data Release 7 to study the dependence of the bar fraction on the stellar-to-halo mass…
Exact Third-Order Density Perturbation and One-Loop Power Spectrum in General Dark Energy Models
Seokcheon Lee, Changbom Park, Sang Gyu Biern
Under the standard perturbation theory (SPT), we obtain the fully consistent third-order density fluctuation and kernels for the general dark energy models without using the Einste…
EUNHA: a new cosmological hydro simulation code
Jihye Shin, Juhan Kim, Sungsoo S. Kim +1
We have developed a parallel cosmological hydrodynamic simulation code designed for the study of formation and evolution of cosmological structures. The gravitational force is calc…
Effects of the initial conditions on cosmological -body simulations
Benjamin L'Huillier, Changbom Park, Juhan Kim
Cosmology is entering an era of percent level precision due to current large observational surveys. This precision in observation is now demanding more accuracy from numerical meth…