Donghui Jeong

Galaxy-CMB and galaxy-galaxy lensing on large scales: sensitivity to primordial non-Gaussianity (2009)

Jeong, Donghui, Komatsu, Eiichiro, Jain, Bhuvnesh

A convincing detection of primordial non-Gaussianity in the local form of the bispectrum, whose amplitude is given by the fNL parameter, offers a powerful test of inflation. In this paper we...

Primordial non-Gaussianity, scale-dependent bias, and the bispectrum of galaxies (2009)

Jeong, Donghui, Komatsu, Eiichiro

We calculate the bispectrum, B_g(k_1,k_2,k_3), Fourier transform of the three-point function of density peaks (e.g., galaxies), using two different methods: the Matarrese-Lucchin-Bonometto formula...

Infrared divergence of pure Einstein gravity contributions to cosmological density power spectrum (2009)

Noh, Hyerim, Jeong, Donghui, Hwang, Jai-chan

Cosmological density power spectrum has been hitherto studied mainly based on Newton's gravity theory. Earlier studies showed that, in the temporal comoving gauge and for the zero-pressure case, the...

Evolution of the curvature perturbation during and after multi-field inflation. (2009)

Choi, Ki-Young, Gong, Jinn-Ouk, Jeong, Donghui

We study the evolution of the curvature perturbation on the super-horizon scales starting from the inflationary epoch until there remains only a single dynamical degree of freedom, presureless...

Evolution of the curvature perturbation during and after multi-field inflation (2008)

Choi, Ki-Young, Gong, Jinn-Ouk, Jeong, Donghui

We study the evolution of the curvature perturbation on the super-horizon scales starting from the inflationary epoch until there remains only a single dynamical degree of freedom, presureless...

Extracting Angular Diameter Distance and Expansion Rate of the Universe from Two-dimensional Galaxy Power Spectrum at High Redshifts: Baryon Acoustic Oscillation Fitting versus Full Modeling (2008)

Shoji, Masatoshi, Jeong, Donghui, Komatsu, Eiichiro

We present a method for extracting the angular diameter distances, $D_A$, and the expansion rates, $H$, of the universe from the {\it two-dimensional} Baryon Acoustic Oscillations (BAO) in the galaxy...

Perturbation Theory Reloaded II: Non-linear Bias, Baryon Acoustic Oscillations and Millennium Simulation In Real Space (2008)

Jeong, Donghui, Komatsu, Eiichiro

We calculate the non-linear galaxy power spectrum in real space, including non-linear distortion of the Baryon Acoustic Oscillations, using the standard 3rd-order perturbation theory (PT). The...

Perturbation Theory Reloaded: Analytical Calculation of Non-linearity in Baryonic Oscillations in the Real Space Matter Power Spectrum (2006)

Jeong, Donghui, Komatsu, Eiichiro

We compare the non-linear matter power spectrum in real space calculated analytically from 3rd-order perturbation theory with N-body simulations at 1

Modular Cosmology, Thermal Inflation, Baryogenesis and Predictions for Particle Accelerators (2004)

Jeong, Donghui, Kadota, Kenji, Park, Wan-Il, Stewart, Ewan D.

Modular cosmology is plagued by overproduction of unwanted relics, gravitinos and especially moduli, at relatively low energy scales. Thermal inflation provides a compelling solution to this moduli...