268 citations · 2.8k across the 100 of their papers we have counts for
8 papers · 1 filter
Non-singular big-bounces and evolution of linear fluctuations
J. Hwang, H. Noh
We consider evolutions of linear fluctuations as the background Friedmann world model goes from contracting to expanding phases through smooth and non-singular bouncing phases. As…
Quintessential perturbations during scaling regime
J. Hwang, H. Noh
The scalar field with an exponential potential allows a scaling solution where the the density of the field follows the density of the dominating fluid. Such a scaling regime is of…
On the 1/3 factor in the CMB Sachs-Wolfe effect
J. Hwang, T. Padmanabhan, O. Lahav +1
We point out that a pseudo-Newtonian interpretations of the factor in the Sachs-Wolfe effect, which relates the fluctuations in temperature and potential, $(δT/ T) = (1/ 3)…
Inflationary spectra in generalized gravity: Unified forms
H. Noh, J. Hwang
The classical evolution and the quantum generation processes of the scalar- and tensor-type cosmological perturbations in the context of a broad class of generalized gravity theori…
Cosmological Perturbations with Multiple Fluids and Fields
J. Hwang, H. Noh
We consider the evolution of perturbed cosmological spacetime with multiple fluids and fields in Einstein gravity. Equations are presented in gauge-ready forms, and are presented i…
f(R) gravity theory and CMBR constraints
J. Hwang, H. Noh
We consider the large-scale cosmic structure generation by an inflation based on a pure f(R)-type gravity theory. Comparison with recent CMBR observations gives the following resul…