243 citations · 3k across the 96 of their papers we have counts for
4 papers · 1 filter
Axion cosmology with post-Newtonian corrections
Jai-chan Hwang, Hyerim Noh
We present first-order post-Newtonian (1PN) approximations of a general imperfect fluid and of an axion as a coherently oscillating massive scalar field, both in the cosmological c…
Cosmological perturbations in a generalized gravity including tachyonic condensation
J. Hwang, H. Noh
We present unified ways of handling the cosmological perturbations in a class of gravity theory covered by a general action in eq. (1). This gravity includes our previous generaliz…
Identification of perturbation modes and controversies in ekpyrotic perturbations
J. Hwang, H. Noh
If the linear perturbation theory is valid through the bounce, the surviving fluctuations from the ekpyrotic scenario (cyclic one as well) should have very blue spectra with suppre…
Cosmological Structure Problem of the Pre-Big Bang Scenario
J. Hwang
We calculate the density and gravitational wave spectrums generated in a version of string cosmology termed pre-big bang scenario. The large scale structures are originated from qu…