268 citations · 2.8k across the 100 of their papers we have counts for
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CMASS galaxy sample and the ontological status of the cosmological principle
Yigon Kim, Chan-Gyung Park, Hyerim Noh +1
The cosmological principle (CP), assuming spatially homogeneous and isotropic background geometry in the cosmological scale, is a fundamental assumption in modern cosmology. Recent…
Oscillating gravitational potential due to ultralight axion: linear theory
Jai-chan Hwang, Hyerim Noh
We derive oscillating gravitational potential caused by an ultralight axion as the cosmic dark matter, assuming the Compton wavelength smaller than the horizon scale. A new oscilla…
Axion as a fuzzy-dark-matter candidate: Proofs in different gauges
Jai-chan Hwang, Hyerim Noh
Axion as a coherently oscillating massive scalar field is known to behave as a zero-pressure irrotational fluid with characteristic quantum stress on a small scale. In relativistic…
Gauge-Invariant Tensor Perturbations Induced from Baryon-CDM Relative Velocity and the B-mode Polarization of the CMB
James Gurian, Donghui Jeong, Jai-chan Hwang +1
At second-order, scalar perturbations can source traceless and transverse perturbations to the metric, called induced gravitational waves (IGW). The apparent gauge-dependence of th…