782 citations · 8.5k across the 161 of their papers we have counts for
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Exploring CP Violation beyond the Standard Model and the PQ Quality with Electric Dipole Moments
Kiwoon Choi, Sang Hui Im, Krzysztof Jodłowski
In some models of physics beyond the Standard Model (SM), one of the leading low energy consequences of the model appears in the form of the chromo-electric dipole moments (CEDMs)…
Axion dark matter with thermal friction
Kiwoon Choi, Sang Hui Im, Hee Jung Kim +1
Cosmological evolution of axion field in the early universe might be significantly affected by a thermal friction induced by the axion coupling to thermalized hidden sector. We exa…
Axion emission from supernova with axion-pion-nucleon contact interaction
Kiwoon Choi, Hee Jung Kim, Hyeonseok Seong +1
We examine the axion emission from supernovae with a complete set of relevant axion couplings including the axion-pion-nucleon contact interaction which was ignored in the previous…
Precision axion physics with running axion couplings
Kiwoon Choi, Sang Hui Im, Hee Jung Kim +1
We study the renormalization group running of axion couplings while taking into account that the Standard Model can be extended to its supersymmetric extension at a certain energy…
Dispersion of neutrinos in a medium
Ki-Young Choi, Eung Jin Chun, Jongkuk Kim
We analyze the dispersion relations of Weyl or Majorana, and Dirac neutrinos in a complex scalar medium which interacts with the neutrinos through Yukawa couplings. They are solved…
Recent Progress in the Physics of Axions and Axion-Like Particles
Kiwoon Choi, Sang Hui Im, Chang Sub Shin
The axion is a light pseudoscalar particle postulated to solve issues with the Standard Model, including the strong CP problem and the origin of dark matter. In recent years, there…
Searching for Boosted Dark Matter mediated by a new Gauge Boson
Wonsub Cho, Ki-Young Choi, Seong Moon Yoo
We study the possibility to directly detect the boosted dark matter generated from the scatterings with high energetic cosmic particles such as protons and electrons. As a concrete…
Axion-photon-dark photon oscillation and its implication for 21 cm observation
Kiwoon Choi, Hyeonseok Seong, Seokhoon Yun
We examine the resonant conversion of axion-like particle (ALP) or dark photon to the electromagnetic photon in the early Universe, which takes place due to the ALP-photon-dark pho…
Neutrino Oscillations in Dark Matter
Ki-Young Choi, Eung Jin Chun, Jongkuk Kim
We study neutrino oscillations in a medium of dark matter which generalizes the standard matter effect. A general formula is derived to describe the effect of various mediums and t…
Axion scales and couplings with Stückelberg mixing
Kiwoon Choi, Chang Sub Shin, Seokhoon Yun
We study the axion field range and low energy couplings in models with Stückelberg mixing between axions and gauge bosons. It is noted that the gauge-invariant axion combina…
Light Higgs bosons in the general NMSSM
Kiwoon Choi, Sang Hui Im, Kwang Sik Jeong +1
Physics beyond the Standard Model (SM) may manifest itself as small deviations from the SM predictions for Higgs signal strengths at 125 GeV. Then, a plausible and interesting poss…
Searching for Axino-Like Particle at Fixed Target Experiments
Ki-Young Choi, Takeo Inami, Kenji Kadota +2
We investigate the detectability of axino-like particle, which is defined as a supersymmetric partner of axion-like particle and can be a good candidate for dark matter in our Univ…
Thermal production of light Dirac right-handed sneutrino dark matter
Ki-Young Choi, Jongkuk Kim, Osamu Seto
We consider the production of right-handed (RH) sneutrino dark matter in a model of Dirac neutrino where neutrino Yukawa coupling constants are very small. Dark matter RH sneutrino…
Axino abundances in high-scale supersymmetry
Ki-Young Choi, Hyun Min Lee
We consider the thermal production of axino dark matter in high-scale supersymmetry where all the superpartners except the axino are heavier than the maximum and reheating temperat…
Gamma-ray spectral modulations induced by photon-ALP-dark photon oscillations
Kiwoon Choi, Sangjun Lee, Hyeonseok Seong +1
Recently it has been noticed that the Fermi-LAT data of gamma-rays from some galactic pulsars and supernova remnants reveal spectral modulations that might be explained by the conv…
Non-thermal WIMP baryogenesis
Ki-Young Choi, Sin Kyu Kang, Jongkuk Kim
We propose a WIMP baryogensis achieved by the annihilation of non-thermally produced WIMPs from decay of heavy particles, which can result in low reheating temerature. Dark matter…
Late-time magnetogenesis driven by ALP dark matter and dark photon
Kiwoon Choi, Hyungjin Kim, Toyokazu Sekiguchi
We propose a mechanism generating primordial magnetic fields after the annihilations. Our mechanism involves an ultra-light axion-like particle (ALP) which constitutes the…
General Continuum Clockwork
Kiwoon Choi, Sang Hui Im, Chang Sub Shin
The continuum clockwork is an extra-dimensional set-up to realize certain features of the clockwork mechanism generating exponentially suppressed or hierarchical couplings of light…
Minimal Flavor Violation with Axion-like Particles
Kiwoon Choi, Sang Hui Im, Chan Beom Park +1
We revisit the flavor-changing processes involving an axion-like particle (ALP) in the context of generic ALP effective lagrangian with a discussion of possible UV completions prov…
Constraining dark photon model with dark matter from CMB spectral distortions
Ki-Young Choi, Kenji Kadota, Inwoo Park
Many extensions of Standard Model (SM) include a dark sector which can interact with the SM sector via a light mediator. We explore the possibilities to probe such a dark sector by…
Dynamics of the cosmological relaxation after reheating
Kiwoon Choi, Hyungjin Kim, Toyokazu Sekiguchi
We examine if the cosmological relaxation mechanism, which was proposed recently as a new solution to the hierarchy problem, can be compatible with high reheating temperature well…
Constraints on Relaxion Windows
Kiwoon Choi, Sang Hui Im
We examine the low energy phenomenology of the relaxion solution to the weak scale hierarchy problem. Assuming that the Hubble friction is responsible for a dissipation of the rela…
750 GeV diphoton resonance and electric dipole moments
Kiwoon Choi, Sang Hui Im, Hyungjin Kim +1
We examine the implication of the recently observed 750 GeV diphoton excess for the electric dipole moments of the neutron and electron. If the excess is due to a spin zero resonan…
Realizing the relaxion from multiple axions and its UV completion with high scale supersymmetry
Kiwoon Choi, Sang Hui Im
We discuss a scheme to implement the relaxion solution to the hierarchy problem with multiple axions, and present a UV-completed model realizing the scheme. All of the axions i…