240 citations · 1k across the 31 of their papers we have counts for
31 papers
The EDM inverse problem: Identifying the sources of CP violation and PQ breaking with electric dipole moments
Kiwoon Choi, Sang Hui Im
Many extensions of the Standard Model (SM) generically introduce new sources of CP violation, which can induce observable -odd and -odd permanent electric dipole moments (EDM…
Probing the axion-electron coupling at cavity experiments
Deog Ki Hong, Sang Hui Im, Jinsu Kim +2
Axion dark matter induces electromagnetic radiation in conductors through nearly perpetual oscillations of electrons, driven by axion-electron interactions through the so-called ch…
Limits on heavy neutral leptons, bosons and majorons from high-energy supernova neutrinos
Kensuke Akita, Sang Hui Im, Mehedi Masud +1
Light hypothetical particles with masses up to can be produced in the core of supernovae. Their subsequent decays to neutrinos can produce a flux comp…
Electromagnetic field in a cavity induced by gravitational waves
Danho Ahn, Yeong-Bok Bae, Sang Hui Im +1
The detection method of gravitational waves (GW) using electromagnetic (EM) cavities has garnered significant attention in recent years. This paper thoroughly examines the analysis…
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)…
Holographic light dilaton at the conformal edge
Jesús Cruz Rojas, Deog Ki Hong, Sang Hui Im +1
We study a simple holographic model for gauge theories near the conformal edge to show that the dilaton can be parametrically lighter than any other composite states. The masses of…
Detecting axion dark matter with chiral magnetic effects
Deog Ki Hong, Sang Hui Im, Kwang Sik Jeong +1
We show that dark matter axions or axion-like particles (ALP) induce spontaneously alternating electric currents in conductors along the external magnetic fields due to the (medium…
Probing non-standard neutrino interactions with a light boson from next galactic and diffuse supernova neutrinos
Kensuke Akita, Sang Hui Im, Mehedi Masud
Non-standard neutrino interactions with a massive boson can produce the bosons in the core of core-collapse supernovae (SNe). After the emission of the bosons from the SN core, the…
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…
Electroweak baryogenesis by axionlike dark matter
Sang Hui Im, Kwang Sik Jeong, Yeseong Lee
We show that an axionlike particle (ALP) naturally implements spontaneous electroweak baryogenesis through a cosmic evolution strongly tied to the electroweak phase transition (EWP…
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…
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…
Supersymmetric Clockwork Axion Model and Axino Dark Matter
Kyu Jung Bae, Sang Hui Im
Implications of supersymmetrizing the clockwork axions are studied. Supersymmetry ensures that the saxions and axinos have the same pattern of the coupling hierarchy as the clockwo…
Freeze-in Axion-like Dark Matter
Sang Hui Im, Kwang Sik Jeong
We present an interesting Higgs portal model where an axion-like particle (ALP) couples to the Standard Model sector only via the Higgs field. The ALP becomes stable due to CP inva…
Axion clockworks from heterotic M-theory: the QCD-axion and its ultra-light companion
Sang Hui Im, Hans Peter Nilles, Marek Olechowski
A previously discussed clockwork mechanism within heterotic M-theory is applied to its axion landscape. We identify a unique candidate for a QCD-axion with a decay constant in the…
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…
Heterotic M-Theory from the Clockwork Perspective
Sang Hui Im, Hans Peter Nilles, Marek Olechowski
Compactifications of heterotic M-theory are shown to provide solutions to the weak- and axion-scale hierarchy problems as a consequence of warped large extra dimensions. They allow…
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…
Exploring extra dimensions through inflationary tensor modes
Sang Hui Im, Hans Peter Nilles, Andreas Trautner
Predictions of inflationary schemes can be influenced by the presence of extra dimensions. This could be of particular relevance for the spectrum of gravitational waves in models w…
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…
Diluting the inflationary axion fluctuation by a stronger QCD in the early Universe
Kiwoon Choi, Eung Jin Chun, Sang Hui Im +1
We propose a new mechanism to suppress the axion isocurvature perturbation, while producing the right amount of axion dark matter, within the framework of supersymmetric axion mode…