181 citations · 772 across the 28 of their papers we have counts for
29 papers
Probing inflationary moduli space with gravitational waves
Shinsuke Kawai, Jinsu Kim
We investigate the spectrum of gravitational waves arising from primordial inflation in the presence of a string-theoretical higher curvature correction, specifically, the Gauss-Bo…
Nonminimally Assisted Inflation: A General Analysis
Sang Chul Hyun, Jinsu Kim, Tatsuki Kodama +2
The effects of a scalar field, known as the "assistant field," which nonminimally couples to gravity, on single-field inflationary models are studied. The analysis provides analyti…
Search for the Sagittarius Tidal Stream of Axion Dark Matter around 4.55 eV
Andrew K. Yi, Saebyeok Ahn, Çağlar Kutlu +29
We report the first search for the Sagittarius tidal stream of axion dark matter around 4.55 eV using CAPP-12TB haloscope data acquired in March of 2022. Our result excluded the…
Primordial black holes and gravitational waves from nonminimally coupled supergravity inflation
Shinsuke Kawai, Jinsu Kim
We study the formation of primordial black holes and the generation of gravitational waves in a class of cosmological models that are direct supersymmetric analogs of the observati…
Near-Quantum-Noise Axion Dark Matter Search at CAPP around 9.5 eV
Jinsu Kim, Ohjoon Kwon, Çağlar Kutlu +9
We report the results of an axion dark matter search over an axion mass range of 9.39-9.51 eV. A flux-driven Josephson parametric amplifier (JPA) was added to the cryogenic rece…
Non-minimally assisted chaotic inflation
Sang Chul Hyun, Jinsu Kim, Seong Chan Park +1
Conventional wisdom says that a chaotic inflation model with a power-law potential is ruled out by the recent Planck-BICEP/Keck results. We find, however, that the model can be ass…
A Two-Component Dark Matter Model and its Associated Gravitational Waves
Francesco Costa, Sarif Khan, Jinsu Kim
We consider an extension of the Standard Model that accounts for the muon tension and neutrino masses and study in detail dark matter phenomenology. The model under considera…
General Analytical Conditions for Inflaton Fragmentation: Quick and Easy Tests for its Occurrence
Jinsu Kim, John McDonald
Understanding the physics of inflaton condensate fragmentation in the early Universe is crucial as the existence of fragments in the form of non-topological solitons (oscillons or…
Primordial blackholes from Gauss-Bonnet-corrected single field inflation
Shinsuke Kawai, Jinsu Kim
Primordial blackholes formed in the early Universe via gravitational collapse of over-dense regions may contribute a significant amount to the present dark matter relic density. In…
CMB from a Gauss-Bonnet-induced de Sitter fixed point
Shinsuke Kawai, Jinsu Kim
In the gravitational effective theories including higher curvature terms, cosmological solutions can have nontrivial de Sitter fixed points. We study phenomenological implications…
A multi-component SIMP model with
Soo-Min Choi, Jinsu Kim, Pyungwon Ko +1
Multi-component dark matter scenarios are studied in the model with dark gauge symmetry that is broken into its product subgroup á la Krauss-Wilczek mecha…
Characterization of a flux-driven Josephson parametric amplifier with near quantum-limited added noise for axion search experiments
Çağlar Kutlu, Arjan F. van Loo, Sergey V. Uchaikin +7
The axion, a hypothetical elementary pseudoscalar, is expected to solve the strong CP problem of QCD and is also a promising candidate for dark matter. The most sensitive axion sea…
First Results from Axion Haloscope at CAPP around 10.7 eV
Ohjoon Kwon, Doyu Lee, Woohyun Chung +20
The Center for Axion and Precision Physics research at the Institute for Basic Science is searching for axion dark matter using ultra-low temperature microwave resonators. We repor…
Connecting between inflation and dark matter in models with gauged symmetry
Soo-Min Choi, Jinsu Kim, Hyun Min Lee +1
We investigate the possibility of unifying the inflation and dark matter physics in the minimal model for a complex scalar dark matter with gauged symmetry. The dark local $U…
Exploiting higher-order resonant modes for axion haloscopes
Jinsu Kim, SungWoo Youn, Junu Jeong +3
The haloscope is one of the most sensitive approaches to the QCD axion physics within the region where the axion is considered to be a dark matter candidate. Current experimental s…
Axion Dark Matter Research with IBS/CAPP
Yannis K. Semertzidis, Jihn E. Kim, SungWoo Youn +34
The axion, a consequence of the PQ mechanism, has been considered as the most elegant solution to the strong-CP problem and a compelling candidate for cold dark matter. The Center…
Comment on "Tunable Supermode Dielectric Resonators for Axion Dark-Matter Haloscopes"
Jinsu Kim, SungWoo Youn, Junu Jeong +1
We comment on a recently published paper, Phys. Rev. Applied 9, 014028 (2018), which presents frequency-tuning mechanisms for dielectric resonators and demonstrates their potential…
Searching for Flavored Gauge Bosons
Eung Jin Chun, Arindam Das, Jinsu Kim +1
Standard Model may allow an extended gauge sector with anomaly-free flavored gauge symmetries, such as , , and , where are fla…
Effective Approximation of Electromagnetism for Axion Haloscope Searches
Younggeun Kim, Dongok Kim, Junu Jung +3
We applied an effective approximation into Maxwell's equations with an axion interaction for haloscope searches. A set of Maxwell's equations acquired from this approximation descr…
Freeze-In Dark Matter from a sub-Higgs Mass Clockwork Sector via the Higgs Portal
Jinsu Kim, John McDonald
The clockwork mechanism allows extremely weak interactions and small mass scales to be understood in terms of the structure of a theory. A natural application of the clockwork mech…
Clockwork Higgs portal model for freeze-in dark matter
Jinsu Kim, John McDonald
The clockwork mechanism can explain interactions which are dimensionally very weak without the need for very large mass scales. We present a model in which the clockwork mechanism…
Gauss-Bonnet Chern-Simons gravitational wave leptogenesis
Shinsuke Kawai, Jinsu Kim
The gravitational Chern-Simons term coupled to an evolving axion is known to generate lepton number through the gravitational anomaly. We examine this leptogenesis scenario in the…
Inflaton condensate fragmentation: Analytical conditions and application to -attractor models
Jinsu Kim, John McDonald
We study the stability of an inflaton condensate in the presence of attractive inflaton self-interactions, in order to determine analytical conditions on the self-interaction coupl…
Chaotic initial conditions for nonminimally coupled inflation via a conformal factor with a zero
Jinsu Kim, John McDonald
Nonminimally coupled inflation models based on a nonminimal coupling and a potential are in excellent agreement with the scalar spectral index observed by Planck…