121 citations · 1.8k across the 142 of their papers we have counts for
6 papers · 1 filter
Four-quark structure of the excited states of heavy mesons
Hungchong Kim, Myung-Ki Cheoun, Yongseok Oh
We propose a four-quark structure for some of the excited states of heavy mesons containing a single charm or bottom quark. The four-quark wave functions are constructed based on a…
Cosmological solutions to the Lithium problem: Big-bang nucleosynthesis with photon cooling, -particle decay and a primordial magnetic field
Dai G. Yamazaki, Motohiko Kusakabe, Toshitaka Kajino +2
The Li abundance calculated in BBN with the baryon-to-photon ratio fixed from fits to the CMB power spectrum is inconsistent with the observed lithium abundances on the surface…
Asymmetric Neutrino Production in Strongly Magnetized Proto-Neutron Stars
Tomoyuki Maruyama, Myung-Ki Cheoun, Jun Hidaka +6
We calculate the neutrino production cross-section through the direct URCA process in proto-neutron star matter in the presence of a strong magnetic field. We assume isoentropic co…
General limit on the relation between abundances of D and Li in big bang nucleosynthesis with nucleon injections
Motohiko Kusakabe, Myung-Ki Cheoun, K. S. Kim
The injections of energetic hadrons could have occurred in the early universe by decays of hypothetical long-lived exotic particles. The injections induce the showers of nonthermal…
Equation of state for neutron stars: Hyperon mixing in SU(3) flavor symmetry
Tsuyoshi Miyatsu, Myung-Ki Cheoun, Koichi Saito
Using various kinds of relativistic mean-field models as well as the quark-meson coupling model, we study in detail the properties of neutron stars. We find that the equation of st…
Revised Big Bang Nucleosynthesis with long-lived negatively charged massive particles: updated recombination rates, primordial 9Be nucleosynthesis, and impact of new 6Li limits
Motohiko Kusakabe, K. S. Kim, Myung-Ki Cheoun +3
We extensively reanalyze effects of a long-lived negatively charged massive particle, X-, on big bang nucleosynthesis (BBN). The BBN model with an X- particle was originally motiva…