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130 GeV Fermi gamma-ray line from dark matter decay
Kyae, B.,Park, J.C. North-Holland Pub. Co 2013 Physics letters: B Vol.718 No.4
The 130 GeV gamma-ray line based on tentative analyses on the Fermi-LAT data is hard to be understood with dark matter annihilation in the conventional framework of the MSSM. We point out that it can be nicely explained with two body decay of a scalar dark matter (φ@?<SUB>DM</SUB>→γγ) by the dimension 6 operator suppressed with the mass of the grand unification scale (~10<SUP>16</SUP>GeV), L@?|φ@?<SUB>DM</SUB>|<SUP>2</SUP>F<SUB>μν</SUB>F<SUP>μν</SUP>/M<SUB>GUT</SUB><SUP>2</SUP>, in which the scalar dark matter φ@?<SUB>DM</SUB> develops a TeV scale vacuum expectation value. We propose a viable model explaining the 130 GeV gamma-ray line.
Light dark matter for Fermi-LAT and CDMS observations
Kyae, B.,Park, J.C. North-Holland Pub. Co 2014 Physics letters. Section B Vol.732 No.-
Light fermionic/scalar dark matter (DM) (m<SUB>DM</SUB>~8 GeV) neutral under the standard model can be responsible for the CDMS and CoGeNT signals, and the Fermi-LAT gamma-ray excesses. In order to explain them in a relatively simple framework, we have explored various DM annihilation and scattering processes, discussing important phenomenological constraints coming from particle physics. Assuming that the two independent observations have a common DM origin and the processes arise through a common mediator, DM should annihilate into tau/anti-tau lepton pairs through an s-channel, and scatter with nuclei through a t-channel process. To avoid the p-wave suppression, a new Higgs-like scalar field with a mass of O(1) TeV is necessary as a common mediator of both the processes. We propose a supersymmetric model realizing the scenario.
Given-before-New and Theory of Mind in English-Acquiring Children
Kyae-Sung Park(박계성) 담화·인지언어학회 2021 담화와 인지 Vol.28 No.1
This study investigates whether the Given-before-New principle develops in tandem with Theory of Mind (ToM) in native-English-acquiring children. In native adult speech, given information tends to precede new information. Some research suggests that young children do not show adult-like use of the Given-before-New principle because of not having mastered ToM. The present study experimentally tests the relation between the two, in addition to adherence to the Given-before-New principle in English-acquiring children, focusing on the English dative alternation. The results indicate that children show an apparent syntactic bias toward the prepositional dative and a strong dispreference for the New–Given double object dative, which overrides the Given-before-New principle. Analysis of individual consistency shows that some children who have knowledge of ToM adhere to the Given-before-New principle, but children who lack knowledge of ToM do not. Thus, this study suggests that the Given-before-New principle emerges after the development of ToM in native-English-speaking children.
Pecci-Quinn Extension of the Natural Hybrid Inflation Model
Bumseok Kyae 한국물리학회 2012 새물리 Vol.62 No.7
The "natural hybrid inflation model," which combines the supersymmetric hybrid model and the natural inflation model, was proposed to achieve the spectral index of 0.96, and an axion decay constant of intermediate scale. By introducing both the U(1)_R and a shift symmetry and employing the minimal Kahler potential, we were able to avoid the eta-problem. The two inflaton fields in this model can admit a large non-Gaussianity. For a full realization of the idea of the natural inflation, the shift symmetry in the model should be embedded in a U(1)_(PQ) symmetry.
Decaying LSP in SO(10) GUT and PAMELA's cosmic positron
North-Holland Pub. Co 2010 Physics letters: B Vol.685 No.1
We suppose that the lightest supersymmetric particle (LSP) in the minimal supersymmetric standard model (MSSM) is the dark matter. The bino-like LSP can decay through the SO(10) gauge interactions, if one right-handed (RH) neutrino (ν<SUB>1</SUB><SUP>c</SUP>) is lighter than the LSP and its superpartner (ν@?<SUB>1</SUB><SUP>c</SUP>) develops a vacuum expectation value (VEV), raising extremely small R-parity violation naturally. The leptonic decay modes can be dominant, if the VEV scale of 16<SUB>H</SUB> is a few orders of magnitude lower than the VEV of 45<SUB>H</SUB> (∼10<SUP>16</SUP> GeV), and if a slepton (e@?<SUB>1</SUB><SUP>c</SUP>) is relatively lighter than squarks. The desired decay rate of the LSP, Γ<SUB>&</SUB>chi;∼10<SUP>-26</SUP> s<SUP>-1</SUP> to explain PAMELA data can be naturally achieved, because the gaugino mediating the LSP decay is superheavy. From PAMELA data, the SU(3)<SUB>c</SUB>xSU(2)<SUB>L</SUB>xSU(2)<SUB>R</SUB>xU(1)<SUB>B-L</SUB> breaking scale (or the 16<SUB>H</SUB> VEV scale) can be determined. A global symmetry is necessary to suppress the Yukawa couplings between one RH (s)neutrino and the MSSM fields. Even if one RH neutrino is quite light, the seesaw mechanism providing the extremely light three physical neutrinos and their oscillations is still at work.