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Bumseok Kyae

Publications and source records attributed to Bumseok Kyae.

78 records · Page 5Linked to original sources
arXiv2000

Exact Cosmological Solution and Modulus Stabilization in the Randall-Sundrum Model with Bulk Matter

We provide the exact time-dependent cosmological solutions in the Randall-Sundrum (RS) setup with bulk matter, which may be smoothly connected to the static RS metric. In the static limit of the extra dimension, the solutions are reduced to the standard Friedmann equations. In view of our solutions, we also propose an explanation for how the extra dimension is stabilized in spite of a flat modulus potential at the classical level.

hep-th↗
arXiv1999

Effective Gauss-Bonnet Interaction in Randall-Sundrum Compactification

The effective gravitational interaction below the Planck scale in the Randall-Sundrum world is shown to be the Gauss-Bonnet term. In this theory we find that there exists another static solution with a positive bulk cosmological constant. Also, there exist solutions for positive visible sector cosmological constant, which are needed for a later Friedman-Robertson-Walker universe.

hep-ph↗
arXiv1999

Constraints on Parameters of the R_F Parity Model from Quark and Neutrino Mass Matrices

The forms of quark and lepton mass matrices are severely restricted in the $R_F$ parity model. We determine the form of the quark mass matrix first and derive the form of the neutrino mass matrix. For this to be consistent with the present experiments, we conclude that the masses of the superpartners of the right--handed down-type squarks and sneutrino vacuum expectation values satisfy, ${m_{\tilde{d}_{Rj}}}\vmu \gtrsim 400 ~{\rm GeV}^2 $ or ${m_{\tilde{d}_{Rj}}}\vtau \gtrsim 400 ~{\rm GeV}^2 $. We also find that without a sterile neutrino it is difficult to obtain a large mixing angle solution of $ν_μ$ and $ν_τ$. With a sterile neutrino, we show a possibility for a large mixing angle solution of $ν_μ$ with $ν_{\rm sterile}$.

hep-ph↗
arXiv1998

R_F Parity and Almost Massless Up Quark

We introduce a parity $R_F$ to introduce naturally small masses for the first family members and in particular almost massless $u$ quark toward the strong CP solution. We also discuss the phenomenological implications of this model on the proton decay and the neutrino mass. Furthermore, it is possible to embed this $R_F$ parity to local $U(1)_R$ gauge symmetry.

hep-ph↗
arXiv1998

Large Cosmological Light Element Bound on R Parity Violating Parameters

In R parity violating theories, there does not exist the {\it stable} lightest supersymmetric particle (LSP). The LSP, $χ$, of MSSM decays to lighter ordinary particles with dimension 6 effective R violating interaction terms. Since the lifetime of $χ$ can be sufficiently long for small R-violating couplings, it can affect the standard nucleosynthesis scenario. This constraint gives an upper limit for the lifetime of $χ$ in the small $τ_χ$ region; $\simτ_χ>10^6$ s. This translates to the sum of squared R-violating couplings, for $m_χ=$ 60 GeV in the photino (bino) limit, $(0.12 (0.05)|λ_{i,j,k}|^2+0.31(0.07) |λ^\prime_{i,j\ne 3,k}|^2 +0.04(0.04)|λ^{\prime}_{i,3,k}|^2 +0.23(0.12)|λ_{i,j,k}^{\prime\prime}(i 7.7\times 10^{-24}$.

hep-ph↗