1,339 research outputs found
An Interesting Fitting of Quark Masses
In this note we show an empirical formula of quark masses, which is found by
implementing a least squares fit. In this formula the measured QCD coupling is
almost a "best fitting coupling".Comment: 5 pages, 2 figure
Orbital density wave induced by electron-lattice coupling in orthorhombic iron pnictides
In this paper we explore the magnetic and orbital properties closely related
to a tetragonal-orthorhombic structural phase transition in iron pnictides
based on both two- and five-orbital Hubbard models. The electron-lattice
coupling, which interplays with electronic interaction, is self-consistently
treated. Our results reveal that the orbital polarization stabilizes the spin
density wave (SDW) order in both tetragonal and orthorhombic phases. However,
the ferro-orbital density wave (F-ODW) only occurs in the orthorhombic phase
rather than in the tetragonal one. Magnetic moments of Fe are small in the
intermediate Coulomb interaction region for the striped antiferromangnetic
phase in the realistic five orbital model. The anisotropic Fermi surface in the
SDW/ODW orthorhombic phase is well in agreement with the recent angle-resolved
photoemission spectroscopy experiments. These results suggest a scenario that
the magnetic phase transition is driven by the ODW order mainly arising from
the electron-lattice coupling.Comment: 21 pages, 10 figure
The First Calculation for the Mass of the Ground Glueball State on Lattice
Under the quenched approximation, we perform a lattice calculation for the
mass of the ground glueball state in channel on a
lattice. Our calculation shows that the mass of this state is
, which rules out the or mainly
glueball interpretation for .Comment: 10 pages and 1 figur
Possible -wave superconductivity in LaNiO
Recently, the bulk nickelate LaNiO is reported to show signature
of high-temperature superconductivity under high pressure above GPa (H. Sun
{\it et al.}, arXiv:2305.09586). We analyze the pairing mechanism and pairing
symmetry in a bi-layer Hubbard model with two orbitals in the multiplet.
In the weak to moderate interaction regime, our functional renormalization
group calculations yield -wave Cooper pairing with dominant
-orbital content, triggered by spin fluctuations at wave vectors
near and , up to symmetry. The gap
function changes sign across the Fermi pockets. In the strong coupling limit,
we develop a low-energy effective theory in terms of atomic one- and
two-electron states in the multiplet. The effective theory predicts
naturally local pairing (with anti-phase between the two orbitals due to the
repulsive inter-orbital pair hopping) and strong singlet pairing on vertical
inter-layer bond, where the super-exchange between -orbital is
the strongest. The real-space structure is consistent with that from functional
renormalization group, suggesting the robustness of such a pairing function. We
also discuss a possible scenario for the weak insulating behavior under low
pressures in terms of the tendency toward the formation of charge order in the
strong coupling limit.Comment: 5 pages, 4 figure
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γ-Tocotrienol Induces Paraptosis-Like Cell Death in Human Colon Carcinoma SW620 Cells
Colorectal cancer is one of the most serious illnesses among diagnosed cancer. As a new type of anti-cancer composition from tocotrienol-rich fraction of palm oil, γ-tocotrienol is widely used in anti-cancer research. The objectives of this study were to investigate the effects of γ-tocotrienol on human colon cancer SW620 and HCT-8 cells. We showed that treatment with different concentrations of γ-tocotrienol resulted in a dose dependent inhibition of cell growth. Cell death induced by γ-tocotrienol was mediated by a paraptosis-like cell death in SW620 and HCT-8 cells. Real-time RT-PCR and western blot analyses showed that γ-tocotrienol inhibited the expression level of β-catenin, cyclin D1 and c-jun. These data suggest that a paraptosis-like cell death induced by γ-tocotrienol in SW620 cells is associated with the suppression of the Wnt signaling pathway, which offers a novel tool for treating apoptosis-resistance colon cancer
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