A unified field theory of mesons and baryons

Skyrme, T. H. R.

doi:10.1016/0029-5582(62)90775-7

Cited by 2,313 publications

(1,442 citation statements)

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“…It is natural to ask whether this intrinsic state approximation is also applicable in studying the nucleon. One obvious example is the Skyrme model [50,51], in which a single intrinsic soliton state generates an infinite band of collective spin-isopin rotations, with the spin-1/2 isospin-1/2 nucleon being the lowest state and the spin-3/2 isospin-3/2 ∆ being the first excited state. It is clear, however, that the Skryme model cannot be a quantitative model of the nucleon and ∆, since the infinite tower of predicted additional states are not observed in Nature.…”

Section: Discussionmentioning

confidence: 99%

Quark transverse charge densities in the from lattice QCD

et al. 2009

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We extend the formalism relating electromagnetic form factors to transverse quark charge densities in the light-front frame to the case of a spin-3/2 baryon and calculate these transverse densities for the ∆(1232) isobar using lattice QCD. The transverse charge densities for a transversely polarized spin-3/2 particle are characterized by monopole, dipole, quadrupole, and octupole patterns representing the structure beyond that of a pure point-like spin-3/2 particle. We present lattice QCD results for the ∆-isobar electromagnetic form factors for pion masses down to approximatively 350 MeV for three cases: quenched QCD, two-degenerate flavors of dynamical Wilson quarks, and three flavors of quarks using a mixed action that combines domain wall valence quarks and dynamical staggered sea quarks. We extract transverse quark charge densities from these lattice results and find that the ∆ is prolately deformed, as indicated by the fact that the quadrupole moment G E2 (0) is larger than the value −3 characterizing a point particle and the fact that the transverse charge density in a ∆ + of maximal transverse spin projection is elongated along the axis of the spin.

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Section: Discussionmentioning

confidence: 99%

Quark transverse charge densities in the from lattice QCD

et al. 2009

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“…Skyrmion 10 , a vortex-like topological spin texture where the spins point in all directions wrapping a sphere, is recently discovered in chiral-lattice magnets with the DzyaloshinskiiMoriya (DM) interaction such as MnSi, Fe 1 À x Co x Si and FeGe. The DM interaction naturally leads to a helical spin order (HL), which turns into a triangular skyrmion crystal (SkX) under an external magnetic field B (refs 11,12) as observed in a narrow region of the B-T phase diagram for bulk samples by neutronscattering experiments 13 .…”

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confidence: 99%

Universal current-velocity relation of skyrmion motion in chiral magnets

2013

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Current-driven motion of the magnetic domain wall in ferromagnets is attracting intense attention because of potential applications such as racetrack memory. There, the critical current density to drive the motion is B10 9 -10 12 A m À 2 . The skyrmions recently discovered in chiral magnets have much smaller critical current density of B10 5 -10 6 A m À 2 , but the microscopic mechanism is not yet explored. Here we present a numerical simulation of Landau-Lifshitz-Gilbert equation, which reveals a remarkably robust and universal currentvelocity relation of the skyrmion motion driven by the spin-transfer-torque unaffected by either impurities or nonadiabatic effect in sharp contrast to the case of domain wall or spin helix. Simulation results are analysed using a theory based on Thiele's equation, and it is concluded that this behaviour is due to the Magnus force and flexible shape-deformation of individual skyrmions and skyrmion crystal, which enable them to avoid pinning centres.

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“…Remarkably, in the absence of the ρ-meson, this effective theory reduces to the Skyrme model [4] in Euclidean space-time:…”

Section: Holographic Qcdmentioning

confidence: 99%

“…Since the ΛΛ threshold is experimentally 2231 MeV, this model calculation implies that the H-dibaryon mass may be stable against the strong decay into ΛΛ. Several years later, the H-dibaryon was also investigated [2,3] in the Skyrme model [4], where baryons are described as chiral solitons. This investigation suggests that the H-dibaryon mass is smaller than mass of two nucleons in the chiral limit.…”

Section: Introductionmentioning

confidence: 99%

A Study of the H-dibaryon in Holographic QCD

Matsumoto

Nakagawa

Suganuma

2017

Proceedings of the 14th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU2016)

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We study the H-dibaryon (uuddss) in holographic QCD for the first time. Holographic QCD is derived from a QCD-equivalent D-brane system (S 1 -compactified D4/D8/D8) in the superstring theory via the gauge/gravity correspondence. In holographic QCD, all baryons appear as topological chiral solitons of Nambu-Goldstone bosons and (axial) vector mesons. In this framework, the H-dibaryon can be described as an SO(3)-type hedgehog state. We present the formalism of the H-dibaryon in holographic QCD, and perform the calculation to investigate its properties in the chiral limit.

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A unified field theory of mesons and baryons

Cited by 2,313 publications

References 1 publication

Quark transverse charge densities in the from lattice QCD

Quark transverse charge densities in the from lattice QCD

Universal current-velocity relation of skyrmion motion in chiral magnets

A Study of the H-dibaryon in Holographic QCD

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