Doubly Strange Dibaryon in the Chiral Model

Balachandran, A. P.; Barducci, A.; Lizzi, Fedele; Rodgers, V.G.J.; Stern, A.

doi:10.1103/physrevlett.52.887

Cited by 180 publications

(144 citation statements)

References 16 publications

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“…A remarkable feature of the Skyrme action is that it allows for the existence of solitons (Skyrmions) that behave as Fermionic degrees of freedom, in spite of the fact that the basic fields are scalar. Furthermore, Skyrmions describe nucleons both theoretically and phenomenologically (see, e. g., [2][3][4][5][6][7][8][9][10][11][12][13][14]), where the identification of the winding number of the Skyrmion with the Baryon number in particle physics [2] plays a crucial role. Following [3,7], the possibility of treating the Skyrme solitons as Fermions was extended to curved spaces as well [15,16], opening the possibility for applying this theory to general relativity and astrophysics.…”

Section: Introductionmentioning

confidence: 99%

Cosmological Einstein-Skyrme solutions with nonvanishing topological charge

Canfora¹,

Paliathanasis²,

Taves³

et al. 2017

Phys. Rev. D

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Time-dependent analytic solutions of the Einstein-Skyrme system -gravitating Skyrmions-, with topological charge one are analyzed in detail. In particular, the question of whether these Skyrmions reach a spherically symmetric configuration for t → +∞ is discussed. It is shown that there is a static, spherically symmetric solution described by the Ermakov-Pinney system, which is fully integrable by algebraic methods. For Λ > 0 this spherically symmetric solution is found to be in a "neutral equilibrium" under small deformations, in the sense that under a small squashing it would neither blow up nor dissapear after a long time, but it would remain finite forever (plastic deformation). Thus, in a sense, the coupling with Einstein gravity spontaneously breaks the spherical symmetry of the solution. However, in spite of the lack of isotropy, for t → ∞ (and Λ > 0) the space time is locally flat and the anisotropy of the Skyrmion only reflects the squashing of spacetime.

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Section: Introductionmentioning

confidence: 99%

Cosmological Einstein-Skyrme solutions with nonvanishing topological charge

Canfora¹,

Paliathanasis²,

Taves³

et al. 2017

Phys. Rev. D

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“…It was necessary to include the higher derivative term (1. which was later confirmed [ 28]. The expression on the right hand side of (1 .11) measures the winding number of the map U(x) : s 3 ~ SU(2) = s 3 .…”

Section: Introductionmentioning

confidence: 57%

“…In this article we studied two simple types of classical solutions, but there may be others [28,30] probably with higher energy. The first was a static, but unstable, solution which excites only the p field and which we 30 called the p-sphaleron (another name proposed in [24] was 11 hadroid 11…”

Section: Discussionmentioning

confidence: 99%

Stable and unstable classical solutions in an effective gauge theory for low energy mesons

Klinkhamer

1986

Z. Phys. C - Particles and Fields

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-19807 (Rev.) We study the stability of two related classical solutions in an effective gauge theory, which correctly describes the properties of ~ and p mesons at low energies.· The first solution (sphaleron), which excites only the p field, with baryon number B = 0 and energy E = 1.5 GeV, is unstable. The second (Skyrmion), which excites both the~ and p fields, with B = 1 and E z 1.0 GeV, is perhaps stable locally. We show how to make this Skyrmion absolutely stable without raising its energy too much, both of which are desirable for identification with the nucleon. 'we comment on the potential of heavy ion collision experiments to study configuration space. The Skyrmion solution may also have some relevance for the electroweak interactions (now ·• E ~ 10 TeV).

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“…2231 MeV, (within a quark cluster model) [14] to a slightly bound state (within the chiral quark model) [15], or even an unbound state (from a lattice QCD calculation) [18]. The latter case seems unrealistic.…”

mentioning

confidence: 99%

H dibaryons and primordial nucleosynthesis

et al. 1998

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The apparent discrepancy between abundances of light nuclides predicted by the standard Big-Bang and observational data is explained, by assuming the presence of metastable H dibaryons at the nucleosynthesis era. These dibaryons could be formed out of a small fraction of strange quarks at the moment of the confinement transition. For a primordial deuterium abundance of the order of 3 × 10 −5 , the measured differences in the 4 He abundances requires a relative abundance of H dibaryons of the order of n H /n B ∼ 0.07, decaying in a timescale of the order of 10 5 s. , and it seems to be confirmed by new data with better Signal to Noise ratio [6], whilst the latter was obtained from the analysis of two QSO spectra [7], [8], [3]. At present, no convincing arguments were given in favor of one or other value, or even if these quite different measurements indicate a non-homogeneous distribution. Pacs

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Doubly Strange Dibaryon in the Chiral Model

Cited by 180 publications

References 16 publications

Cosmological Einstein-Skyrme solutions with nonvanishing topological charge

Cosmological Einstein-Skyrme solutions with nonvanishing topological charge

Stable and unstable classical solutions in an effective gauge theory for low energy mesons

H dibaryons and primordial nucleosynthesis

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