arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1006.3754hep-th
收藏

极限婴儿Skyrme模型中的紧夸克和半紧夸克

Compactons and semi-compactons in the extreme baby Skyrme model

J. M. Speight

摘要:

研究了静态baby Skyrme模型在能量泛函中只包含势能项和Skyrme项而不包含Dirichlet能量项的极限情形.结果表明,该模型与潜在的$V=\frac12(1+ϕ_3)^2$具有非常不寻常的本地化性质,我们称之为半的解决方案。这些能量最小化的程度1同伦类,支持包含在一个半无限的矩形带,并沿着带的长度衰减为$x^{-\log x}$。通过将几个半同伦粘在一起,证明了每一个同伦类都有任意高的线性稳定解,但能量是量子化的。对于各种其他选择的潜力,电子自旋共振被构造与支持在一个封闭的磁盘,或在一个封闭的环。在后一种情况下,人们可以构造更高的缠绕线,以及复杂的叠加,其中几个封闭的弦状线相互嵌套。的建设大量使用的不变性的模型下保持面积的同构,和拓扑较低的能量界,这两者都是建立在一个一般的几何设置。所有的解都是经典的,也就是说,它们(至少)是两次连续可微的,并且处处满足模型的欧拉-拉格朗日方程。

英文摘要:

The static baby Skyrme model is investigated in the extreme limit where the energy functional contains only the potential and Skyrme terms, but not the Dirichlet energy term. It is shown that the model with potential $V=\frac12(1+ϕ_3)^2$ possesses solutions with extremely unusual localization properties, which we call semi-compactons. These minimize energy in the degree 1 homotopy class, have support contained in a semi-infinite rectangular strip, and decay along the length of the strip as $x^{-\log x}$. By gluing together several semi-compactons, it is shown that every homotopy class has linearly stable solutions of arbitrarily high, but quantized, energy. For various other choices of potential, compactons are constructed with support in a closed disk, or in a closed annulus. In the latter case, one can construct higher winding compactons, and complicated superpositions in which several closed string-like compactons are nested within one another. The constructions make heavy use of the invariance of the model under area-preserving diffeomorphisms, and of a topological lower energy bound, both of which are established in a general geometric setting. All the solutions presented are classical, that is, they are (at least) twice continuously differentiable and satisfy the Euler-Lagrange equation of the model everywhere.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑