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arXiv 1111.6660hep-th
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精确可解模型与自发对称性破缺

Exactly solvable models and spontaneous symmetry breaking

Lubomir Martinovic

摘要:

我们研究了几个在哈密顿框架下,在传统的和光阵面形式的场论中,有质量和无质量费米子的二维模型。新的成分是一个修改的规范程序,考虑到解决方案的运营商场方程。在总结了导数耦合和Thirring模型的主要结果后,我们简要地比较了Federbush模型的常规和光前版本,包括大规模电流玻色子化和Bogoliubov变换对角化的哈密顿量。然后,我们勾勒出我们的哈密顿方法的扩展到二维Nambu-Jona-Lasinio模型和Thirring-Wess模型。最后,我们讨论了协变规范中的Schwinger模型。特别指出,Lowenstein和Swieca的解意味着物理真空是一个有质量标量场的相干态,并提出了一个新的真空简并度公式.

英文摘要:

We study a few two-dimensional models with massive and massless fermions in the hamiltonian framework and in both conventional and light-front forms of field theory. The new ingredient is a modification of the canonical procedure by taking into account solutions of the operator field equations. After summarizing the main results for the derivative-coupling and the Thirring models, we briefly compare conventional and light-front versions of the Federbush model including the massive current bosonization and a Bogoliubov transformation to diagonalize the Hamiltonian. Then we sketch an extension of our hamiltonian approach to the two-dimensional Nambu--Jona-Lasinio model and the Thirring--Wess models. Finally, we discuss the Schwinger model in a covariant gauge. In particular, we point out that the solution due to Lowenstein and Swieca implies the physical vacuum in terms of a coherent state of massive scalar field and suggest a new formulation of the model's vacuum degeneracy.

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