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arXiv 0809.0684hep-th
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具有非拓扑孤子解的相对论拉格朗日场论研究

A study on relativistic lagrangian field theories with non-topological soliton solutions

J. Diaz-Alonso, D. Rubiera-Garcia

摘要:

本文对两类具有静态球对称非拓扑孤子解的相对论拉格朗日场论的动力学结构进行了一般性分析。分析了紧致半单李群的(多)标量场和广义规范场。控制(多)标量场动力学的拉格朗日密度被假定为动力学项的一般函数,而规范不变的拉格朗日量是场不变量的一般函数。这些功能受到规则性,正能量和真空能量消失的要求的约束,定义了我们所谓的“可接受”模型。在标量的情况下,我们建立的一般条件,确定详尽的家庭可容许拉格朗日模型支持这种有限能量的解决方案。我们分析了这些不同的家庭,这是由相应的类粒子的解决方案的领域的渐近和中心行为定义的一些明确的例子。通过能量泛函的变分分析,我们证明了标量孤子的可容许性约束和能量的有限性是其对保电荷小扰动的线性静态稳定性的充分必要条件.此外,我们进行了一般的频谱分析的动态演化的小扰动周围的静态稳定孤子,建立其动态稳定性。接下来,我们考虑多分量标量场的情况下,表明在这种情况下的粒子类场问题的分辨率降低到单分量的情况。对这些标量模型的研究是规范场分析的必要步骤。

英文摘要:

We perform a general analysis of the dynamic structure of two classes of relativistic lagrangian field theories exhibiting static spherically symmetric non-topological soliton solutions. The analysis is concerned with (multi-) scalar fields and generalized gauge fields of compact semi-simple Lie groups. The lagrangian densities governing the dynamics of the (multi-) scalar fields are assumed to be general functions of the kinetic terms, whereas the gauge-invariant lagrangians are general functions of the field invariants. These functions are constrained by requirements of regularity, positivity of the energy and vanishing of the vacuum energy, defining what we call "admissible" models. In the scalar case we establish the general conditions which determine exhaustively the families of admissible lagrangian models supporting this kind of finite-energy solutions. We analyze some explicit examples of these different families, which are defined by the asymptotic and central behaviour of the fields of the corresponding particle-like solutions. From the variational analysis of the energy functional, we show that the admissibility constraints and the finiteness of the energy of the scalar solitons are necessary and sufficient conditions for their linear static stability against small charge-preserving perturbations. Furthermore we perform a general spectral analysis of the dynamic evolution of the small perturbations around the statically stable solitons, establishing their dynamic stability. Next, we consider the case of many-components scalar fields, showing that the resolution of the particle-like field problem in this case reduces to that of the one-component case. The study of these scalar models is a necessary step in the analysis of the gauge fields.

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