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arXiv 0904.0089hep-thgr-qchep-ph
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引力Higgs机制的广义张量拉格朗日量

General Tensor Lagrangians from Gravitational Higgs Mechanism

Durmus A. Demir, N. K. Pak

摘要:

t Hooft在arXiv:0708.3184中提出的引力Higgs机制涉及时空度规g_{mu nu}以及与η_{a b} \partial_{mu} <$^a \partial_{nu} <$^b成比例的诱导度规\bar{g}_{mu nu},其中<$^{a}(a=0,. 3),我们称之为,通过与x^a成比例的真空期望值<^a >,自发地打破所有四个超同态。在这个框架中,我们构造和分析最一般的行动密度的各种不变量,涉及曲率张量,连接系数,收缩和两个度量场的行列式。我们证明了这个作用量允许关于平坦背景的一致展开,使得由此产生的拉格朗日量具有在具有Fierz-Pauli质量项的线性化Einstein-Hilbert拉格朗日量中没有的几个新特征(LELHL-FP):(i)它的动力学部分通过用由不变量产生的某些系数对相应的结构进行加权来推广LELHL-FP的动力学部分,(ii)整个拉格朗日是鬼-和快子-免费的质量条款不一定在菲尔兹-泡利形式,和,(iii)一个一致的质量条款产生没有明显的需要更高的导数耦合。

英文摘要:

The gravitational Higgs mechanism proposed by 't Hooft in arXiv:0708.3184 involves the spacetime metric g_{mu nu} as well as the induced metric \bar{g}_{mu nu} proportional to η_{a b} \partial_{mu} ϕ^a \partial_{nu} ϕ^b where ϕ^{a} (a=0,...,3), as we call it, break all four diffeomorphisms spontaneously via the vacuum expectation values < ϕ^a > proportional to x^a. In this framework, we construct and analyze the most general action density in terms of various invariants involving the curvature tensors, connexion coefficients, and the contractions and the determinants of the two metric fields. We show that this action admits a consistent expansion about the flat background such that the resulting Lagrangian possesses several novel features not found in the linearized Einstein-Hilbert Lagrangian with Fierz-Pauli mass term (LELHL-FP): (i) its kinetic part generalizes that of LELHL-FP by weighing the corresponding structures with certain coefficients generated by invariants, (ii) the entire Lagrangian is ghost-- and tachyon--free for mass terms not necessarily in the Fierz-Pauli form, and, (iii) a consistent mass term is generated with no apparent need to higher derivative couplings.

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。

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