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arXiv 0806.4129math-phmath.MP
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类Maxwell引力理论在Minkowski时空和等价Lorentz时空中的规范固定

Gauge Fixing in the Maxwell Like Gravitational Theory in Minkowski Spacetime and in the Equivalent Lorentzian Spacetime

Roldao da Rocha, Waldyr A. Rodrigues

摘要:

在以前的文章中,我们研究了引力场的拉格朗日场论(引力场在那里由闵可夫斯基时空上的正交余标架丛的一个截面g^a表示)。在适当的条件下,这种理论已被证明等价于一个洛伦兹时空结构,其中度规张量满足爱因斯坦场方程。在这里,我们首先回顾一下,根据量子场论的思想,引力是由一个可能存在于闵可夫斯基时空中的大质量引力子场(由物质场产生并与自身耦合)的拉格朗日理论描述的。此外,引力子场被假设为一个对称张量场h,它带有洛伦兹群的自旋2和0的表示。这样的场,然后(众所周知),必须满足规范条件由方程。(3)下面接下来,我们引入一个将h与1-形式域g^a联系起来的代数。然后,使用Clifford丛形式主义,从我们的拉格朗日理论,引力子的精确波动方程和调查的规范条件的作用给出方程。(3)在闵可夫斯基时空中,引力场和物质场的能量-动量张量得到了可靠的守恒定律。最后,我们提出一个问题:Eq。(3)在我们的理论中,有效洛伦兹时空结构的场g代表场h,是否确定了场g的规范条件?我们证明,没有规范条件是固定的先验,是在广义相对论的情况下。此外,我们还研究了在什么条件下可以修正Logan规范条件。

英文摘要:

In a previous paper we investigate a Lagrangian field theory for the gravitational field (which is there represented by a section g^a of the orthonormal coframe bundle over Minkowski spacetime. Such theory, under appropriate conditions, has been proved to be equivalent to a Lorentzian spacetime structure, where the metric tensor satisfies Einstein field equations. Here, we first recall that according to quantum field theory ideas gravitation is described by a Lagrangian theory of a possible massive graviton field (generated by matter fields and coupling also to itself) living in Minkowski spacetime. The graviton field is moreover supposed to be represented by a symmetric tensor field h carrying the representations of spin two and zero of the Lorentz group. Such a field, then (as it is well known), must necessarily satisfy the gauge condition given by Eq.(3) below. Next, we introduce an ansatz relating h to the 1-form fields g^a. Then, using the Clifford bundle formalism we derive, from our Lagrangian theory, the exact wave equation for the graviton and investigate the role of the gauge condition given by Eq.(3) in obtaining a reliable conservation law for the energy-momentum tensor of the gravitational plus the matter fields in Minkowski spacetime. Finally we ask the question: does Eq.(3) fix any gauge condition for the field g of the effective Lorentzian spacetime structure that represents the field h in our theory? We show that no gauge condition is fixed a priory, as is the case in General Relativity. Moreover we investigate under which conditions we may fix Logunov gauge condition.

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