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arXiv 1607.06261gr-qc
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共形标量和挠率不一致

Conformal scalar and torsion do not go together

Subhasish Chakrabarty, Amitabha Lahiri

摘要:

研究了四元$e^I_μ$和自旋联系$A^{IJ}_μ$下的Vierbein-Einstein-Palatini(VEP)作用量的保角变换.除非满足运动方程,否则自旋连接的变换是不确定的离壳变换。我们构造了无挠VEP形式的共形不变标量场。在费米子物质的存在下,挠率并不消失,而是表现在共形标量的动力学中,影响了不变性。当费米子存在时,不可能保持标量场方程的共形不变性。

英文摘要:

We investigate the conformal transformation of vierbein-Einstein-Palatini (VEP) action in terms of tetrads $e^I_μ$ and spin connection $A^{IJ}_μ$. The transformation of the spin connection is indeterminate off-shell unless equations of motion are satisfied. We construct the conformally invariant scalar field in the torsion-free VEP formalism. In presence of fermionic matter, torsion does not vanish, and shows up in the dynamics of conformal scalar, affecting the invariance. It is not possible to maintain conformal invariance of the scalar field equation when fermions are present.

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