Generalized gravity and a ghost
Generalized gravity and a ghost
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DOI：
10.1088/1475-7516/2005/03/008
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发表时间：
2005-02
影响因子：
6.4
通讯作者：
T. Chiba
中科院分区：
文献类型：
--
作者：
T. Chiba
我们证明了包含Ricci张量和Riemann张量以及Ricci标量的曲率不变量的广义引力理论等价于包含四阶导数项的多标量张量引力。通过将作用量在真空时空中展开，将作用量约化为具有四阶导数项的爱因斯坦引力，从而在这种广义引力理论中，除了有质量的自旋为0的场外，还出现了有质量的自旋为2的鬼场。
We show that generalized gravity theories involving the curvature invariants of the Ricci tensor and the Riemann tensor as well as the Ricci scalar are equivalent to multi-scalar–tensor gravities with four-derivative terms. By expanding the action around a vacuum spacetime, the action is reduced to that of the Einstein gravity with four-derivative terms, and consequently there appears a massive spin-2 ghost in such generalized gravity theories in addition to a massive spin-0 field.