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arXiv 1706.05804hep-thgr-qc
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量子引力中的Weinberg's No Go定理

Weinberg's No Go Theorem in Quantum Gravity

Ichiro Oda

摘要:

任何提出解决宇宙学常数问题的模型都要面对的一个重要障碍是温伯格的古老的不走定理。这个定理指出,没有任何局部场方程,包括经典引力,可以有一个平坦的闵可夫斯基解决方案的一般值的参数,换句话说,不去定理禁止存在任何解决方案的宇宙学常数问题的局部场论没有微调。虽然原来的温伯格定理只在经典引力中成立,但本文证明了这个定理在量子引力中也成立。我们的证明是非常一般的,因为它利用了一般坐标不变性规范固定后出现的BRST不变性,而不依赖于量子引力的细节。

英文摘要:

An important hurdle to be faced by any model proposing a resolution to the cosmological constant problem is Weinberg's venerable no go theorem. This theorem states that no local field equations including classical gravity can have a flat Minkowski solution for generic values of the parameters, in other words, the no go theorem forbids the existence of any solution to the cosmological constant problem within local field theories without fine tuning. Though the original Weinberg theorem is valid only in classical gravity, in this article we prove that this theorem holds even in quantum gravity. Our proof is very general since it makes use of the BRST invariance emerging after gauge-fixing of general coordinate invariance and does not depend on the detail of quantum gravity.

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