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arXiv 0803.1620gr-qc
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引力场的指数拉格朗日量与真空能问题

Exponential Lagrangian for the Gravitational Field and the problem of Vacuum Energy

O. M. Lecian, G. Montani

摘要:

我们将分析指数引力拉格朗日量的两个特殊特征。一方面,虽然拉格朗日密度的这种选择允许两个自由参数,但只有一个尺度,即宇宙学常数,在正确的爱因斯坦极限被恢复时作为基本尺度出现。另一方面,真空能量产生于$f(R)$理论,使得$f(0)\neq 0$需要一种抵消机制,通过这种机制,宇宙学常数的当前值可以被重铸。

英文摘要:

We will analyze two particular features of an exponential gravitational Lagrangian. On the one hand, while this choice of the Lagrangian density allows for two free parameters, only one scale, the cosmological constant, arises as fundamental when the proper Einsteinian limit is to be recovered. On the other hand, the vacuum energy arising from $f(R)$ theories such that $f(0)\neq 0$ needs a cancellation mechanism, by which the present value of the cosmological constant can be recast.

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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