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arXiv 1105.5632hep-th
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从共形引力到爱因斯坦引力

Einstein Gravity from Conformal Gravity

Juan Maldacena

摘要:

我们证明了四维共形引力加上一个简单的Neumann边界条件可以用来得到四维渐近deSitter或Euclidean anti-de Sitter时空宇宙的半经典(或树水平)波函数.这个简单的诺依曼边界条件从众多的共形引力解中选择了爱因斯坦解。因此,它从这个计算中消除了共形引力的幽灵。在宇宙学常数为正的五维纯引力理论中,我们证明了四维空间切片的晚期超视界树级概率测度$|Ψ[ g ]|^2$是由四维共形引力的作用给出的.

英文摘要:

We show that that four dimensional conformal gravity plus a simple Neumann boundary condition can be used to get the semiclassical (or tree level) wavefunction of the universe of four dimensional asymptotically de-Sitter or Euclidean anti-de Sitter spacetimes. This simple Neumann boundary condition selects the Einstein solution out of the more numerous solutions of conformal gravity. It thus removes the ghosts of conformal gravity from this computation. In the case of a five dimensional pure gravity theory with a positive cosmological constant we show that the late time superhorizon tree level probability measure, $|Ψ[ g ]|^2$, for its four dimensional spatial slices is given by the action of Euclidean four dimensional conformal gravity.

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