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VOLUME 80 (2004) | ISSUE 7 | PAGE 531
On thermodynamic and quantum fluctuations of cosmological constant
We discuss from the condensed-matter point of view the recent idea that the Poisson fluctuations of cosmological constant about zero could be a source of the observed dark energy [Padmanabhan,Ahmed]. We argue that the thermodynamic fluctuations of Λ are much bigger. Since the amplitude of fluctuations is \propto V^{-1/2} where V is the volume of the Universe, the present constraint on the cosmological constant provides the lower limit for V, which is much bigger than the volume within the cosmological horizon.