Author： Hu B.L. Phillip N.G.
Publisher： Springer Publishing Company
ISSN： 0020-7748
Source： International Journal of Theoretical Physics, Vol.39, Iss.7, 2000-07, pp. : 1817-1830
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Abstract
From calculations of the variance, or the fluctuations, and the mean energy density of a massless scalar field in the Minkowski vacuum as a function of an intrinsic scale defined by the world function between two nearby points (as used in point separation regularization), we show that, contrary to prior claims, the ratio of variance to its mean squared being of the order unity does not imply a failure of semiclassical gravity. It is more a consequence of the quantum nature of the state of the matter field than any inadequacy of the theory of spacetime with quantum matter as source.
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