http://arxiv.org/abs/1603.04170(adsbygoogle = window.adsbygoogle || []).push({});

Effective cosmological constant induced by stochastic fluctuations of Newton's constant

Marco de Cesare, Fedele Lizzi, Mairi Sakellariadou

(Submitted on 14 Mar 2016)

We consider implications of the microscopic dynamics of spacetime for the evolution of cosmological models.We argue that quantum geometry effects may lead to stochastic fluctuations of the gravitational constant,which is thus considered as a macroscopic effective dynamical quantity. Consistency with Riemannian geometry entails the presence of a time-dependent dark energy term in the modified field equations, which can be expressed in terms of the dynamical gravitational constant.We suggest that the late-time accelerated expansion of the Universe may be ascribed to quantum fluctuations in the geometry of spacetime rather than the vacuum energy from the matter sector.

10 pages, 1 figure

In other words the cosmological constant Λ is seen as a QUANTUM GRAVITY EFFECT.

"quantum fluctuations in the geometry of spacetime" are the key here

"rather than the vacuum energy from the matter sector"

The conclusion is:

"...quantum geometry effects may lead to stochastic fluctuations of the gravitational constant"

which could reasonably average out, according to their calculation, in the observed late-time acceleration.

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# A Effective cosmo const explained w/o vacuum energy

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