Discrete gravity and and its continuum limit

Details Discrete gravity and and its continuum limit Discrete gravity and and its continuum limit

2003-05-26

arxiv.org/abs/gr-qc/0305095v2

Mod.Phys.Lett.A20:213-225,2005

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

16 pages,revised version published in MPLA

Scientific paper

10.1142/S0217732305015793

Recently Gambini and Pullin proposed a new consistent discrete approach to quantum gravity and applied it to cosmological models. One remarkable result of this approach is that the cosmological singularity can be avoided in a general fashion. However, whether the continuum limit of such discretized theories exists is model dependent. In the case of massless scalar field coupled to gravity with $\Lambda=0$, the continuum limit can only be achieved by fine tuning the recurrence constant. We regard this failure as the implication that cosmological constant should vary with time. For this reason we replace the massless scalar field by Chaplygin gas which may contribute an effective cosmological constant term with the evolution of the universe. It turns out that the continuum limit can be reached in this case indeed.

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