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Paper IPM / Physic / 6695  


Abstract:  
Recently,13 it is shown that, the quantum effects of matter are well described by the conformal degree of freedom of the spacetime metric. On the other hand, it is a wellknown fact that according to Einstein's gravity theory, gravity and geometry are interconnected. In the new quantum gravity theory,13 matter quantum effects completely determine the conformal degree of freedom of the spacetime metric, while the causal structure of the spacetime is determined by the gravitational effects of the matter, as well as the quantum effects through back reaction effects. This idea, previously, is realized in the framework of scalartensor theories. In this work, it is shown that quantum gravity theory can also be realized as a purely metric theory. Such a theory is developed, its consequences and its properties are investigated. The theory is applied, then, to black holes and the radiationdominated universe. It is shown that the initial singularity can be avoided.
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