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### Interpretation of Dark Energy in Evolving Quantum Cosmology

#### Abstract

Quantum gravity (QG) is a wide-range physical model intended for understanding built-in cosmological quantum phenomena on small scale as well as large scale distances. So far, progress in this direction is nominal and the general theory of relativity (GTR) needs serious review with reference to ‘quantum cosmology’. In this context, assuming that the Planck scale Hubble parameter and Mach’s principle play a crucial role in cosmic evolution, we propose a toy model of evolving flat space quantum cosmology. We would like to suggest that:1) cosmic temperature is directly proportional to the cosmic ordinary matter density and current ordinary matter density and is about 0.0434 times the current critical density; 2) the current cosmic radius is about 11.13Gpc and seems to constitute around 18 Hubble spheres; 3) the current dark energy density can be identified with energy density spent in passing from current expected critical temperature to current actual temperature; 4) the ratio of current critical temperature to current actual temperature can be called the current thermal stretching factor and seems to be connected to the ratio of the Planck scale and current Hubble parameters; and 5) the Planck scale expansion velocity is 1.414

*c*and the current expansion velocity is 2.60*c.*