Majumder, BarunBarunMajumder2025-08-302025-08-302013-11-0110.1142/S021827181350079X2-s2.0-84883292463https://d8.irins.org/handle/IITG2025/21131Isotropic quantum cosmological perfect fluid model is studied in the formalism of Rainbow gravity. It is found that the only surviving matter degree of freedom played the role of cosmic time. With the suitable choice of the Rainbow functions it is possible to find the wave packet naturally from the superposition of the wave functions of the Schrödinger-Wheeler-deWitt equation. The many-worlds interpretation of quantum mechanics is applied to investigate the behavior of the scale factor and the behavior is found to depend on the operator ordering. It is shown that the model in the Rainbow framework may avoid singularity yielding a bouncing nonsingular universe. © 2013 World Scientific Publishing Company.falseperfect fluid | quantum cosmology | Rainbow universeArticlehttps://arxiv.org/pdf/1307.5273November 2013201350079arJournal18