In cosmological terms, the scientists explain that the quantum corrections can be thought of as a cosmological constant term (without the need for dark energy) and a radiation term.These terms keep the universe at a finite size, and therefore give it an infinite age.In general relativity, one possible fate of the universe is that it starts to shrink until it collapses in on itself in a big crunch and becomes an infinitely dense point once again.Ali and Das explain in their paper that their model avoids singularities because of a key difference between classical geodesics and Bohmian trajectories.Using the quantum-corrected Raychaudhuri equation, Ali and Das derived quantum-corrected Friedmann equations, which describe the expansion and evolution of universe (including the Big Bang) within the context of general relativity.
New gravity particle In physical terms, the model describes the universe as being filled with a quantum fluid.
Ali and Das also expect their results to hold even if and when a full theory of quantum gravity is formulated.
No singularities nor dark stuff In addition to not predicting a Big Bang singularity, the new model does not predict a "big crunch" singularity, either.
In a related paper, Das and another collaborator, Rajat Bhaduri of Mc Master University, Canada, have lent further credence to this model.
They show that gravitons can form a Bose-Einstein condensate (named after Einstein and another Indian physicist, Satyendranath Bose) at temperatures that were present in the universe at all epochs.