If there is no change at all you have no new information and thus are unaware of anything going on because there is nothing new going on.
No beginning and no end? Sounds like God.
Interesting theory. But if the universe has existed for an infinite amount of time already, why hasn't it long since run out of fuel for stars?
This theory may well have an answer to that question. But if not, the theory has some issues that need resolving.
...what came before, by asking what caused it?
without invoking a supernatural being
why hasn't it long since run out of fuel for stars?
It has existed for 13.8 billion years
new Big Bang in a new dimension
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 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. Classical geodesics eventually cross each other, and the points at which they converge are singularities. In contrast, Bohmian trajectories never cross each other, so singularities do not appear in the equations.
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. The terms also make predictions that agree closely with current observations of the cosmological constant and density of the universe.