The more we explore, the more we learn.
The more we peer into the Universe, the more we understand how little we know and how much there is left to explore.
Now, a new cosmological model suggests that the Universe we live in has a mirror image in the form of an antiuniverse, present long before the Big Bang.
From what we understand in the Universe, we assume that time as we know it moves forward as the cosmos expands, and there’s much more matter than antimatter.
This seems to contradict a fundamental symmetry, referred to as the CPT symmetry.
This tells us that physics is unchanged when time, space, and matter-antimatter are all flipped.
And scientists have recently said that from a certain vantage point, our Universe does look lopsided.
In order to understand what’s going one, Latham Boyle, Kieran Finn, and Neil Turok from the Perimeter Institute for Theoretical Physics in Canada have come up with a new theory that tells us that the big bang was the starting point of a so-called ‘antiuniverse’ where time as we know it runs in the opposite direction.
There, antimatter dominates space.
As explained by Physics, researchers propose that the CPT-symmetric model is not only consistent with the known cosmic expansion history but also provides a straightforward explanation for dark matter.
As noted by experts, the CPT-symmetric model is an alternative to inflation, which suggests that our Universe lived through a short time of exponential growth right after the big bang.
And it is this rapid expansion right after the big bang which can help explain a number of observations made through the Universe.
However, it requires the existence of additional, still hypothetical quantum fields.
So, do we have to change our understanding of physics?
As explained by Boyle and his colleagues, their new model can explain the early evolution of the Universe without having to change much.
The new study suggests that in the CPT-symmetric model, time and space move continuously across the big bang, and the antiuniverse that exists in the negative time direction acts as a mirror reflection of our Universe.
And while the new study is appealing, the group of scientists still needs to demonstrate how their new model can reproduce the various observations that the inflation model explains, for example, the uniformity of the cosmos on large scales.
The inflation theory was first proposed in 1979 by theoretical physicist Alan Guth at Cornell University.
It explains the origin of the large-scale structure of the cosmos.
Interestingly, the new CPT-Symmetric model offers a natural explanation for Dark Matter: Such a universe would spawn large numbers of very massive sterile neutrinos.
This research is published in Physical Review Letters.