(ORDO NEWS) — The concept of a mirror universe has often been studied in theoretical cosmology, and as the latest study shows, this can help us solve problems with the cosmological constant.
The Hubble constant is a measure of the expansion rate of our universe. This expansion was first demonstrated by Edwin Hubble using data from Henrietta Leavitt, Westo Slifer and others.
Over the next few decades, measurements of this expansion stopped at around 70 (km/sec)/Pk. Astronomers thought that as our measurements became accurate, the various methods would come to a common value, but this did not happen.
At this point, the observed values ​​of the Hubble constant are grouped into two groups. Measurements of fluctuations in the cosmic microwave background indicate a lower value of about 67 (km/s)/Pkc, while observations of objects such as distant supernovae give a higher value of about 73 (km/s)/Pkc.
Something is clearly not adding up, and theoretical physicists are trying to figure out why.
At this point, the idea of ​​a mirror universe arises, but such ideas, as a rule, lose popularity in theoretical physics. The idea of ​​a mirror universe is no exception.
It was explored a bit back in the 1990s as a way to solve the symmetry problem of matter and antimatter. We can create matter particles in the lab, but when we do that, we also create antimatter particles. They always come in pairs. So, when particles formed in the early universe, where did all their antimatter siblings go?
According to the hypothesis, the Universe formed as a pair: our universe of matter and a similar universe of antimatter. It seems that the problem is solved, but for various reasons, the idea has ceased to interest scientists. However, in the new study, it is already considered as a way to solve the problem of the Hubble constant.
The team found that when you tune the cosmological models to match observed expansion rates, several dimensionless parameters stay the same, suggesting an underlying cosmic symmetry.
If you consider this symmetry more broadly, then you can scale the speed of gravitational free fall and the speed of scattering of photons and electrons so that the various Hubble measurement methods agree better.
And if this invariance is real, it implies the existence of a mirror universe that will affect our universe through a weak gravitational pull.
It should be noted that this study is mainly a proof of concept. In it, scientists only make an assumption about how cosmic invariance can solve the problem of the Hubble constant.
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