Many generations of scientists were confident that the laws of physics were absolutely symmetrical. Symmetry itself is
Astronomers from the University of Florida foundthe first evidence of the necessary breaking of symmetry at the moment of creation. They discovered that the Universe at some point preferred one set of shapes to their mirror images - a violation of symmetry occurred. According to this concept, there was a very short time in the history of our Universe when the laws of physics were very different than they are today, and this had enormous consequences for the evolution of the Universe.
As a result, scientists made two main conclusions:First, this parity violation could only affect future galaxies during a period of extreme inflation in the earliest moments of the universe, confirming a central component of the Big Bang theory of the origins of the cosmos.
Secondly, parity violation is alsowould help answer perhaps the most important question in cosmology: why anything exists at all. This is because parity violation is required to explain why there is more matter than antimatter. This is an important condition for galaxies, stars, planets and life to form the way they do.
“I have always been interested in big questionsabout the Universe. What is the beginning of the Universe? What are the rules by which it develops? Why is there something and not nothing? This work addresses these important questions,” explains Zachary Slepian, a professor of astronomy at the University of Florida who led the new study.
The idea behind parity symmetry is that the equationsphysicists are invariant under mirror inversion. This leads to the prediction that the mirror image of a reaction (such as a chemical reaction or radioactive decay) occurs in the same way as the reaction itself. Scientists commonly use the term handedness to describe this trait. Our left and right hands are mirror images of each other (conditionally). It is impossible to rotate the left hand in three dimensions to make it look like the right, which means that they can always be told apart.
Breaking symmetry would mean thatThe Universe prefers either a "left-handed" or a "right-handed" shape. To understand handedness, or the side the Universe has chosen, scientists imagined all possible combinations of four galaxies connected by imaginary lines in space. They created a three-dimensional object—a tetrahedron similar to a curved pyramid—the simplest shape that has a mirror image. They identified right-handed and left-handed galactic tetrahedra based on how the galaxies were related to their closest and farthest “partners” in these imaginary shapes.
To do this, scientists needed to analyzetrillions of imaginary tetrahedrons for each of the millions of galaxies that's a huge number of combinations. “Eventually we realized that we needed new mathematics,” the scientists write.
So they developed complex mathematicalformulas that made it possible to perform huge calculations in a reasonable time. This still required a lot of computing power. For this, scientists used the HiPerGator supercomputer.
Due to technical aspects of analysis it is difficultsay whether the Universe “chooses” “right-handed” or “left-handed” shapes, but scientists have observed clear evidence that the cosmos does have preferences. The reliability of the findings was seven sigma. In physics, a result with a sigma value of five or higher is usually considered reliable because the probability of a random result at this level is too small.
Although scientists are confident in this signal of violationparity, it remains possible that uncertainty in the underlying measurements could explain the asymmetry. Fortunately, much larger samples of galaxies from next-generation telescopes may provide enough data to resolve these uncertainties in just a few years. Scientists plan to analyze this new, more reliable data as part of the Dark Energy Spectroscopic Instrument telescope team.
In a symmetrical Universe, the Big Bang would havecreate equal amounts of matter and antimatter, which would destroy each other and leave the cosmos without stars and planets. Since we clearly exist in the Universe, physicists have long looked for some signs of asymmetry in early creation.
Scientists' findings cannot yet explain howwe found ourselves with such a critical abundance of matter. The “how” will require new physics beyond the Standard Model, which explains our Universe. But new results strongly suggest that there was an asymmetry in the earliest moments of the Big Bang.
Now the race begins for scientists to create a theory that can explain the preference for mirror images of the Universe and the excess of matter.
The results of the study were published in two articles (first, second).
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Cover illustration: MaxPixel's contributors| Source: https://www.maxpixel.net/photo-5944353