The model describes how the universe expanded from an extremely high density and high temperature initial state. Detailed measurements of the rate of expansion of the universe show that the event happened around 13.8 billion years ago, which is considered the age of the universe.
Immediately after the Big Bang, cosmic inflation transformed energy into matter and physicists assumed that inflation created the same amount of matter and antimatter, which destroyed each other on contact.
Then, however, something happened in favor of matter, allowing everything we see and touch today to exist – and a new study shows an explanation hidden in the ripples. very small in space-time.
“If you just start with an equal amount of matter and antimatter, you get nothing,”; said Jeff Dror, a postdoctoral researcher at the University of California.
The answer can surround particles called neutrinos, which have no electrical charge and can therefore act as matter or antimatter.
The theory is that about a million years after the Big Bang, the universe cools and undergoes phase transition, an event similar to how water boils down to a liquid into a gas.
According to research published in the journal Physical Review Letters, this change prompted decaying neutrinos to produce more matter than antimatter in “small, small” amounts.
Dr. Dror added: “There is no very simple – or almost any way – to probe [this theory] and understand if it really happened in the early universe. “
But Dr. Dror and his team have found a way that we can see this phase shift in action today, and thus come up with more hypotheses.
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When the team modeled this hypothetical phase transition under the different temperature conditions that might occur during this phase transition, they made an encouraging discovery.
They found that in any case, cosmic sequences would produce gravitational waves that would be detected by future observatories, such as the Space Agency’s Laser Interferometer Space Antenna. European Headquarters (LISA).
Tanmay Vachaspati, a theoretical physicist at Arizona State University who was not involved in the study, told Live Science in May: “If these chains are produced at a sufficiently high energy scale, they will actually Gravitational waves can be detected by planned observatories. ”