After the Big Bang, bubbles formed in the early universe, causing
Previously, physicists believed that the phase transitionoccurred in the early universe shortly after the Big Bang. A phase transition is a change in the shape and properties of a substance if its temperature changes. In a young and rapidly expanding universe, something similar probably happened as the plasma that filled space at the time cooled.
The phase transition in the early universe was unusual, causing gravitational waves, ripples in space-time.This usually happens when bodies of enormous mass, such as black holes and neutron stars, collide.
What's more, according to scientists at the University of Helsinki in Finland, the gravitational waves that occurred due to the phase transition were so powerful that they can be detected by the U.S. Laser Interferometer Space Antenna (LISA) mission.
In the new study, the scientists modeled how these gravitational waves could generate the signal that LISA would detect.
It is expected that LISA is a project of the Europeanspace agency (ESA) and NASA - will launch no earlier than 2037. According to the ESA, LISA will be the first mission dedicated to detecting gravitational waves, and it will be able to capture the small fluctuations in space-time that colliding black holes and supernovae create. If the mission detects the signals proposed in the study, it would be the first evidence that there were phase transitions in the early universe.
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