According to a theory devised by some astronomers, huge black holes present at the centre of the galaxies in the universe produce gravitational waves , like in a place of large gathering, such as a restaurant.
An international group of scientists brought to light the presence of gravitational waves, the theory was originally put forward by Albert Einstein.
The report, which was put out on Thursday, stated that astrophysicists got to “hear” gravitational waves with low-frequency. It basically means changes in the structure of the universe which takes place due to large objects moving in different directions and coming into collision in the outer space.
Maura Mclaughlin, co-director of North American Nanohertz Observatory for Gravitational Waves or NANOGrav, the collaboration which reported the findings, said that ” It’s really the first time that we have evidence of just this large-scale motion of everything in the universe”.
The gravitational waves with low frequencies produce sounds of humming in the universe, which is heard in the entire space.
As per research, the space contains a lot of these waves which change their positions over a long period of time. They are produced from pairs of huge black holes which swirl and then combine for the purpose.
The discovery is being considered a significant one, it would open doors for further understanding of the universe.
According to the theory put forward by Albert Einstein, gravitational waves are ripples in the fabric of the universe that travel through everything at the speed of light almost entirely unimpeded. Their presence was substantiated in 2015 when observatories in the US and Italy detected gravitational waves formed by a pair of black holes which collided.
But these were waves with high frequency. Scientists on the contrary, were trying to look for waves with low frequency, which travelled through the entire space producing a sort of background noise.
Now, after years of putting effort into the work, they now have ample evidence with them which confirms the existence of these waves.
Einstein’s theory of gravitational waves of the universe has been confirmed
Albert Einstein was the one to propose the existence of gravitational waves, or ripples in space-time, in 1916 as an addition to his theory of general relativity. The theory considered gravity as the distortion of space and time, caused by matter.
The research conducted recently focused a lot on pulsars, which are very dense remnants of stars which had bursted and were spinning at extremely high speeds.
Jeff Hazboun, an astrophysicist from Oregon State University and lead author of one of the papers published in the Astrophysical Journal Letters, while speaking to Reuters, said that “Gravitational waves are generated by astronomically dense objects in our universe, typically in orbital motion around each other. As these waves travel through space, they physically stretch and compress the fabric of space-time itself”.
Gravitational waves produce sounds like hum
Scientists identified the gravitational waves’ background noise as being similar to the gathering of several people, where individual voices don’t vary.
Previously, research was conducted at the Laser Interferometer Gravitational-Wave Observatory (LIGO).
Hazboun further said ” The most straightforward explanation for these gravitational waves involves a collection of supermassive black hole pairs orbiting each other in our cosmic neighborhood. However, alternative explanations could involve intriguing new physics related to the early stages of the universe, near the Big Bang, approximately 13.8 billion years ago.”
There may be other sources of gravitational waves too
Though the formation of gravitational waves is being attributed to the combining of black holes, there may be other sources of their origin too.
Chiara Mingarelli, a scientist working with NANOGrav, said ” We found the choir, but we don’t know who’s singing in it — the pop stars are the supermassive black holes, they’re the ones that are the most obvious candidates, however, there are other potential sources of gravitational waves, like quantum fluctuations in the early universe that were driven to the size of the whole universe by inflation.”
Another source of the waves could be the cosmic strings which are remnants of the universe from its earliest form, it was fast to cool down due to which cracks appeared that float all over the space.