Cosmologists need gravity wave measurements from 50 binary neutron star mergers to find out how quickly our universe really expands, according to new research.
Cosmos has been ballooning ever since it was born from the Big Bang about 13.8 billion years ago. Edwin Hubble, an American astronomer, discovered that galaxies farther from our own Milky Way moved faster, a sign that the universe was growing.
The expansion rate, known as Hubble's constant, is apparently anything but constant. When scientists try to calculate it by analyzing the cosmic background radiation or by studying stars and supernovae, they get different answers. Now, an international team of physicists believe that the conflict can be solved by examining a new data source: Gravitational waves from neutron stars smash into each other.
"We have calculated that by observing 50 binary neutron stars over the next decade, we will have sufficient gravitational wave data to independently determine the best measurement of the Hubble constant," said Stephen Feeney, lead author of the paper that became published in Physical Review Letters and a researcher at Flatiron Institute, USA.
"We should be able to detect enough mergers to answer this question within five to ten years."
Although gravity waves were predicted more than a century ago by Albert Einstein, they were first observed in 201
GRAV WAVE TSUNAMI boffinry BONANZA – the afterglow of the th e universe big bang The Virgo Observatory has been upgraded to be more sensitive to detecting less gravitational waves. The first neutron star collision was detected in 2017, although it has not been enough for cosmologists to begin crushing numbers to compile Hubble's constant.
As two neutron stars crash into each other, a portion of the resulting energy is converted into gravity waves that curl throughout. They give talented signs of the star's mass and distance and allow researchers to figure out how quickly they both traveled in space to educate Hubbles constantly.
"This will in turn lead to the most accurate picture of how the universe expands and helps us improve the standard cosmological model," said Hiranya Peiris, co-author of the paper and a physics and astronomy professor at University College London. ®