Dark matter represents a mystery for researchers, and although there are many theories out there, there is no clear answer. However, astronomers manage to rule out certain theories as time goes by. Recently, scientists proved that Stephen Hawking’s theory on the dark matter is not correct.
“Hawking, in his 1971 paper, mentioned these primordial black holes could make most of the dark matter, which is not visible (aka dark matter). Now, observations are proving this cannot be correct,” said Surhud More, senior IUCAA scientist and co-author of the paper.
Since around 85% continues to be a mystery for humans, it was believed that it is made up of dark matter. However, it was challenging to define said dark matter. This project began back in 2014, and gravitational lensing was used to bend light around massive objects. According to Anupreeta Moore, another co-author of the paper, microlensing was used as well.
Scientists ruled out Stephen Hawking’s theory on the dark matter
Multiple images of the same objects were formed if there was a high mass. However, if the mass wasn’t that high, the same model was seen, but brighter.
“Theoretically, dark matter surrounds galaxies, which means there is the dark matter between the Milky Way and Andromeda galaxies. If Hawking’s theory was true, the entire dark matter between Andromeda and us should be made up of primordial black holes. If primordial black holes in the mass range we considered formed all of the dark matter, we should have seen about 1,000 microlensing events, where the light coming from some stars would go up and down,” explained Surhud More.
“But, this didn’t happen, except perhaps once. That implies that while there is dark matter, there are not enough primordial black holes to explain it. At the most, 1% of the dark matter is made of such moon mass primordial black holes,” More added.