Black holes are the key predictions of the general theory of relativity,
Black holes are a key prediction of the general theory of relativity,” said Queen Mary Emeritus Professor Bernard Carr and colleagues.
“There are a plethora of observations indicating their existence within the solar or intermediate-mass range. especially, the existence of binary black holes within the mass range between 10 and 50 solar masses has been demonstrated by the detection of gravitational waves from inspiralling binaries.”
“There is additional evidence for supermassive black holes at the centers of galaxies, including Sagittarius A* at the middle of our own Milky Way Galaxy, with a mass of 4 million solar masses.”
“Recently, the imaging of the shadow created by M87*, the supermassive region at the middle of the enormous elliptical galaxy M87 with a mass of 6.5 billion solar masses, has been reported by the Event Horizon Telescope.”
“The supermassive black holes in galactic nuclei span an enormous mass range, extending up to just about 100 billion solar masses,” they said.
“The current heaviest region is related to the quasar TON 618 and features a mass of 70 billion solar masses, while the second heaviest, at the middle of the galaxy IC 1101, features a mass inferred from its radio wave of 40 billion solar masses.”
“This raises the difficulty of whether there might be even larger region s in galactic nuclei and whether indeed there’s any natural upper limit to the mass of a supermassive black hole.”
In their new paper, Professor Carr, Dr. Florian Kühnel from the Ludwig-Maximilians-Universitat, and Dr. Luca Visinelli from the University of Amsterdam suggest that stupendously large black holes (SLABs) might be primordial, forming within the early Universe, and well before galaxies.
As primordial black holes don’t form from a collapsing star, they might have a good range of masses, including very small and stupendously large ones.
“Whilst there isn’t currently evidence for the existence of SLABs, it’s conceivable that they might exist and that they may additionally reside outside galaxies in the region, with interesting observational consequences,” Professor Carr said.
“However, surprisingly, the thought of SLABs has largely been neglected so far .”
“We’ve proposed options for a way these black holes might form, and hope that our work will begin to motivate discussions amongst the community.”
If SLABs are of primordial origin, this raises a stimulating link with the suggestion that primordial black holes could provide the substance .
Although SLABs themselves clearly cannot do that, since they’re overlarge to reside in galactic halos, it’s possible that primordial black holes provide the substance during a much lower mass range.
“SLABs themselves couldn’t provide the substance ,” Professor Carr said.
“But if they exist in the least , it might have important implications for the first Universe and would make it plausible that lighter primordial black holes might do so.”