Robert Lea is a science journalist in the U.K. whose articles have been published in Physics World, New Scientist, Astronomy Magazine, All About Space, Newsweek and ZME Science. He also writes about science communication for Elsevier and the European Journal of Physics. Rob holds a bachelor of science degree in physics and astronomy from the U.K.
The rate of expansion of the universe is accelerating across the cosmos, driven by a mysterious force known as dark energy — but maybe not at the edges of black holes, new research suggests. Forbidden black holes and ancient stars hide in these 'tiny red dots'
Poplawski added that some people have suggested that black holes might be growing and increasing their mass without any matter accretion due to the expansion of the universe. He argued that his results show that this explanation of black hole growth, especially as it applies toGeneral relativity states that objects with mass cause the very fabric of space and time, united as a single entity called space-time, to"warp.
An image of Sagittarius A*, the supermassive black hole at the heart of the Milky Way, is actually an image of an"almost black hole.", the Hubble parameter, is constant and can be either positive or zero at the event horizons of black holes," Poplawski said."This must be the case, because if the rate of the expansion of the universe at an event horizon were not constant, the pressure and space-time curvature would be infinite.
, the result is greater than what is obtained when we look at distant Type Ia supernovas and stars that alternate in brightness called Now, Poplawski's hypothesis offers another way in which certain regions of the cosmos could be accelerating at different rates. "Strictly speaking, we cannot measure the Hubble parameter at the event horizon because as we see the black hole, the horizon hasn’t formed yet," Poplawski said."However, an observer falling into a black hole will cross the event horizon within a finite time and could theoretically measure the Hubble parameter while crossing it.
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