Although scientists have not seen black holes, they have deduced their existence. Things around a black hole suddenly begin moving faster as they come near the black hole. Black holes star in theoretical concepts like wormholes. These are tunnels that could enable quick movement through both time ...
Did these primordial black holes, or PBHs, ever exist? And if so, are they still around today? Theoretical astrophysics models of the Big Bang and the universe itself suggest that if a PBH had enough mass when it formed, it could still exist today. Roughly speaking, any PBHs less than...
A new study explores the concept of light-only black holes. Can you really form cosmic voids from pure light, or is it a lost cause?
Caltech's Kip Thorne, for example, described the firewall paradox as "a burning issue in theoretical physics." The very basis of this burning issue is the thing that makes black holes black — the event horizon. In its most basic form, the event horizon of a black hole is the point ...
“In Einstein’s gravity, the black-hole horizon is not so different from any other part of space,” says Polchinski. “We never see space-time fluctuate in our own neighbourhood: it is just too rare on large scales.”Raphael Bousso, a theoretical physicist at the University of California,...
whimsically, 'Information preservation and weather forecasting for black holes', and it has yet to pass peer review. The paper was based on a talk he gave via Skype at a meeting at the Kavli Institute for Theoretical Physics in Santa Barbara, California, in August 2013 (watch video of the...
To answer the question, astronomers have to turn to theoretical calculations to make estimates. In a recent study, researchers determined that there are potentially millions of yet-to-be-detected small black holes in our cosmic neighborhood. This means that about 1% of all the matter in the uni...
No. We have a substantial amount of evidence for the existence of black holes. But there's been no wormholes found. Are there different types of wormholes? There are different theoretical implementations of our theory of gravitation, called general relativity, that would describe wormholes with som...
stability has only been proved for slowly rotating black holes--where the ratio of the black hole's angular momentum to its mass is much less than 1. It has not yet been demonstrated that rapidly rotating black holes are also stable. In addition, the researchers did not determine precisely ...
term, that had both a positive and negative solution. Experiences like these make physicists very careful about throwing out solutions to equations, just because they’re “unreasonable”. In ...