image:Movie clip showing the gravitational lensing effects caused by no object in an observers line of sight, a black hole, and the topological soliton. view more
Credit: CREDIT: Pierre Heidmann/Johns Hopkins University.
It looks like a black hole and bends light like a black hole, but it could actually be a new type of star.
Though the mysterious object is a hypothetical mathematical construction, new simulations by Johns Hopkins researchers suggest there could be other celestial bodiesin space hiding from even the best telescopes on Earth. The findings are set to publish inPhysical Review D.
We were very surprised, said Pierre Heidmann, a Johns Hopkins University physicist who led the study. The object looks identical to a black hole, but theres light coming out from its dark spot.
The detection of gravitational waves in 2015 rocked the world of astrophysics because it confirmed the existence of black holes. Inspired by those findings, the Johns Hopkins team set out to explore the possibility of other objects that could produce similar gravitational effects but that could be passing as black holes when observed with ultraprecise sensors on Earth, said co-author and Johns Hopkins physicistIbrahima Bah.
How would you tell when you don't have a black hole? We don't have a good way to test that, Bah said. Studying hypothetical objects like topological solitons will help us figure that out as well.
The new simulations realistically depict an object the Johns Hopkins team calls a topological soliton. The simulations show an object looking like a blurry photo of a black hole from afar but like something else entirely up close.
The object is hypothetical at this stage. But the fact that the team could construct it using mathematical equations and show what it looks like with simulations suggests there could be other types of celestial bodies in space hiding from even the best telescopes on Earth.
The findings show how the topological soliton distorts space exactly as a black hole doesbut behaves unlike a black hole as it scrambles and releases weak light rays that would not escape the strong gravitational force of a true hole.
Light is strongly bent, but instead of being absorbed like it would in a black hole, it scatters in funky motions until at one point it comes back to you in a chaotic manner, Heidmann said. You dont see a dark spot. You see a lot of blur, which means light is orbiting like crazy around this weird object.
A black holes gravitational field is so intense that light can orbit around it at a certain distance from its center, in the same way that Earth orbits the sun. This distance determines the edge of the holes shadow, so that any incoming light will fatally hit the region that scientists call the event horizon. There, nothing can escapenot even light.
The Hopkins team simulated several scenarios using pictures of outer space as if they had been captured with a camera, placing a black hole and the topological soliton in front of the lens. The results produced distorted pictures because of the gravitational effects of the massive bodies.
These are the first simulations of astrophysically relevant string theory objects, since we can actually characterize the differences between a topological soliton and a black hole as if an observer was seeing them in the sky, Heidmann said.
Motivated by various results from string theory, Bah and Heidmann discovered ways to construct topological solitons using Einsteins theory of general relativity in 2021. While the solitons are not predictions of new objects, they serve as the best models of what new quantum gravity objects could look like compared to black holes.
Scientistshave previously created models of boson stars, gravastars, and other hypothetical objects that could exert similar gravitational effects with exotic forms of matter. But the new research accounts for pillar theories of the inner workings of the universe that other models dont. It uses string theory that reconciles quantum mechanics and Einsteins theory of gravity, the researchers said.
Its the start of a wonderful research program, Bah said. We hope in the future to be able to genuinely propose new types of ultracompact stars consisting of new kinds of matter from quantum gravity.
The team includes Johns Hopkins physicist Emanuele Berti. Thetopological soliton in the simulations was first constructed in research published in 2022 by Bahs group.
Physical Review D
Computational simulation/modeling
Not applicable
Imaging topological solitons: The microstructure behind the shadow
25-Apr-2023
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Could this copycat black hole be a new type of star? - EurekAlert
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