Astronomers propose the existence of "dark dwarfs" - objects powered by energy from dark matter particles that can shine forever. Their discovery could shed light on one of the universe's greatest mysteries.
Scientists may have discovered a completely new type of cosmic object that could provide vital clues about one of the universe's greatest mysteries: dark matter.
British and American astrophysicists have proposed the existence of unusual star-like objects called "dark dwarfs," which may be glowing faintly near the center of the Milky Way.
Despite the name, these objects do not appear dark, but are believed to be powered by dark matter (the invisible matter that is believed to make up about a quarter of the universe).
Brown dwarf Christians
Using theoretical models, scientists suggest that dark matter can become trapped inside young stars, creating enough energy to prevent them from cooling. This process could transform them into long-lived, stable objects called dark dwarfs.
These exotic stars are thought to form from brown dwarfs, which are sometimes described as "failed stars" because they lack the mass needed to sustain the nuclear fusion that powers most stars. Typically, brown dwarfs gradually cool and fade away over time.
But if a brown dwarf happens to be in a dense region of dark matter, like near the center of the Milky Way, it can trap dark matter particles. When these particles collide and annihilate each other, they release bursts of energy that cause the brown dwarf to glow—potentially forever.
The role of theWIMP's
The existence of these objects depends on the fact that dark matter is composed of special types of particles called WIMPs (weakly interacting massive particles).
These are heavy particles that barely interact with ordinary matter, but can annihilate each other inside stars, providing the energy needed to keep a dark dwarf alive.
To distinguish dark dwarfs from other objects with a weak glow like brown dwarfs, scientists point to a unique clue: lithium.
Researchers believe that dark dwarfs will still contain a rare form of lithium called lithium-7.
In normal stars, lithium-7 burns up quickly. So if you find an object that looks like a brown dwarf but still has lithium-7, that's a strong indication that it's something else.
The research suggesting the existence of dark dwarfs is based on a combination of theoretical models and potential observations from advanced telescopes. The central idea is that dark matter – the invisible component of the universe, which makes up about 85% of the total mass – is not just a “cosmic background”, but can directly influence the evolution of stars. While ordinary brown dwarfs are considered cold and fading objects, it is possible that near the center of the galaxy, where dark matter is concentrated in high density, brown dwarfs can become “dark dwarfs” by capturing WIMPs.
These particles are thought to collide and annihilate each other, creating an internal energy source that is independent of nuclear fusion. This means that instead of fading away, the dark dwarf could maintain a stable temperature and radiate radiation for billions of years – and perhaps forever.
If this scenario is correct, the discovery of dark dwarfs would not only expand our understanding of the types of stars in the universe, but would also provide direct evidence for the particle nature of dark matter. For physicists, this is a new experimental window into a field that has so far been studied mainly through theoretical means and accelerator experiments. In addition, precise measurements of lithium-7 in suspected dwarfs could serve as a clear indication to distinguish them from ordinary brown dwarfs.
The researchers emphasize that the James Webb Space Telescope, which has already proven its sensitivity in detecting distant galaxies and extremely faint objects, could be the tool to make this breakthrough. Focusing on the central region of the Milky Way, where the density of dark matter is particularly high, could provide the first opportunity to detect "alien" stars powered by dark matter.
The discovery of even one dark dwarf would be the first experimental proof that dark matter is capable of fueling stars, making this theory one of the most important discoveries in astrophysics of the 21st century.
A window into dark matter
Dr. Juna Kron, one of the authors of the study, said: "The discovery of dark dwarfs at the center of the galaxy will allow us a unique look into the particle nature of dark matter."
The team believes that telescopes like Webb can already detect dark dwarfs, especially when focused on the center of the galaxy.
Another approach is to look at many similar objects and statistically determine whether some of them could be dark dwarfs.
Finding just one of these dark dwarfs, the researchers say, would be a major step forward in revealing the true nature of dark matter.
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