The team, publishing in the Journal of Cosmology and Astroparticle Physics, suggests that under certain conditions, dark matter could accumulate inside young brown dwarfs-objects too small to ignite typical stellar fusion. When the dark matter particles collide and annihilate, they release energy, preventing the dwarf from cooling and effectively giving birth to a stable, long-lived dark dwarf.
Unlike typical brown dwarfs, which fade over time, these exotic versions could glow indefinitely if situated in dense dark matter regions like the galactic core. The key lies in a type of dark matter particle called WIMPs-Weakly Interacting Massive Particles-which, though rare and elusive, could provide the necessary energy when trapped and annihilated within such stellar remnants.
To differentiate dark dwarfs from conventional brown dwarfs, scientists are looking to lithium. Ordinary brown dwarfs burn off their lithium-7 quickly, but dark dwarfs may retain it. Detecting lithium-7 in an otherwise brown dwarf-like object could signal a dark dwarf candidate.
Dr. Djuna Croon of Durham University, a co-author of the study, stated, "The discovery of dark dwarfs in the galactic centre would give us a unique insight into the particle nature of dark matter."
The researchers suggest current instruments, such as the James Webb Space Telescope, might already be capable of spotting these objects. Large-scale surveys could also identify candidates statistically, offering another path to verification.
Confirming even a single dark dwarf would mark a significant milestone in understanding the fundamental composition of the universe.
Research Report:Dark Dwarfs: Dark Matter-Powered Sub-Stellar Objects Awaiting Discovery at the Galactic Center
Related Links
Durham University
Stellar Chemistry, The Universe And All Within It
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