New research suggests that dark matter, the universe’s most puzzling and mysterious substance, may not exist. But removing dark matter from our cosmological models could hinge on the possibility that gravity behaves differently on very large scales, one scientist says.
Dark matter has been a thorn in the side of physicists because, despite outweighing ordinary matter by a ratio of 5 to 1, it remains effectively invisible. That’s because it doesn’t interact with light, or more technically, electromagnetic radiation. Because the particles that comprise the atoms that make up stars, planets, moons, living things, and everything we see around us, do interact with light, scientists have been searching for particles that could make up dark matter. However, this addition to particle physics, which has thus far eluded all attempts to uncover it, isn’t needed if we are wrong about how gravity behaves on galactic scales. At least, that is what Naman Kumar of the Indian Institute of Technology suggests.
“The mystery of dark matter — unseen, pervasive, and essential in standard cosmology — has loomed over physics for decades,” Kumar wrote for Phys.org. “In new research, I explore a different possibility: Rather than postulating new particles, I propose that perhaps gravity itself behaves differently on the largest scales.”
Key Points:
- Dark matter outweighs ordinary matter 5 to 1 but remains undetected
- No dark matter particles have been discovered despite decades of searching
- New theory proposes gravity may behave differently on galactic scales
- This could eliminate the need for dark matter particles entirely
- Research challenges fundamental assumptions in cosmology
This alternative approach invites physicists to reconsider whether the gravitational effects we attribute to dark matter might actually stem from modified gravitational behavior at cosmic scales, rather than from invisible matter particles.
