Forgotten Particle Could Answer Mystery of Why We Exist, Say Physicists
The model says a long-overlooked heavy neutrino could briefly dominate early cosmic energy and help create the tiny matter excess needed for today’s universe.
- Physicists from the University of Southampton and the Indian Institute of Technology Kanpur proposed a new model in Physical Review Letters suggesting a 'decoupled' heavy neutrino explains why matter triumphed over antimatter after the Big Bang.
- Standard theory predicts equal amounts of matter and antimatter, yet the universe is predominantly matter. Scientists previously ignored the third 'decoupled' heavy neutrino, assuming its weak interactions made it irrelevant.
- Rishav Roshan and Sudipta Show's model indicates this particle lived long enough to briefly dominate cosmic energy density. This shift altered early expansion, tipping the balance in favor of matter.
- These theoretical findings suggest the process left detectable imprints on primordial gravitational waves. Upcoming experiments could test these signatures, providing insights into matter-antimatter asymmetry.
- While the model offers a new explanation for cosmic matter dominance, the researchers acknowledge this particle remains hypothetical. No heavy partner particle has been detected, and findings rest on theoretical calculations rather than observational data.
15 Articles
15 Articles
A Particle Long Cosidered an "Irrelevant Background Detail in Particle Physics" Could Now Help Solve the Mystery of Why We Exist
A hypothetical heavy neutrino may have altered conditions in the early universe, offering clues to the mystery of how and why we exist.
Scientists Discover A Strange Particle Explains the Origin of Reality
Why is the universe the way it is? A long-overlooked particle might have given matter an edge over antimatter in the split-seconds after the Big Bang, which researchers say “could transform our understanding of cosmic evolution and the fundamental laws of physics.”
Image of the Crab Nebula, formed after the explosion of a star. Study investigates how particles of the primordial Universe may have influenced the imbalance between matter and antimatter. NASA/ESA/J. DePasquale (STScI) A particle practically ignored for decades can help explain one of the greatest mysteries of physics: why there is enough matter in the Universe to form stars, planets and even ourselves. The hypothesis appears in a study publish…
British and Indian scientists discover in 'Physical Review Letters' how the primitive cosmos avoided cosmic annihilation into pure energy.
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