Forgotten Particle Could Answer Mystery of Why We Exist, Say Physicists
- Physicists Rishav Roshan and Sudipta Show from the University of Southampton and the Indian Institute of Technology Kanpur published a paper in Physical Review Letters suggesting a decoupled heavy neutrino explains why matter dominates the universe.
- According to standard theories, the Big Bang should have produced equal amounts of matter and antimatter, causing annihilation. Yet the universe is predominantly made of matter, creating a fundamental puzzle for scientists.
- The decoupled heavy neutrino shifted the temperature in the early universe, acting as "a switch that shapes how the matter-antimatter imbalance was built up," with help from the Standard Model Higgs boson.
- As the cosmos cooled after the Big Bang, the particle lived long enough to temporarily dominate the universe's energy density, triggering a matter-dominated period that allowed stars, planets, and life to form.
- Upcoming gravitational wave detectors could test the hypothesis, Roshan and Show claim, potentially detecting "signatures related to heavy neutrinos and their role in the early universe, providing insights into the matter-antimatter asymmetry.
14 Articles
14 Articles
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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