A hypothetical particle could have briefly held more energy than everything else in the infant universe combined.

A heavy neutrino that physicists wrote off as irrelevant may be the missing piece in an old puzzle. Rishav Roshan of the University of Southampton and Sudipta Show of the Indian Institute of ...

A mysterious particle overlooked for decades may hold the key to why matter survived the Big Bang, allowing stars, planets, ...

Add Yahoo as a preferred source to see more of our stories on Google. A neglected "ghost particle" may have dominated the universe right after the Big Bang ‪—‬ changing how the cosmos expanded in its ...