Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Whr did the elecrons come from?

  1. Mar 1, 2007 #1
    when we talk abt BBN, we only talk abt the nucleons. whr did th electrons come from? was it just beta decay or something else?
  2. jcsd
  3. Mar 1, 2007 #2


    User Avatar
    Science Advisor

    Actually nucleons did not form during big-bang nucleosynthesis. The big-bang nucleosynthesis fuses them into light elements, fixing relative abundances of the elements. The nucleons formed previously in a period or process called baryogenesis. For electrons, the corresponding process is called leptogenesis.
  4. Apr 16, 2007 #3
    At what time frame do photon's appear in the current Big Bang Theory?
  5. Apr 16, 2007 #4


    User Avatar
    Science Advisor

    At the very beginning.
  6. Apr 16, 2007 #5
    'Leptogenesis'. That's such a beautiful word! Now to casually drop that into a conversation when buying milk.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook