Insights Blog
-- Browse All Articles --
Physics Articles
Physics Tutorials
Physics Guides
Physics FAQ
Math Articles
Math Tutorials
Math Guides
Math FAQ
Education Articles
Education Guides
Bio/Chem Articles
Technology Guides
Computer Science Tutorials
Forums
Classical Physics
Quantum Physics
Quantum Interpretations
Special and General Relativity
Atomic and Condensed Matter
Nuclear and Particle Physics
Beyond the Standard Model
Cosmology
Astronomy and Astrophysics
Other Physics Topics
Trending
Featured Threads
Log in
Register
What's new
Search
Search
Search titles only
By:
Classical Physics
Quantum Physics
Quantum Interpretations
Special and General Relativity
Atomic and Condensed Matter
Nuclear and Particle Physics
Beyond the Standard Model
Cosmology
Astronomy and Astrophysics
Other Physics Topics
Menu
Log in
Register
Navigation
More options
Contact us
Close Menu
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Forums
Physics
High Energy, Nuclear, Particle Physics
Creation of matter in the big bang
Reply to thread
Message
[QUOTE="PeterDonis, post: 6061005, member: 197831"] I don't think "creation" is correct here. The website says "in the beginning, there was not yet any matter". I don't think that's correct; from what I understand, all of the Standard Model fields had a lot of energy pumped into them in the "reheating" event at the end of inflation. So there would have been electrons and positrons, quarks and antiquarks, etc. as well as photons. From what I understand, the reason pair production reactions are important in the early universe is that, without them, all of the electron-positron, quark-antiquark, etc. pairs that were formed in the "reheating" event at the end of inflation would have annihilated each other almost immediately thereafter, so that there would only have been the tiny excess of matter over antimatter that we now have almost from the start of the Big Bang (i.e., the end of inflation). Pair production reactions at the high temperature of the early universe kept [I]re-forming[/I] electron-positron, quark-antiquark, etc. pairs as fast as they were annihilated; not until the temperature fell below the threshold temperature for pair production did all of the pairs of particular types (electron-positron, quark-antiquark, etc.) annihilate each other for good, leaving only the tiny excess of matter over antimatter that we have now. (Each of the types has a different threshold temperature because of its different rest mass, so these final annihilation events happened at different times in the early universe.) [/QUOTE]
Insert quotes…
Post reply
Forums
Physics
High Energy, Nuclear, Particle Physics
Creation of matter in the big bang
Back
Top