Could matter-anti-matter repulsion power the expansion of the universe?
If matter and anti-matter were created in roughly equal proportions at BB, and their subsequent annihilation did NOT occur, perhaps if the left hemisphere was matter and the right hemisphere were anti-matter, would not the repulsive gravity of the two perhaps power the accelerating status of our "matter universe"? Matched by an equal condition on the anti- side?
No, because there is no repulsive gravity between matter and anti-matter. Anti-matter particles are basically the same as their corresponding matter particles, but they have opposite charge. They still attract each other gravitationally.
But even if matter and anti-matter did repel each other, your scenario still wouldn't work, given the way the universe is expanding. The universe expands such that every point in space is expanding away from every other point in space. Galaxy A is moving away from Galaxy B and Galaxy C, and Galaxy B and Galaxy C are also moving away from each other. If you had two flavors of matter (matter and anti-matter), and they repelled each other, but attracted themselves, then this wouldn't work. It doesn't explain the expansion of the universe as we actually see it.
Get More 'Curious?' with Our New PODCAST:
- Podcast? Subscribe? Tell me about the Ask an Astronomer Podcast
- Subscribe to our Podcast | Listen to our current Episode
- Cool! But I can't now. Send me a quick reminder now for later.
How to ask a question:
If you have a follow-up question concerning the above subject, submit it here. If you have a question about another area of astronomy, find the topic you're interested in from the archive on our site menu, or go here for help.Table 'curious.Referrers' doesn't existTable 'curious.Referrers' doesn't exist
This page has been accessed 15801 times since May 1, 2003.
Last modified: February 1, 2007 1:29:32 PM
Ask an Astronomer is hosted by the Astronomy Department at Cornell University and is produced with PHP and MySQL.
Warning: Your browser is misbehaving! This page might look ugly. (Details)