- #1
windy miller
- 303
- 25
I have read that conservation of energy is not a meaningful concept in an expanding universe cosmology. See here
http://www.preposterousuniverse.com/blog/2010/02/22/energy-is-not-conserved/
However I have also heard the if the net energy os the universe is zero then it can have a vacuum genesis without it violating energy conservation because the positive mass energy might be canceled out by the negative gravitational energy. See
https://en.wikipedia.org/wiki/Vacuum_genesis
My question is, if energy isn't conserved in cosmology then why do cosmologists care about the energies cancelling out for a vacuum genesis model to work?
http://www.preposterousuniverse.com/blog/2010/02/22/energy-is-not-conserved/
However I have also heard the if the net energy os the universe is zero then it can have a vacuum genesis without it violating energy conservation because the positive mass energy might be canceled out by the negative gravitational energy. See
https://en.wikipedia.org/wiki/Vacuum_genesis
My question is, if energy isn't conserved in cosmology then why do cosmologists care about the energies cancelling out for a vacuum genesis model to work?