After the New Year I sent this letter to NASA:
So, I just read this blog post:
Which took me to this blog post:
They describe this paradox:
“What’s more, there is an energy associated with any given volume of the universe. If that volume increases, the inescapable conclusion is that this energy must increase as well. And yet physicists generally think that energy creation is forbidden.”
Here’s my Question: Why does increased VOLUME necessarily mean increased ENERGY when that VOLUME is a vacuum. Can’t the energy and matter just be spreading across the universe through a vacuum without altering total ENERGY? Like marbles across a floor?
A few weeks later NASA replied thus:
The answer is that it is the energy density that is constant, so as the volume increases, there must be more energy. The constant energy density seems to be an observed feature of the Universe – that is, it is needed to explain the observed expansion in a simple way compatible with General Relativity. Here is a more detailed explanation:
You might also enjoy reading a related post:
Here is a good site for anyone interested in astronomy:
Brian and Jeff
for Ask an Astrophysicist
Editorial. I’m still unsure what’s going on. I need to find me an astrophysicist in the flesh.