Dark Energy

[JohnC]

Is there evidence to rule out the possibility that dark energy is not a positive force inside our universe, but rather caused by a negative force created by a perfect vacuum outside? I understand there is no such thing as a perfect vacuum inside our universe, manmade or otherwise. But, if there were a perfect vacuum outside, I can imagine it would be like a balloon expanding, finding itself suddenly on the Moon. If we were inside this balloon, might we wonder just what positive force was pushing on the sides of the balloon, rather than a force pulling from outside? Does the math rule this out? I'm ignorant.

 

Edited May 19, 2014 by JohnC

[Mordred]

good idea however measurements rule it out. If you had an influence of pressure, as you say outside our universe then the motion of galaxies would be moving outward. In other words have a preferred direction. Our universe does not have a preferred direction or location. Now there is also no outside our universe. Unless you count the observable universe only. We do not know if our universe is finite or infinite. Here is some articles I would like you to especially read the balloon analogy

 

here is two terms to remember in cosmology

Homogeneous- no preferred location ie a center

Isotropic - no preferred direction

 

expansion measurements follow these rules galaxies move apart from each other equally in all directions, and the angles between any 3 galaxies do not change

 

http://www.phinds.com/balloonanalogy/ : A thorough write up on the balloon analogy used to describe expansion
http://tangentspace.info/docs/horizon.pdf :Inflation and the Cosmological Horizon by Brian Powell
http://arxiv.org/abs/1304.4446 :"What we have leaned from Observational Cosmology." -A handy write up on observational cosmology in accordance with the LambdaCDM model.
http://arxiv.org/abs/astro-ph/0310808 :"Expanding Confusion: common misconceptions of cosmological horizons and the superluminal expansion of the

Edited May 19, 2014 by Mordred