The Collapsing Empire by John Scalzi
Our entire universe is in the hands of the Physics and faster than the light travels. The Flow is the extra-dimensional field that can access at the certain points in space-time. This can flow or transport us to the other world and the around the stars.
Flow is also eternal. As the river changes, the flow also changes. This will cut down the whole of the world from the rest of the humanity. Interdependency is the ethos that specifies that no human outpost can survive without the others.