Time's Arrow: spacetime applies (General)

by David Turell , Sunday, October 02, 2016, 16:27 (2756 days ago) @ David Turell

A new book proposes that since space time is always expanding it is always making new time and since we live in spacetime, 'now' is at the edge of expansion:-https://www.sciencedaily.com/releases/2016/09/160921121234.htm-"Space is not the only thing expanding, Muller says; spacetime is expanding. And we are surfing the crest of that wave, what we call "now."-"'Every moment, the universe gets a little bigger, and there is a little more time, and it is this leading edge of time that we refer to as now," he writes. "The future does not yet exist … it is being created. Now is at the boundary, the shock front, the new time that is coming from nothing, the leading edge of time."-"Because the future doesn't yet exist, we can't travel into the future, he asserts. He argues, too, that going back in time is equally improbable, since to reverse time you would have to decrease, at least locally, the amount of space in the universe.-***-"a paper posted online June 25 that explains the theory in more detail -- using mathematics -- and proposes a way to test it using LIGO, an experiment that detects gravitational waves created by merging black holes.-"If Muller and Maguire are right, then when two black holes merge and create new space, they should also create new time, which would delay the gravitational wave signal LIGO observes from Earth.-"'The coalescing of two black holes creates millions of cubic miles of new space, which means a one-time creation of new time," Muller said.-***-"The dominant idea today for the direction of time came from Arthur Eddington, who helped validate Einstein's general theory of relativity. Eddington put forward the idea that time flows in the direction of increasing disorder in the universe, or entropy. Because the Second Law of Thermodynamics asserts that entropy can never decrease, time always increases.-"Entropy and time
 
"This idea has been the go-to explanation since. Even Stephen Hawking, in his book A Brief History of Time, doesn't address the issue of the flow of time, other than to say that it's "self-evident" that increasing time comes from increasing entropy.
Muller argues, however, that it is not self-evident: it is just wrong. Life and everything we do on Earth, whether building houses or making teacups, involves decreasing the local entropy, even though the total entropy of the universe increases. "We are constantly discarding excess entropy like garbage, throwing it off to infinity in the form of heat radiation," Muller says. "The entropy of the universe does indeed go up, but the local entropy, the entropy of the Earth and life and civilization, is constantly decreasing." (my bold)-"'During my first big experiment, the measurement of the cosmic microwave radiation, I realized there is 10 million times more entropy in that radiation than there is in all of the mass of the universe, and it's not changing with time. Yet time is progressing," he said. "The idea that the arrow of time is set by entropy does not make any predictions, it is simply a statement of a correlation. And to claim it is causation makes no sense.'"-Comment: Note my bold about entropy. Good explanation. This theory says Sean Carroll is wrong.