# Universe : Can time move backward (New theory special)

So, Hey Guys,
I was watching DNews and Suddenly I came across this video. Also I found two sources of 'thoery'
Source A ;
Source B;
Seems like they are saying Entropy isn't the factor Explaining time, They even said that Thermodynamics (and it's second law) isn't what explains the time, They believe that "GRAVITY" controls time......
They tested out using computer simulation which created 2 Universes (of Newtonian physics) and the arrow of time was opposite in both the universe!
But time is relative right? that means that to them its foward right?
I'll argue that they are incorrect because it will make physics even more complex, I mean some theory's cant be explained by this... (hope i make sense there :P)

Doug Huffman
Gold Member
Cause and effect are the arrow of time.

Here's the arXiv version: http://arxiv.org/abs/1409.0917

Julian Barbour, Tim Koslowski, Flavio Mercati

It is widely believed that special initial conditions must be imposed on any time-symmetric law if its solutions are to exhibit behavior of any kind that defines an arrow of time'. We show that this is not so. The simplest non-trivial time-symmetric law that can be used to model a dynamically closed universe is the Newtonian N-body problem with vanishing total energy and angular momentum. Because of special properties of this system (likely to be shared by any law of the Universe), its typical solutions all divide at a uniquely defined point into two halves. In each a well-defined measure of shape complexity fluctuates but grows irreversibly between rising bounds from that point. Structures that store dynamical information are created as the complexity grows and act as records'. Each solution can be viewed as having a single past and two distinct futures emerging from it. Any internal observer must be in one half of the solution and will only be aware of the records of one branch and deduce a unique past and future direction from inspection of the available records.

I really didn't get this... :(
See. #2 Cause and effect are the arrow of time.

Look at figure 6. time-independent (autonomous) Hamiltonian [6]: http://arxiv.org/abs/1409.0917

.... it is very natural to identify an arrow of time with the direction in which structure, measured in our case by CS, grows. We then have a dynamically-enforced scenario with one past (the minimum of CS, which occurs near τ = 0) and two futures.The growth-of-complexity arrow always points away from the unique past. In the atypical solutions that terminate with Icm = 0 (footnote 3) there is one past and only one future.

"time is an abstraction at which we arrive through the changes of things.” Thus, time as such does not exist but only change. Much of my research has been devoted to the implications of this insight. I have shown how, alongside the relativity of motion, the notion of time as change can be built into the foundations of dynamics. In fact, this idea is contained in a hidden form within general relativity. Its potential consequences for the yet to be found quantum mechanics of the universe are profound. The quantum universe is likely to be static. Motion and the apparent passage of time may be nothing but very well founded illusions."