Time, what is it all about?

What theory of time do you accept and why?

Personally, I lean to the B theory of time or the moving spotlight theory. I think Presentism is bankrupt and debunked by mainstream science.

The theory of special relativity says time and space are interconnected. This supports the B theory, since there is no objective "now" in space. One part of space exists equally as another.

In quantum mechanics, they have observed effects happening before causes. This means the future must exist in order for the present to be affected by it. And the past must exist for the present to affect it.

http://www.popsci.com/science/article/2012-04/quantum-experiment-effect-happens-cause

Furthermore, they've shown entangled particles can be entangled through time as well as space. This completely destroys Presentism.

http://io9.com/5744143/particles-can-be-quantum-entangled-through-time-as-well-as-space

Also, using Modal logic, we may be able to debunk Presentism. I'm not sure about this one though.

Time travel must be possible. We have tons of TV shows demonstrating this. We can conceive of time travel, but under theories of time like Presentism time travel is not possible. Thus, theories of time which state only one or two states of time exist, must be false.

Anyway, what about you guys?

JV-Stalin: So first of all, I believe in a space-time continuum too. So therefore here is now, but somewhere else it is not now. It follows from this that presentism must be true if there was no space, and cannot be true if there is space. No quantum physics needed.

Time travel is possible. I've been doing it for quite a long time at close to 1 hour per hour. But I also believe only one series of states of time exists that we've ever observed, in that a state of time also means a state of space. Science can never prove whether another state is even possible so long as science is based on observation, not speculation. At any one time, there is only one space in science.

Time travel to the future is easy. Every human ever has done that. To the past is a different issue. We can get instant communication, possibly, with entangled particles, which is a weak form of time travel (teleportation would seem to me to be the coolest use of this technology if developed to that extent). The io9 article makes little sense by the way - space and time are interrelated, so if it's entangled in space of course it's entangled in time (though whether it's possible to entangle a particle across time, and how to do it, is a different question).

All this leads to a very troubling problem with time travel - we can't change time.

The popsci article showed we can know what will happen in time, but that doesn't mean we can change it. And personally, I don't believe we can except in extremely defined circumstances. It's a barrier much like the speed of light limits us in space, so too are we limited in time to moving within certain bounds of speed.

This is a interesting read