Mirror Universe?

[Taylirious]

Star Trek popularized the idea but could it be for real?

http://www.blastr.com/2014-12-12/sc...ted-mirror-universe-where-time-flows-backward

Scientists think the Big Bang could've created a mirror universe where time flows backward

[yt]https://www.youtube.com/watch?v=-XyU0qmuLME[/yt]

Does Our Universe Have A Mirrored Twin?

Most articles are from 2014, has there been any new news?

Do we have a backwards self?

 

[Nebusj]

It's difficult to imagine a way in which we could show there was one. If we could interact with it in some way, it would hardly be another universe, would it? I also admit a more personal skepticism that we could perceive a reverse-time universe as such.

 

[Asbo Zaprudder]

So, is this where the missing antimatter went at the Big Bang? A convention of Feynman diagrams is to label antiparticles with a time arrow pointing in the opposite direction to matter. I've always wondered if we would observe Entropy decreasing for a sufficiently large collection of antimatter. I assume that this mirror antimatter universe would occupy the same spatial dimensions but in the negative time direction, so we couldn't observe it directly. Also, I guess it wouldn't preclude all of the other parallel Universe options, which themselves might have antimatter twins.

 

[intrinsical]

I managed to find the original research paper. From what I could gather just reading its abstract, the physicists were only exploring the possibility that time is symmetric. They made a simulation where time is simply assumed to be symmetrical. And the simulation showed that a toy universe with this assumption was feasible and stable.

Journalists, as usual, exaggerated and twisted it into "Big Bang could create a mirror universe!". As if a toy simulation of 1000 particles is equivalent to the big bang.

 

[Asbo Zaprudder]

A better summary is here:

http://physics.aps.org/articles/v7/111