Universe without beginnning or end

[GeneralDadmission]

Interested to hear what the review on these papers is here. Have just begun reading them so I don't have any questions as yet.

 

 

Cosmology from quantum potential

 

http://www.sciencedirect.com/science/article/pii/S0370269314009381

 

http://arxiv.org/abs/1404.3093v3

 

Dark Matter and Dark Energy from Bose-Einstein condensate

 

http://arxiv.org/abs/1411.0753

[Mordred]

Here is a decent coverage of it

 

https://medium.com/starts-with-a-bang/the-two-big-bangs-1493194f5cd9

 

 

https://plus.google.com/100479352836033641546/posts/3wW3fNH7GMV

Both articles cut through the pop media hype on Those papers

[GeneralDadmission]

cheers.

Here is a decent coverage of it

https://medium.com/starts-with-a-bang/the-two-big-bangs-1493194f5cd9


https://plus.google.com/100479352836033641546/posts/3wW3fNH7GMV
Both articles cut through the pop media hype on Those papers

 

The title of the thread was misleading if you thought I was looking for feedback on whether there was a BB. I am more interested in how a spacially finite univerese is modelled.

Edited February 11, 2015 by GeneralDadmission

[Mordred]

No prob mate, those are just good reviews on the cosmology from quantum potential paper.

[Strange]

Here is a decent coverage of it

 

https://medium.com/starts-with-a-bang/the-two-big-bangs-1493194f5cd9

 

 

https://plus.google.com/100479352836033641546/posts/3wW3fNH7GMV

Both articles cut through the pop media hype on Those papers

 

That second one is great: short and to the point.

 

(The first one is also a really good overview of the concepts behind the big bang model.)

[Enteroctopus]

A few competing ideas exist, and seem to pass in and out of favor depending on the latest science (and often who you ask):

 

The Big Crunch involves a beginning and an end, but as far as I know makes no predictions about anything else. Bang, expansion, contraction, crunch and done. This model is outlined in Douglas Adams' "Hitchhikers' Guide.." series as I think it was prominent at the time.

 

The Cyclic Universe is a bang-crunch-bang-crunch universe that is infinite in the time scale, finite in the spacial dimensions. There are no beginnings, but rather expansion and contraction, repeat. It is comforting to think that this is all just cyclical, but we have no way to prove anything "before" or "after," so it's a non-falsifiable claim, much like the Multiverse. If the universe were cyclical or a part of a multiverse or a dream of a unicorn we have no way of testing that, so it's pure speculation unless someone invents a "dreams of unicorns" detector. Maybe they will some day.

 

The Big Chill scenario involves a definite beginning with an infinite (in time) expansion and cooling leading eventually to everything, including black holes, evaporating away to nothing. Pretty dark and eerie idea, I'm not sure why no one's written a heavy metal album about it yet.

 

As far as "Crunch or Chill?" that depends on the curvature of the universe and/or the specifics of Dark Energy, both of which are under debate at the moment. More recent data has supported the Chill scenario, but then I've heard some evidence to indicate that Crunch might be making a comeback.

 

I like Crunch better, but that's a philosophical preference. Seems less like everything is pointless. Or maybe I should just accept it and become a Buddhist?

 

I am not aware of anyone who supports a "no beginning" scenario. No scientists anyway.

Edited April 22, 2015 by Enteroctopus

[joedale]

Why do I feel like everytime we smash an atom,.a universe has been created?.Relatively speaking.

[Strange]

I am not aware of anyone who supports a "no beginning" scenario. No scientists anyway.

 

Not even these guys: http://arxiv.org/abs/1404.3093

 

In this article we derive the second order Friedmann equations from the QRE, and show that this also contains a couple of quantum correction terms, the first of which can be interpreted as cosmological constant (and gives a correct estimate of its observed value), while the second as a radiation term in the early universe, which gets rid of the big-bang singularity and predicts an infinite age of our universe.