Quantum Spacetime

  • Thread starter Varon
  • Start date
  • #26
marcus
Science Advisor
Gold Member
Dearly Missed
24,738
784
... Trying to visualize prior to big bang is not predictive power it is prior conditions.
Not sure what you are trying to say, but bounce cosmology models do have predictive power.

Any scientific reconstructions of the past, whether it extends back before the start of expansion or merely back to the Jurassic, must be based on some model that is testable by what we can observe in the present. We do not look at the past, we look at its predicted effects, its imprint on the present.

We have to be able to verify early universe cosmology models using what we can observe in the present. Bounce cosmology models are no different in this respect. The bounce has a predicted imprint which we can look for in the ancient light (CMB-polarization mapping) and either find or not find. This has gotten the interest of a number of early universe phenomenologists (whose job is to think up and evaluate tests of models like this), so there are papers being written about it.

Last time I looked there were some 33 test-oriented papers on this written since beginning of 2009---they show broad agreement. Also last year there was a conference partly on this topic. It is a growing research area. If you would like to check out the papers, here's a link:
http://www-library.desy.de/cgi-bin/spiface/find/hep/www?rawcmd=FIND+%28DK+QUANTUM+GRAVITY%2C+LOOP+SPACE+OR+QUANTUM+COSMOLOGY%2C+LOOP+SPACE%29+AND+%28PRIMORDIAL%2C+FLUCTUATION+OR+INFLATION+OR+COSMIC+BACKGROUND+RADIATION%29+AND+DATE+%3E+2008&FORMAT=www&SEQUENCE=citecount%28d%29 [Broken]
 
Last edited by a moderator:
  • #27
5,601
39
Varon: I'd generally agree with your posts #1 and #4.

I am personally convinced space, time, matter, the four fundamental forces,etc are intimately related,,,far more than we yet understand. It's possible that the underlying unity is information, via things like the holographic principle, for example.

Leonard Susskind discuss quite a bit about information in THE BLACK HOLE WAR, his long standing disagreements with Stephen Hawking..

and Charles Seife has an interesting book DECODING THE UNIVERSE, "How the new science of information is explaining everything in the cosmos from our brains to black holes."
(That's an exaggeration, as I recall, he does not 'explain itall".)

It's been too long since I read it, but I skimmed a few items:

What is it that separates us from calculators and computers?

..quantum theory and relativity theory are findamentally theories of information.

perception..and information...is reality,

quantum entanglement is also a problem of information transfer....

Time for me to reread the book!
 

Related Threads for: Quantum Spacetime

  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
6
Views
4K
  • Last Post
Replies
17
Views
4K
Replies
10
Views
2K
  • Last Post
Replies
7
Views
2K
Replies
24
Views
6K
Replies
7
Views
1K
Replies
21
Views
4K
Top