A Space & astronomy forum. SpaceBanter.com

Go Back   Home » SpaceBanter.com forum » Astronomy and Astrophysics » Astronomy Misc
Site Map Home Authors List Search Today's Posts Mark Forums Read Web Partners

Cosmology Solved?



 
 
Thread Tools Display Modes
  #1  
Old September 26th 12, 07:14 AM posted to rec.arts.sf.science,sci.physics,sci.astro
John Park
external usenet poster
 
Posts: 155
Default Cosmology Solved?

If *changes in* length and time are quantised at the Planck level, then
many problems (e.g. the size of the cosmological constant) are solved.
Maybe.

http://arxiv.org/abs/1209.5386

--John Park

---------------
Janus, a novel
http://chizinepub.com/books/janus.php
  #2  
Old September 27th 12, 10:01 PM posted to rec.arts.sf.science,sci.physics,sci.astro
Yousuf Khan[_2_]
external usenet poster
 
Posts: 1,692
Default Cosmology Solved?

On 26/09/2012 2:14 AM, John Park wrote:
If *changes in* length and time are quantised at the Planck level, then
many problems (e.g. the size of the cosmological constant) are solved.
Maybe.

http://arxiv.org/abs/1209.5386


Discrete space-time is something I personally believe in. But how
exactly is the cosmological constant related to the Planck scale?

Yousuf Khan
  #3  
Old September 30th 12, 11:06 AM posted to sci.physics,sci.astro,rec.arts.sf.science
John Park
external usenet poster
 
Posts: 155
Default Cosmology Solved?

Yousuf Khan ) writes:
On 26/09/2012 2:14 AM, John Park wrote:
If *changes in* length and time are quantised at the Planck level, then
many problems (e.g. the size of the cosmological constant) are solved.
Maybe.

http://arxiv.org/abs/1209.5386


Discrete space-time is something I personally believe in. But how
exactly is the cosmological constant related to the Planck scale?

Yousuf Khan


Deiss, the author, emphasises that he's not quantising space and time but only
changes in them.

You can probably make sense of the argument better than I can, but here's
my attempted paraphrase, as I understand what he's doing.

He considers the vacuum as a set of harmonic oscillator fields
correponding to virtual particles, and asks about the effect of the
expansion of the universe subject to his quantisation conditions. The
time-quantisation implies that changes in the periods of the oscillators
are quantised, and this condition gives a limit on the energy of those
oscillators that can respond to the expansion. The space-quantisation in
conjunction with the uncertainty principle gives a limit on the momenta of
these "interacting" virtual particles. Because of his quantistion model
both limits are expressed in terms of Planck quantities.

Together the two limits predict a vacuum energy which is a function of
the Hubble parameter. He identifies this energy with the dark energy of the
universe, AKA the cosmological constant, thus linking the Planck and
cosmological scales without the usual 120-order-of-magnitude discrepancy.
(And implying that [probably] only virtual photons and three virtual
neutrinos are "interacting" particles...with implications for the neutrino
masses.)

I haven't worked though Deiss's argument in detail, so I hope I'm not
misrepresenting him; and I hope this is some help.


--John Park

---------------
Janus, a novel
http://chizinepub.com/books/janus.php
 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Obama Came on Good But Solved Nothing G=EMC^2 Misc 1 September 9th 11 10:57 PM
CDM Cosmology (was formation of dwarf galaxies in CDM cosmology) Nicolaas Vroom Research 3 February 3rd 10 12:53 AM
Problem solved! Cruithne3753 Policy 2 February 10th 06 08:44 PM
Alien UFO's solved Ray Vingnutte Misc 2 December 23rd 04 03:01 PM
Big Mystery Solved Bob Carlson Astronomy Misc 15 January 16th 04 09:19 PM


All times are GMT +1. The time now is 01:22 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 SpaceBanter.com.
The comments are property of their posters.