Planck analysis closes universe

More data required to confirm findings

Study matter and its motion through spacetime...

Moderators: Calilasseia, ADParker

Re: Planck analysis closes universe

#21  Postby hackenslash » Nov 07, 2019 9:07 am

newolder wrote:Indeed it is, and without ruling out an extra, large dimension to space the Steinhardt & Turok double Klein bottle comes into play too...


I was mulling that as I hit post.
User avatar
hackenslash
 
Name: The Other Sweary One
Posts: 21439
Age: 51
Male

Country: Republic of Mancunia
Print view this post

Ads by Google


Re: Planck analysis closes universe

#22  Postby LucidFlight » Nov 07, 2019 10:42 am

Spearthrower wrote:
hackenslash wrote:A 4-torus is also a potential solution.


Only if the ineffable is trying to fuck with us!

Physics classes in 20 years: Ok, so over the course of the next 3 years, we're all going to try and wrap our heads around a 4 dimensional torus. Yes, that's all we'll be doing. :lol:


No pun intended.
OFFICIAL MEMBER: QUANTUM CONSTRUCTOR CONSCIOUSNESS QUALIA KOALA COLLECTIVE.
User avatar
LucidFlight
RS Donator
 
Name: Kento
Posts: 10792
Male

Country: UK/US/AU/SG
United Kingdom (uk)
Print view this post

Re: Planck analysis closes universe

#23  Postby CdesignProponentsist » Nov 07, 2019 11:40 pm

hackenslash wrote:Well worth noting - as newolder alluded to - that positive curvature measured locally doesn't rule out the possibility that space is flat or even open on larger scales.


Totally. I was more curious about the estimated size extrapolated from the measured curvature in the featured article.

Also, a 3-sphere isn't the only closed solution available. A 4-torus is also a potential solution.


The Homer model?

Image
"Things don't need to be true, as long as they are believed" - Alexander Nix, CEO Cambridge Analytica
User avatar
CdesignProponentsist
 
Posts: 12609
Age: 53
Male

Country: California
United States (us)
Print view this post

Re: Planck analysis closes universe

#24  Postby newolder » Nov 09, 2019 12:58 pm

Just to note that I have finally tracked down the arxiv link for the work in the O.P. phew! Perhaps the radius of curvature question up-topic may now be answered?*

https://arxiv.org/abs/1911.02087

* ETA The paper has that the radius of curvature is given by Rc = (c/H0) |Ωk|-0.5

Its estimate for Ωk is -0.0438 (with error supplied) and their revised estimate for H0 is 54.4 km/s/Mpc

Substitution gives Rc = 26.4 Gpc or about 86 billion light years.

But do check my sums...
I am, somehow, less interested in the weight and convolutions of Einstein’s brain than in the near certainty that people of equal talent have lived and died in cotton fields and sweatshops. - Stephen J. Gould
User avatar
newolder
THREAD STARTER
 
Name: Albert Ross
Posts: 7308
Male

Country: Feudal Estate number 9
Print view this post

Re: Planck analysis closes universe

#25  Postby Macdoc » Nov 10, 2019 1:28 pm

Just watched Einstein and Eddington movie again....really enjoyed it and seeing Max Planck and Einstein interacting in the movie was a crazy time shift pardon the pun.

Einstein really needs a mini-series along the same lines as the movie but with enough time to tell the various wonderful and sometimes heartbreaking stories surrounding Einstein and the luminaries around him.
Tenant was an excellent choice of for Eddington as was the Einstein casting.



Reminder of how far we've come from the comfort of an orderly Newtonian universe.
Travel photos > https://500px.com/macdoc/galleries
EO Wilson in On Human Nature wrote:
We are not compelled to believe in biological uniformity in order to affirm human freedom and dignity.
User avatar
Macdoc
 
Posts: 17156
Age: 72
Male

Country: Canada/Australia
Australia (au)
Print view this post

Re: Planck analysis closes universe

#26  Postby CdesignProponentsist » Nov 11, 2019 8:02 pm

newolder wrote:Substitution gives Rc = 26.4 Gpc or about 86 billion light years.

But do check my sums...


From what I understand a lower limit for no detectable curvature would be around 90 billion light years. Is that correct? If so this sounds about right.
"Things don't need to be true, as long as they are believed" - Alexander Nix, CEO Cambridge Analytica
User avatar
CdesignProponentsist
 
Posts: 12609
Age: 53
Male

Country: California
United States (us)
Print view this post

Re: Planck analysis closes universe

#27  Postby hackenslash » Nov 11, 2019 8:52 pm

Unless I missed something, that would be the lower limit for a direct measurement, while this is giving the radius, meaning that the result would have to be multiplied by 2π.
User avatar
hackenslash
 
Name: The Other Sweary One
Posts: 21439
Age: 51
Male

Country: Republic of Mancunia
Print view this post

Previous

Return to Physics

Who is online

Users viewing this topic: No registered users and 1 guest