Welcome, Guest. Please Login or Register
The Science Forums  - Logo
  The internet's most comprehensive science reference website: Science File. http://www.sciencefile.org
free debate
  Home 20 Most Recent Posts HelpSearchLoginRegister Science File  
 
Pages: 1 2 3 ... 5
E8 (Read 11402 times)
Iron Chicken
Ex Member


E8
Nov 15th, 2007 at 6:01pm
 
Back to top
 
 
IP Logged
 
simeon
Ex Member


Re: E8
Reply #1 - Nov 17th, 2007 at 1:05pm
 
How strange,  I put down the Guardian newspaper having read a small piece about someone called Lisi proposing a much simplified theory of dimensions and matter.  I go on line then see this post!

Looking at his paper, I like the coloured triangles the best!

Anyone want to expound further on this.  Is it a goer?
Back to top
 
 
IP Logged
 
SEF
Ex Member


Re: E8
Reply #2 - Nov 17th, 2007 at 1:17pm
 
Quote:
Is it a goer?

I haven't risked the PDF (my Vista security objected to some combination of that and the new forum dereferer gubbins!). However, from the NS snippet, it looks to be ticking the right boxes or joining the dots - ie fulfilling the symmetries in a "pretty" way. It's now up to reality to oblige with the missing bits or decline to play along. A beautiful theory or proof is often correct but not by any means guaranteed to be so.
Back to top
« Last Edit: Nov 17th, 2007 at 1:18pm by N/A »  
 
IP Logged
 
Doc Strangebrew
Head of Faculty
******
Offline


"Just like herding cats!"

Posts: 1814
the netherlands
a theory of...well... the lot....
Reply #3 - Nov 17th, 2007 at 1:35pm
 
http://arxiv.org/pdf/0711.0770

Lee Smolin seems taken...what do the panel think...has it got legs...or to put it another way... does it boogie in a four dimensional base manifold?

Be kindda cute if it really explained life the universe and everything...but then again can anything be that simple...then again... well why not?
Back to top
 

“I will not be pushed, filed, stamped, indexed, briefed, debriefed, or numbered!"
 
IP Logged
 
newolder
Ex Member


Re: E8
Reply #4 - Nov 26th, 2007 at 4:45am
 
The neatest thing i've found so far (i haven't finished the pdf yet...) in E8 is the invariance under 2pi/3 rotation, or Triality. It's a bit like the 'Legs of Man' symbol, in my mind. (Although i know a LoM picture is only a 2-D 'shadow' of Triality - i.e. one of the 'Legs' is rotated pi/3 out of the page.)  

Anyhoo, it certainly passes observation so far, the supersymmetry implied will be clinching, again (i.e. when/if it is observed). Oh, and to have it re-written in less jargon would be nice - Philip Pullman does a good job there - even though i know it would make the explanation longer, it may help others a bit earlier along the road to catch up... Smiley
Back to top
« Last Edit: Nov 26th, 2007 at 5:03am by N/A »  
 
IP Logged
 
newolder
Ex Member


Re: E8
Reply #5 - Nov 28th, 2007 at 7:11am
 
Quote:
How strange,  I put down the Guardian newspaper having read a small piece about someone called Lisi proposing a much simplified theory of dimensions and matter.  I go on line then see this post!

Looking at his paper, I like the coloured triangles the best!

Anyone want to expound further on this.  Is it a goer?


This is way, way beyond strangeness.  Smiley

This movie (paste url into QuickTime or plug-in) shows it beautifully, i think::
http://www.deferentialgeometry.org/anim/e8rotation.mov

A part of the definition of  Cool, or should be.

Added:: The "E8 Theory Summary" on page 44 of this pdf seems correct, so far:: http://www.deferentialgeometry.org/talks/ILQGS07/Lisi.pdf

ultra- Cool  Smiley
Back to top
« Last Edit: Nov 28th, 2007 at 8:26am by N/A »  
 
IP Logged
 
Orval
Ex Member


Re: E8
Reply #6 - Nov 28th, 2007 at 1:51pm
 
Since I started reading about this kid and this seemingly E8 hypothesis on the theory of all, I 've been trying to understand what this E8 is exactly.

And I have to say that my abilities to comprehend what this really represents has been very limited. It's like the string theory...as hard as I try, I just can't imagine something vibrating producing elementary particules.

I know our evolution hasn't allowed our brains to understand more than it needed to survive in the prehistoric world...but still..it's very frustrating!

Can someone explain me in 1 simple sentence what I should understand about the E8 theory? Thanks
Back to top
 
 
IP Logged
 
newolder
Ex Member


Re: E8
Reply #7 - Nov 28th, 2007 at 2:05pm
 
Quote:
Since I started reading about this kid and this seemingly E8 hypothesis on the theory of all, I 've been trying to understand what this E8 is exactly.

And I have to say that my abilities to comprehend what this really represents has been very limited. It's like the string theory...as hard as I try, I just can't imagine something vibrating producing elementary particules.

I know our evolution hasn't allowed our brains to understand more than it needed to survive in the prehistoric world...but still..it's very frustrating!

Can someone explain me in 1 simple sentence what I should understand about the E8 theory? Thanks


Future generations - if we produce any,  Roll Eyes - will take E8 on board easier than the current set of memes and genes can express because it is, from now onwards, a demonstrable result.

What a get-out clause, eh?  Wink

P.S. It is definitely beautiful too.  Smiley


Back to top
« Last Edit: Nov 28th, 2007 at 2:07pm by N/A »  
 
IP Logged
 
newolder
Ex Member


Re: E8
Reply #8 - Dec 1st, 2007 at 12:02pm
 
Quote:
How strange,  I put down the Guardian newspaper having read a small piece about someone called Lisi proposing a much simplified theory of dimensions and matter.  I go on line then see this post!

Looking at his paper, I like the coloured triangles the best!

Anyone want to expound further on this.  Is it a goer?


Oh yes! but it's going to take time-effort to get it further into the meme-pool methinks...  Cool

http://deferentialgeometry.org/talks/ILQGS07/Lisi.pdf

Page 44: E8 theory summary

The symbols for “A [underscore] dash dot”

A is real.

[underscore] dash dot => (maps to) “positive, definite”. Time points ->, to the future. We are sure A is real, however, Stephen Hawking in 1974 conjectured, “Time may be complex.”

Imagine the lanes in an Olympic arena where the lane width grows exponentially in time*. How do you measure forward progress and who is racing against whom as time -> ∞ ? What if the lane marking lines also spread at such a rate? Does that make any difference to anything at all?

Imagine next, the depth of the pool increases at the same rate.

Finally (and only because we can count to three properly through triality – invariance under rotation by 2π/3) imagine that the spectators’ stopwatches record two (or 3 or more…) dimensions of time. The scope of this proper, General Relativistic time, T = it, is infinitely larger than the number of numbers between e and e + 1, for example, and is independent of the unit of time used to gauge it.

This flavour of e8 on youtube-with-the-sound-on has a certain appeal to those of a certain demography:: http://www.youtube.com/watch?v=7YiY7t29M0c&feature=related

And this one is more tutorial:: http://www.youtube.com/watch?v=BaQ0EjobZZ4&feature=related

ed. Great i-times, now. Smiley

* Crudely, =<|

The boundary, |, is at infinity.

Questions arising:

Breitenlohner-Freedman cosmologies require a cosmological constant of precisely what, please?

How do I get to ride dksi near to a 4-d ‘black hole’, please? Mwa, ha, haaa!
Back to top
« Last Edit: Dec 1st, 2007 at 6:50pm by N/A »  
 
IP Logged
 
newolder
Ex Member


Re: E8
Reply #9 - Dec 3rd, 2007 at 4:57pm
 
...

Bikerman::

From: "no-reply@frihost.com" <no-reply@frihost.com>
Sent: Monday, 3 December, 2007 6:35:01 PM
Subject: Topic Reply Notification - Newton Institute Lecture - String Theory


Hello,

You are receiving this email because you are watching the topic, "Newton Institute Lecture - String Theory" at Frihost. This topic has received a reply since your last visit. You can use the following link to view the replies made, no more notifications will be sent until you visit the topic.

http://www.frihost.com/forums/viewtopic.php?p=709717#709717

If you no longer wish to watch this topic you can either click the "Stop watching this topic link" found at the bottom of the topic above, or by clicking the following link:

http://www.frihost.com/forums/viewtopic.php?t=85075&unwatch=topic

--
The Frihost Team
::

is re-surfacing at frihost - scarred but not beaten by his recent monumental efforts. He has converted some (all!) of David Gross's, "The coming revolution...", lecture-cast* slides to htm already. Hero, Bikerman, he.

Anyhoo, historical note:

http://www.valdostamuseum.org/hamsmith/coquad.html

Is some related work from 1978 showing that the 'smash product', /\, of an S4 with another yields an S8 and Spin(8) or e8 is the 'maximal group' to describe it. The 248 roots of e8 are projected into a 3-d + time S3 as shown at the youtubes. Each of the roots maps to a 'particle' of the standard model + Higgs and includes supersymmetric reflections - some of which aren't 'nailed-down' yet, but should be soonest - and the connections betwixt. Like a buckyball but bouncier.  Smiley

_____________

20th century un-reason does not contain the energy for anything to spin.

Everything spins and the universe expands at an accelerating rate.

The Lie algebra Clifford-bundle with minimal action, E8, or Spin(8) contains an 8 dimensional hypersphere upon which, 248 particles** are arranged and are connected to a ‘central’ observer in the simplest way possible. Two of the roots are connected by something alien or quartic. It is a hypothesis of the theory that Triality*** will help resolve quartic elements successfully. Hooraah! The next 8 connect to generate all phenomena observed hitherto. Including some mathematical ‘ghosts’ of earlier reason.

It’s a bit like flying a kite fom the deck of Helen McCarthy’s trimaran in a hoolery-blow that has one more string or button than you can comfortably manage. It's time has come so let it go.  Smiley

Lisi,"It's either spectacularly right or spectacularly wrong."

Are they on seasonal sale yet anywhere? California would be my first guess... Smiley

Golden compasses are built after hypernovae. The stories'll end hereabouts alright but they get reflected at c over very much greater plains than Tuvan's imagine****, i guess.  Undecided

* e.g. the youtube@ :: http://motls.blogspot.com/2007/10/david-gross-coming-revolutions-in.html

** A few of the more exotic beasties are yet to be described fully: as the theory unfolds, these will become clearer in their ‘language’ definition.

*** Tommy Cooper riding a bike with 3 spokes, the cavalry, calvary or whatever on-tow.  Wink

**** Tuvan throats:: http://www.huunhuurtu.com/
and
http://www.youtube.com/watch?v=TVyyhHFKI8E

Smiley
Back to top
« Last Edit: Dec 4th, 2007 at 9:03am by N/A »  
 
IP Logged
 
newolder
Ex Member


Re: E8
Reply #10 - Dec 5th, 2007 at 8:38am
 
e8 in all its glory

...

wikipedia.

This is how frame 1 on the 'lift' animation looks. It is the net of connections to its 'roots'/nodes. Symbollically each node is labelled as per what it says on the tin.

Some of the connections get weird, some are, as yet, unspoken.

Next, more tests...  Cool
Back to top
« Last Edit: Dec 5th, 2007 at 8:43am by N/A »  
 
IP Logged
 
Andy The Boss
Chancellor
Offline



Posts: 7315

Areas of Particular Scientific Interest: Astronomy, astrophysics, cosmology, space exploration, archaeology, palaeontology, geology.
Re: E8
Reply #11 - Dec 5th, 2007 at 2:59pm
 
Somebody got a spirograph for their birthday then.

Very pretty. Completely meaningless.
Back to top
 

"Physics is like sex- sure, it has its practical applications, but that's not why we do it."- Richard Feynman
WWW  
IP Logged
 
SEF
Ex Member


Re: E8
Reply #12 - Dec 5th, 2007 at 3:24pm
 
That's not a spirograph image. You can make those "roses" with cotton threads though. Whereas it may take much finer strings to make the E8! Roll Eyes
Back to top
« Last Edit: Dec 5th, 2007 at 3:26pm by N/A »  
 
IP Logged
 
newolder
Ex Member


Re: E8
Reply #13 - Dec 5th, 2007 at 3:29pm
 
It seems like designers are crying out for this kind of stuff...

http://www.ted.com/index.php/talks/view/id/197

Even if it is only toilet brushes.  Smiley
Back to top
 
 
IP Logged
 
newolder
Ex Member


Re: E8
Reply #14 - Dec 5th, 2007 at 3:35pm
 
Andy The Boss wrote on Dec 5th, 2007 at 2:59pm:
Somebody got a spirograph for their birthday then.

Very pretty. Completely meaningless.


The meaning, in consistent, logical symbology is there for all to read. 2000 years of pre-recorded effort is summarised and connected stunningly well, imho. At which point does it become 'meaningless' for you?
Back to top
 
 
IP Logged
 
Andy The Boss
Chancellor
Offline



Posts: 7315

Areas of Particular Scientific Interest: Astronomy, astrophysics, cosmology, space exploration, archaeology, palaeontology, geology.
Re: E8
Reply #15 - Dec 5th, 2007 at 3:54pm
 
newolder wrote on Dec 5th, 2007 at 3:35pm:
Andy The Boss wrote on Dec 5th, 2007 at 2:59pm:
Somebody got a spirograph for their birthday then.

Very pretty. Completely meaningless.


The meaning, in consistent, logical symbology is there for all to read. 2000 years of pre-recorded effort is summarised and connected stunningly well, imho. At which point does it become 'meaningless' for you?


At the point I see a complex diagram with absolutely no annotation and no legend. It may as well have been drawn by my niece with her spirograph for all the meaning it contains.
Back to top
 

"Physics is like sex- sure, it has its practical applications, but that's not why we do it."- Richard Feynman
WWW  
IP Logged
 
newolder
Ex Member


Re: E8
Reply #16 - Dec 5th, 2007 at 4:37pm
 
That's simply not the case. Iff, as intended by the author(s).  Smiley

If you can't read it first time through, there's no worry. There's possibly plenty of time to take it on-board, if you want to.
Back to top
 
 
IP Logged
 
Iron Chicken
Ex Member


Re: E8
Reply #17 - Dec 5th, 2007 at 5:09pm
 
Andy The Boss wrote on Dec 5th, 2007 at 2:59pm:
Somebody got a spirograph for their birthday then.

Very pretty. Completely meaningless.


There's an "interesting" take on it here by Lubos Motl.
Back to top
 
 
IP Logged
 
newolder
Ex Member


Re: E8
Reply #18 - Dec 5th, 2007 at 6:08pm
 
Quote:
Andy The Boss wrote on Dec 5th, 2007 at 2:59pm:
Somebody got a spirograph for their birthday then.

Very pretty. Completely meaningless.


There's an "interesting" take on it here by Lubos Motl.


Any incorrect hypothesis or calculation it (e8) makes means it goes straight in the bin. Does Lubos or anyone have an observation contra to any of its numbers? Not yet... The supersymmetry test at the LHC is clinching either way, it seems.

Anyone running a book yet?  

Quote:
...What you're doing is just a completely childish and trivial sequence of mistakes and meaningless mathematical masturbation that puts you into the same category as Tony Smith or Garrett Lisi.

And that's the memo.


"It takes one to know one."

Back to top
« Last Edit: Dec 5th, 2007 at 6:21pm by N/A »  
 
IP Logged
 
Andy The Boss
Chancellor
Offline



Posts: 7315

Areas of Particular Scientific Interest: Astronomy, astrophysics, cosmology, space exploration, archaeology, palaeontology, geology.
Re: E8
Reply #19 - Dec 6th, 2007 at 2:00am
 
newolder wrote on Dec 5th, 2007 at 4:37pm:
That's simply not the case.


I'm afraid it is. That diagram is not annotated, not explained and not described. I'm sure there is lots of useful information in it, but I should have thought that if its creators wanted people to gasp and say "Wow, like, far out" there should be at least some explanation of what the hell it is. The whole point of creating diagrams is to communicate information, and all that diagram tells me is that you've been a nice chap and provided the forums with its first Christmas decoration. Thanks for that!
Back to top
 

"Physics is like sex- sure, it has its practical applications, but that's not why we do it."- Richard Feynman
WWW  
IP Logged
 
Pages: 1 2 3 ... 5