Farewell Feynman Diagrams?

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Re: Farewell Feynman Diagrams?

#41  Postby Rumraket » Oct 03, 2013 6:09 pm

:rofl:
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Re: Farewell Feynman Diagrams?

#42  Postby twistor59 » Oct 03, 2013 6:20 pm

newolder wrote:Lance Dixon/Sean Carroll blog post on "amplitudes'. The topic's work gets a brief mention too.
http://www.preposterousuniverse.com/blo ... mplitudes/
:thumbup:


Nice blog post. Good find :thumbup:
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Re: Farewell Feynman Diagrams?

#43  Postby DavidMcC » Oct 04, 2013 12:06 pm

Rumraket wrote::rofl:

It may seemfunny, Rumraket, but it is true that there is no generally accepted cosmology.
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Re: Farewell Feynman Diagrams?

#44  Postby newolder » Dec 07, 2013 2:59 pm

An event for Monday, euro-time: http://indico.cern.ch/conferenceDisplay ... fId=287249
EPFL seminars
The Amplituhedron
by Nima Arkani-Hamed (IAS)

Monday, 9 December 2013 from 11:00 to 12:00 (Europe/Zurich)
at EPFL, Lausanne ( Cubotron )

Description

Perturbative scattering amplitudes in gauge theories have remarkable simplicity and hidden infinite dimensional symmetries that are completely obscured in the conventional formulation of field theory using Feynman diagrams, suggesting the existence of a new understanding for what amplitudes “really are”, where Locality and Unitarity do not play a central role but are derived consequences of more primitive principles.

In this note we provide such an understanding for N = 4 SYM scattering amplitudes in the planar limit, which we define as “the volume” of a new mathematical object –the Amplituhedron– generalizing the Positive Grassmannian. Locality and Unitarity
emerge hand-in-hand from positive geometry.
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Re: Farewell Feynman Diagrams?

#45  Postby newolder » Dec 09, 2013 3:07 pm

Haven't found a tewb for that but this sounds similar and is from 17th September... (it's also 131 minutes long, phew!1)
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Re: Farewell Feynman Diagrams?

#46  Postby newolder » Dec 10, 2013 2:55 pm

1st paper, The Amplituhedron, posted.
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Re: Farewell Feynman Diagrams?

#47  Postby iamthereforeithink » Dec 10, 2013 4:28 pm

newolder wrote:1st paper, The Amplituhedron, posted.


Very interesting. Thanks :thumbup:

newolder wrote:Haven't found a tewb for that but this sounds similar and is from 17th September... (it's also 131 minutes long, phew!1)


"server not found" :think:
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Re: Farewell Feynman Diagrams?

#48  Postby newolder » Dec 10, 2013 4:32 pm

iamthereforeithink wrote:
newolder wrote:1st paper, The Amplituhedron, posted.


Very interesting. Thanks :thumbup:

newolder wrote:Haven't found a tewb for that but this sounds similar and is from 17th September... (it's also 131 minutes long, phew!1)


"server not found" :think:

:cheers: hic...
Trying going here and follow "Watch the video"...
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Re: Farewell Feynman Diagrams?

#49  Postby iamthereforeithink » Dec 10, 2013 5:38 pm

newolder wrote:
iamthereforeithink wrote:
newolder wrote:1st paper, The Amplituhedron, posted.


Very interesting. Thanks :thumbup:

newolder wrote:Haven't found a tewb for that but this sounds similar and is from 17th September... (it's also 131 minutes long, phew!1)


"server not found" :think:

:cheers: hic...
Trying going here and follow "Watch the video"...


Still no workie. I'll try looking it up elsewhere.
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Re: Farewell Feynman Diagrams?

#50  Postby newolder » Dec 10, 2013 6:12 pm

Have you tried switching it off and then back on again? [/IT laffs]
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Re: Farewell Feynman Diagrams?

#51  Postby newolder » Jan 28, 2018 3:33 pm

Not just Feynman diagrams but the notion of spacetime gets doomed in this latest Nima talk. It's longer than an hour, starts about 15 minutes in and includes a Q&A near the end. Fascinating take on the history, current and future of physics...
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Re: Farewell Feynman Diagrams?

#52  Postby Made of Stars » Jan 29, 2018 10:51 am

So, what's replacing spacetime then?
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Re: Farewell Feynman Diagrams?

#53  Postby newolder » Jan 29, 2018 11:46 am

Combinatronics (is that a thing? :dunno: ) - by the look and sound of things related to the strong force but, as Nima notes, "It's early days" and what seems pertinent today may change quickly in light of developments. (Much hedging.)

The 1st relevant pdf from 2014 is here (probably linked to earlier in the topic) for the technically minded.
...
In the remainder of this section, we will de- scribe how all such identities arise homologically in the Grassmannian, and can be understood in purely geometric (even combinatorial) terms. In section 12, we will illustrate the power of the combinatorial tools at our disposal, by giving an explicit classification of all Yangian-invariants and their relations through N4MHV.
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Re: Farewell Feynman Diagrams?

#54  Postby newolder » Apr 05, 2018 3:26 pm

newolder wrote:Combinatronics (is that a thing? :dunno: ) ...

Sure it is, phew! Except I spelled it wrong. :doh: From the excellent Numberfile team...
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Re: Farewell Feynman Diagrams?

#55  Postby newolder » Jun 25, 2018 11:20 am

The following public lecture by Nima Arkani-Hamed at SLAC was published recently on the tubes. It's similar to the one a few posts above and discusses the end of spacetime, again, in fundamental theoretical physics studies...
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