MOST06 ANU Conference: Katrin Wendland's Talk on Anomaly Cancellation

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Discussion Overview

The discussion revolves around the MOST06 conference at ANU, specifically focusing on Katrin Wendland's talk on anomaly cancellation within the context of string theory. Participants share their experiences at the conference, including various talks and performances, and discuss related topics such as T-duality and index theory.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • Some participants express enthusiasm for Wendland's lectures on anomaly cancellation, noting the complexity and clarity of her presentations.
  • There is mention of index theory being significant in the discussion of anomaly cancellation for type IIA and heterotic E8xE8 theories.
  • One participant highlights the connection between Chern classes and a Machian perspective, suggesting further exploration is needed.
  • Another participant discusses the implications of T-duality and non-associativity in string theory, particularly in relation to C* algebra and bicategories.
  • Experiences from a theatrical show on QED are shared, with reflections on its effectiveness in communicating scientific ideas.
  • Participants note the intriguing relationship between D-brane charges and Poincare duality, as discussed in Brodzki's talk.
  • There is a reference to a book review by Paul Davies, which sparked interest among participants regarding the future of AI and evolution.

Areas of Agreement / Disagreement

Participants generally share a positive view of the conference and the talks, but there are multiple competing views regarding the implications and interpretations of the topics discussed, particularly concerning T-duality and the nature of associativity in string theory. The discussion remains unresolved on several technical points.

Contextual Notes

Some discussions involve complex mathematical concepts and theories that may depend on specific definitions and assumptions, which are not fully articulated in the posts. The relationship between various theories and their implications remains a topic of exploration rather than established consensus.

Who May Find This Useful

Readers interested in advanced topics in string theory, anomaly cancellation, and the interplay between mathematics and physics may find the discussions relevant.

Kea
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Conference website
http://tpsrv.anu.edu.au/Members/bouwknegt/MOST06

I'm having a great time in Canberra so far! Crisp and clear mornings, galahs galore and great talks. Today Katrin Wendland will give her first talk on anomaly cancellation. Notes for this week's stuff will probably end up on the website, so take a look.

:smile:
 
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Kea said:
Conference website
http://tpsrv.anu.edu.au/Members/bouwknegt/MOST06

I'm having a great time in Canberra so far! Crisp and clear mornings, galahs galore and great talks. Today Katrin Wendland will give her first talk on anomaly cancellation. Notes for this week's stuff will probably end up on the website, so take a look.

:smile:

Our Party Girl :smile:
 
Will you have a talk?

BTW a little curiosity off topic: are you going to see the theatrical show on QED?
If yes, give me a feedback, I'm interest in comunication of science with drama...
 
francesca said:
Will you have a talk?
BTW a little curiosity off topic: are you going to see the theatrical show on QED?

Yes, I'm talking next Saturday along with all the other students. That should be interesting. And we are planning on seeing QED on Tuesday - I'm really looking forward to it - and I'll keep you posted.

Wendland has given some comprehensive but clear lectures on anomaly cancellation for type IIA and heterotic E8xE8 theories. It does involve some amazing index theory. Of course, physically everything is upside down. Conditions on Chern classes should arise naturally in our Machian picture. But I might spend a bit more time looking at the details here.
 
The show QED was very enjoyable, even though I knew many of the Feynman anecdotes. It was mostly a one man play, and so relied quite heavily on an excellent and enthusiastic performance by Muirhead. We were all very tired after the first day of the workshop, and pleasantly surprised to find that we didn't fall asleep during the play!

Mathai and Hannabus spoke about their study of T-duality, which was very interesting because non-associativity appears when one looks at the C* algebra picture and then one is really forced to deal with proper bicategories (weak associativity). This may be a little alarming to some String theorists, but there is no avoiding it since the sort of 6D compactifications that String theory requires are in terms of the sort of torus bundles that were being looked at here.

More workshop on today...

:smile:
 
This conference is turning out to be very interesting! On Wednesday we heard from Brodzki on KK theory. Now this, folks, is state of the art String theory mathematics. He was very sweet and apologetic about how difficult it all was. What I wasn't expecting was to be told that D-brane charges have something to do with Poincare duality and that they had been studying this using NCG. It's just like what we're doing! Only what we're doing is a lot simpler. And lest there be any doubt, the thing that seemed to intrigue him the most was the mysterious way in which associativity could look like commutativity - which is exactly what we get when we turn the Stasheff K4 polytope into a polytope with hexagons (labelled by trees).

There was a copy of Nature (March 2006) on the coffee table containing a review by Paul Davies of a book by Ray Kurzweil entitled The singularity is near: when humans transcend biology. I was intrigued, and the guy sitting next to me happened to have a copy of the book so I took a look. Not philosophical enough for my taste, but very impressive: a vision of how our place in the cosmos is to create AI and move evolution into another phase...and how this is all going to happen in the next 50 years. Wow!

:smile:
 
Well, MOST06 is all wrapped up. Don't forget to look at the notes available on the web.

Kea said:
On Wednesday we heard from Brodzki ...
:smile:

Urs has picked up on the new KK theory paper by Brodzki et al:
http://golem.ph.utexas.edu/string/archives/000879.html#more

I'm back in Sydney now. Two great seminars at Macquarie tomorrow - one by Batanin and one by Neeman. A must see for anybody who's around.

:smile:
 

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