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Seminar on 2-Vector Bundles and Elliptic Cohomology, VI
In the 4th (and probably last) session of our seminar Birgit Richter talked in more detail about 0) elliptic curves and formal groups 1) “classical” elliptic cohomology (according to Landweber,...
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Gomi on Reps of p-Form Connection Quantum Algebras
Quantizing abelian self-dual p-form connections on (2p+2)-dimensional spaces gives rise to quantum observable algebras which are Heisenberg central extensions of the group of gauge equivalence classes...
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Herbst, Hori & Page on Equivalence of LG and CY
Yesterday, Kentaro Hori gave a talk on (unpublished) joint work with Manfred Herbst and David Page, another version of which I had heard a while ago in Vienna (→), on K. Hori, M. Herbst Phases of N=2...
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2-Palatini
A few entries ago, I was claiming that other people are implicitly claiming that the field content of D=11 supergravity encodes precisely a 3-connection taking values in a certain Lie 3-algebra (→)....
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Brodzki, Mathai, Rosenberg & Szabo on D-Branes, RR-Fields and Duality
I have begun reading Jacek Brodzki, Varghese Mathai, Jonathan Rosenberg, Richard J. Szabo D-Branes, RR-Fields and Duality on Noncommutative Manifolds hep-th/0607020 . This is a detailed study of the...
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K-Theory for Dummies, II
Before finishing the last entry I should review some basic facts about K-theory and D-branes, beyond of what I had in my previous notes (→). Apart from the Brodzki-Mathai-Rosenberg-Szabo paper (→)...
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Quillen's Superconnections -- Functorially
As explained for instance in Richard J. Szabo Superconnections, Anomalies and Non-BPS Brane Charges hep-th/0108043 a special case of Quillen’s concept of superconnections can be used to elegantly...
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Synthetic Transitions
On the occasion of the availability of the new edition of Anders Kock’s book on synthetic differential geometry (→) I want to go through an exercise which I wanted to type long time ago already. I’ll...
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The n-Category Café
A new group blog has been created. The n-Category Café. It’s hosted by John Baez, David Corfield and myself. The café is supposed to be the right place for the sort of discussion of mathematical...
View ArticleNot Even Wrong
The physics blog-wars have hit the world of publishing with Peter Woit’s Not Even Wrong and Lee Smolin’s The Trouble with Physics. Having given up blogging long ago, I still seem to have spent an...
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The Harmonic Oscillator in LQG
I’ve been trying to understand Thomas Thiemann’s riposte to the papers of Nicolai, Peeters and Zamaklar, Nicolai and Peeters and Helling and Policastro. I’m fairly busy right now with a paper of my own...
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The Master constraint program in LQG
I’m a little reluctant to post much on the master constraint program because I haven’t read much on it. But I thought I’d post this if others want to comment on the subject. My initial question is how...
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Lessons from the LQG string
It’s now two years, that Giuseppe and I have put out out our paper comparing the usual quantisation of the bosonic string to Thiemann’s loop inspired version. A bit to my surprise, that paper was of...
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More polymer oscillators
The same day as the “Lessons from the LQG string” appeared on hep-th, there was another paper by Corichi, Vukasniac and Zapata crosslisted from gr-qc discussing the loopy oscillator and coming to...
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Postdoctoral Position at the interface of Algebra, Conformal Field Theory and...
The Mathematics Department of the University of Hamburg has a postdoctoral position available in the area of Algebra, Conformal Field Theory and String Theory which is part of the Collaborative...
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