Posts by Robert Helling

More polymer oscillators (Oct 31, 2006)
The same day as the “Lessons from the LQG string” appeared on hep-th, there was another paper by Corichi,…
Lessons from the LQG string (Oct 17, 2006)
It’s now two years, that Giuseppe and I have put out out our paper comparing the usual quantisation of the…
KK Reference (Nov 17, 2005)
I am looking for a reference for the fact that it is impossible to get non-abelian gauge groups or chiral…
What does the density of vacua predict? (Sep 21, 2005)
Imagine a room where the floor has the profile (1)z(x,y)=sin(π/x). z(x,y) = \sin(\pi/x). Now, you throw a ball into…
Background independence (Aug 2, 2005)
Last week, Lee Smolin has put a paper on the arxive which on nearly fifty pages does not contain any…
Talking to myself (May 26, 2005)
Since nobody answered my question about how to properly generalize the calibration condition for BPS-branes if the gauge field…
Calibrations with gauge field (Apr 21, 2005)
Assume some closed string background preserving some susy. This comes with at least one Killing spinor whose square can…
To baldly go where no man went before (Feb 10, 2005)
In his reference frame, Lubos reports on a seminar by Reall on higher dimensional black holes and black rings and…
Effective theories and gravity (Oct 29, 2004)
To rebut fears that having my own blog would let me forget about the coffee table i would like…
Unlooping the LQG string (May 26, 2004)
A report on Thomas Thiemann’s seminar at DAMTP on his quantization of the bosonic string.