Cosmic Variance

Cosmic Variance is a new group weblog that is written time to time by Mark Trodden, Risa Wechsler, Sean Caroll, etc. It is about astrophysics and the newest outcomes of the relevant theories of cosmology. Very interesting job!

Shahriar Afshar's weblog

Shahriar Afshar is known in physics community by his quantum experiment of single photon. Shahriar has made a weblog and write time to time about his experiment in it. He wanted his readers to ask him their questions and he will be answering them. A good opportunity to learn more about the experiment.

I welcome Shahriar to the community of scientific webloggers.

Buissiness of Citation in Physics Community

Yes, in today's Physics community there is such a very important buissiness. Yes, the lack of fair scientific view on papers.

"He never references us, so we're not gonna reference him."

A statistical formalism of Causal Dynamical Triangulations

Recently, I and Fotini Markopoulou rewrote the Causal Dynamical Triangulations model as a spin system and provided a new method of solution of the model. The model was studies before this by Ambjorn (Niels Bohr Institute), Anagnostopoulos (Univ. of Crete) and Loll(Institute for Theoretical Physics, Utrecht University). They invented this path integral approach toward 2d quantum gravity and applied the generating functional method in their solution. (Refrence)

In addition, they have extended the model to higher dimensions (refrence) and coupled it to matter (refrence). It is interesting that a 4 dimensional spacetime is emereged by gluing 4 simplices in a specific way.

Now one can have enough fun with the new approach to the solution of the 2 dimensional model, RG transform its couplings easliy and predict the value of cosmological constant!

These models are based on the notion of the existence of a pre-assumed time in the universe and construction is led into that direction, otherwise the dimensionality of the global spacetime grows fast to infinity.
(The paper - more pictures)

Meeting on non-perturbative background independent Quantum Gravity

Here is the official webpage of this year's meeting on non-perturbative background independent Quantum Gravity, which takes place from 10-14 October 2005 at the Albert-Einstein-Institute in Potsdam, Germany.

Sean Carroll's lectures

Sean Carroll, the author of the book of Spacetime and Geometry, is giving a series of lectures in CERN about cosmology for particle physicists. The video of these talks are available a few hours after each in here. More information about this lecture.