Recently, I read a very intereting paper by Thomas Thiemann,
It is based on this idea that if the Lagrangean for a scalar field coupled to General Relativity only contains derivatives, then it is possible to completely deparametrise the theory. This means that
1. Physical observables...
Cosmic-ray electrons and positrons propagating in the Galaxy produce diffuse gamma-rays via the inverse Compton (IC) process.
The low energy target photon populations with which the cosmic-rays interact during propagation are produced by stars, this stellar light being reprocessed by...
I think this paper is very exciting since it activates the basic idea of primary Casimir effect as a root to identify the geometrical fluctuation of space, before big bang. However, what I do not understand is that how one can talk about "charged vacuum", those vacuum bubbles which get charged...
Marcus: Thanks for inviting me to another thread. I will read it but it seems to be too long! I will write about the quantum information appraoch soon. it is basically a thrid appraoch different from Ansari's and isolated horizon. Thanks for asking.
Self-adjoint: My read is that any single node...
I agree Chronos that Ansari's work is a critical point for LQG, if his work is right, which simply seems to be. Though, it cannot rule out or in LQG. There are some dark points Chronos. I think this is not a physical or unphysical result at all. Let me put this in this way. Lee Smolin in his...
Recently, I read a beautiful paper in which it is proven that ANY surface in LQG contains degeneracy, no matter it being a boundary horizon or whatever else. (http://uk.arxiv.org/abs/gr-qc/0603121) This degeneracy is such that the surface degeneracy is A/4. This is a critial discovery in LQG and...
"Black string solutions with negative cosmological constant"
By Robert B. Mann, Eugen Radu, Cristian Stelea
It is a remarkable work in my point of view. They present an arguments for the existence of new black string solutions with negative cosmological constant.
These higher-dimensional...
"Black string solutions with negative cosmological constant"
By Robert B. Mann, Eugen Radu, Cristian Stelea
It is a remarkable work in my point of view. They present an arguments for the existence of new black string solutions with negative cosmological constant.
These higher-dimensional...