Bellissard, J. (1992) Gap Labelling Theorems for Schrödinger’s Operators. In: Waldschmidt, M., et al., Eds., From Number Theory to Physics, Springer, Heidelberg, 538-630.
http://dx.doi.org/10.1007/978-3-662-02838-4_12

has been cited by the following article:

• TITLE: The Gap Labelling Integrated Density of States for a Quasi Crystal Universe Is Identical to the Observed 4.5 Percent Ordinary Energy Density of the Cosmos

  AUTHORS: Mohamed S. El Naschie

  KEYWORDS: E-Infinity Theory, Fractal-Witten M-Theory, Gap Labelling Theorem, Density of States, Dark Energy Density, Noncommutative Geometry, K-Theory, Dimension Group

  JOURNAL NAME: Natural Science, Vol.6 No.16, November 26, 2014

  ABSTRACT: Condense matter methods and mathematical models used in solving problems in solid state physics are transformed to high energy quantum cosmology in order to estimate the magnitude of the missing dark energy of the universe. Looking at the problem from this novel viewpoint was rewarded by a rather unexpected result, namely that the gap labelling method of integrated density of states for three dimensional icosahedral quasicrystals is identical to the previously measured and theoretically concluded ordinary energy density of the universe, namely a mere 4.5 percent of Einstein’s energy density, i.e. E(O) = mc2/22 where E is the energy, m is the mass and c is the speed of light. Consequently we conclude that the missing dark energy density must be E(D) = 1 － E(O) = mc2(21/22) in agreement with all known cosmological measurements and observations. This result could also be interpreted as a strong evidence for the self similarity of the geometry of spacetime, which is an expression of its basic fractal nature.