• Publications
  • Influence
A theory of everything?
In his later years, Einstein sought a unified theory that would extend general relativity and provide an alternative to quantum theory. There is now talk of a ‘theory of everything’ (althoughExpand
  • 278
  • 24
Renormalizable Lagrangians for Massive Yang-mills Fields
Renormalizable models are constructed in which local gauge invariance is broken spontaneously. Feynman rules and Ward identities can be found by means of a path integral method, and they can beExpand
  • 272
  • 14
  • PDF
The Scattering Matrix Approach for the Quantum Black Hole an Overview
If one assumes the validity of conventional quantum field theory in the vicinity of the horizon of a black hole, one does not find a quantum mechanical description of the entire black hole that evenExpand
  • 114
  • 11
The effect of spherical shells of matter on the Schwarzschild black hole
Based on previous work we show how to join two Schwarzschild solutions, possibly with different masses, along null cylinders each representing a spherical shell of infalling or outgoing masslessExpand
  • 86
  • 2
Rigorous construction of planar diagram field theories in four dimensional Euclidean space
Asymptotically free quantum field theories with planar Feynman diagrams [such as SU(∞) gauge theory] are considered in 4 dimensional Euclidean space. It is shown that if all particles involved haveExpand
  • 9
  • 2
Canonical quantization of gravitating point particles in 2 + 1 dimensions
A finite number of gravitating point particles in 2+1 dimensions may close the universe they are in. A formalism previously introduced by the author using tesselated Cauchy surfaces is applied toExpand
  • 26
  • 1
  • PDF
Quantization of Point Particles in 2+1 Dimensional Gravity and Space-time Discreteness
By investigating the canonical commutation rules for gravitating quantized particles in a 2+1 dimensional world it is found that these particles live on a space-time lattice. The space-time latticeExpand
  • 55
  • 1
Relating the Quantum Mechanics of Discrete Systems to Standard Canonical Quantum Mechanics
Standard canonical quantum mechanics makes much use of operators whose spectra cover the set of real numbers, such as the coordinates of space, or the values of the momenta. Discrete quantumExpand
  • 7
  • 1
Studies of interfacial regions by sum-frequency generation with a free-electron laser
The use of a Free-Electron Laser (FEL) allows the study of (non)linear optical properties of materials over unsurpassed large spectral intervals. As an example, we report on the use of a FEL as theExpand
  • 8
Time, the Arrow of Time, and Quantum Mechanics
It is brought forward that viable theories of the physical world that have no variable at all that can play the role of time, do not exist; some notion of time is one of the very first ingredients aExpand
  • 5
  • PDF