5 papers
Fermionic sectors for the Kodama state
Stephon Alexander, Kristin Schleich, Donald M. Witt
Diffeomorphisms not connected to the identity can act nontrivially on the quantum state space for gravity. However, in stark contrast to the case of nonabelian Yang-Mills field the…
Effects of a cosmological constant on the X-ray fluorescence spectra of black hole accretion disks
Sergei Slobodov, Kristin Schleich, Donald M. Witt
We investigate the effects of cosmological constant on the characteristic peaks in the iron line profile in the black hole accretion disk X-ray spectrum. Our results show that for…
Topological Censorship
Kristin Schleich, Donald M. Witt
Classically, all topologies are allowed as solutions to the Einstein equations. However, one does not observe any topological structures on medium range distance scales, that is sc…
Numerical quantum gravity by dynamical triangulation
Kristin Schleich, Donald Witt
Recently an alternate technique for numerical quantum gravity, dynamical triangulation, has been developed. In this method, the geometry is varied by adding and subtracting equilat…
Toward a definition of chaos for general relativity
Donald Witt, Kristin Schleich
General relativity exhibits a unique feature not represented in standard examples of chaotic systems; it is a spacetime diffeomorphism invariant theory. Thus many characterizations…