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19 papers · 1 filter
Gravity-induced birefringence within the framework of Poincare gauge theory
Oliver Preuss, Sami K. Solanki, M. P. Haugan +1
Gauge theories of gravity provide an elegant and promising extension of general relativity. In this paper we show that the Poincaré gauge theory exhibits gravity-induced birefringe…
Gravitational Billiards, Dualities and Hidden Symmetries
H. Nicolai
The purpose of this article is to highlight the fascinating, but only very incompletely understood relation between Einstein's theory and its generalizations on the one hand, and t…
Elements of Loop Quantum Cosmology
Martin Bojowald
The expansion of our universe, when followed backward in time, implies that it emerged from a phase of huge density, the big bang. These stages are so extreme that classical genera…
Asymptotic Properties of Difference Equations for Isotropic Loop Quantum Cosmology
Martin Bojowald, Adam Rej
In loop quantum cosmology, a difference equation for the wave function describes the evolution of a universe model. This is different from the differential equations that arise in…
Algebraic expansions for curvature coupled scalar field models
Roger Bieli
A late time asymptotic perturbative analysis of curvature coupled complex scalar field models with accelerated cosmological expansion is carried out on the level of formal power se…
The Early Universe in Loop Quantum Cosmology
Martin Bojowald
Loop quantum cosmology applies techniques derived for a background independent quantization of general relativity to cosmological situations and draws conclusions for the very earl…