49 citations · 63 across the 9 of their papers we have counts for
6 papers · 1 filter
Cosmological Phase Transitions
Norbert Straumann
In this lecture at a school for condensed matter physicists, I begin with basic concepts and tools for investigating phase transitions in quantum field theory. The very different r…
On the Cosmological Constant Problems and the Astronomical Evidence for a Homogeneous Energy Density with Negative Pressure
Norbert Straumann
In this article the cosmological constant problems, as well as the astronomical evidence for a cosmologically significant homogeneous exotic energy density with negative pressure (…
On the mystery of the cosmic vacuum energy density
Norbert Straumann
After a short history of the -term it is explained why the (effective) cosmological constant is expected to obtain contributions from short-distance physics, corresponding to an…
The mystery of cosmological vacuum energy density and the accelerated expansion of the universe
Domenico Giulini, Norbert Straumann
The principles of General Relativity allow for a non-vanishing cosmological constant, which can possibly be interpreted at least partially in terms of quantum-fluctuations of matte…
Reflections on Gravity
Norbert Straumann
A pedagogical description of a simple ungeometrical approach to General Relativity is given, which follows the pattern of well understood field theories, such as electrodynamics. T…
Complex Formulation of Lensing Theory and Applications
Norbert Straumann
The elegance and usefulness of a complex formulation of the basic lensing equations is demonstrated with a number of applications. Using standard tools of complex function theory,…