74 citations · 684 across the 46 of their papers we have counts for
12 papers · 1 filter
Post-Newtonian Generation of Gravitational Waves in a Theory of Gravity with Torsion
M. Schweizer, N. Straumann, A. Wipf
We adapt the post-Newtonian gravitational-radiation methods developed within general relativity by Epstein and Wagoner to the gravitation theory with torsion, recently proposed by…
Geometry of the Hopf Bundle and spin-weighted Harmonics
Norbert Straumann
We demonstrate that it is conceptually and computationally favorable to regard spin-weighted spherical harmonics as vector valued functions on the total space of the Hopf b…
Problems with Modified Theories of Gravity, as Alternatives to Dark Energy
Norbert Straumann
In this contribution to the conference "Beyond Einstein: Historical Perspectives on Geometry, Gravitation and Cosmology in the Twentieth Century", we give a critical status report…
Proof of a decomposition theorem for symmetric tensors on spaces with constant curvature
Norbert Straumann
In cosmological perturbation theory a first major step consists in the decomposition of the various perturbation amplitudes into scalar, vector and tensor perturbations, which mutu…
Dark Energy
Norbert Straumann
After some remarks about the history and the mystery of the vacuum energy I shall review the current evidence for a cosmologically significant nearly homogeneous exotic energy dens…
The history of the cosmological constant problem
Norbert Straumann
The interesting early history of the cosmological term is reviewed, beginning with its introduction by Einstein in 1917 and ending with two papers of Zel'dovich, shortly before the…
On Pauli's invention of non-abelian Kaluza-Klein Theory in 1953
N. Straumann
There are documents which show that Wolfgang Pauli developed in 1953 the first consistent generalization of the five-dimensional theory of Kaluza, Klein, Fock and others to a highe…
Internal structure of Einstein-Yang-Mills-Dilaton black holes
O. Sarbach, N. Straumann, M. S. Volkov
We study the interior structure of the Einstein-Yang-Mills-Dilaton black holes as a function of the dilaton coupling constant . For the solutions have no inte…
On Newton-Cartan Cosmology
Christian Rueede, Norbert Straumann
After a brief summary of the Newton-Cartan theory in a form which emphasizes its close analogy to general relativity, we illustrate the theory with selective applications in cosmol…
Asymptotic Behavior of the Einstein-Yang-Mills-Dilaton System for a Closed Friedmann-Lemaitre Universe
Reto Eggenschwiler, David Scialom, Norbert Straumann
We study the coupled Einstein-Yang-Mills-Dilaton (EYMD) equations for a Fried\-mann-Le\-mai\-tre universe with constant curvature . Our detailed analysis is restricted to the…
Instability Proof for Einstein-Yang-Mills Solitons and Black Holes with Arbitrary Gauge Groups
Othmar Brodbeck, Norbert Straumann
We prove that static, spherically symmetric, asymptotically flat soliton and black hole solutions of the Einstein-Yang-Mills equations are unstable for arbitrary gauge groups, at l…
Instability Proof for Einstein-Yang-Mills Solitons with Arbitrary Gauge Groups
Othmar Brodbeck, Norbert Straumann
We prove that static, spherically symmetric, asymptotically flat, regular solutions of the Einstein-Yang-Mills equations are unstable for arbitrary gauge groups, at least for the `…