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The cosmological constant problem in codimension-two brane models
Jan-Markus Schwindt, Christof Wetterich
We discuss the possibility of a dynamical solution to the cosmological constant problem in the contaxt of six-dimensional Einstein-Maxwell theory. A definite answer requires an und…
Observational constraints on the dark energy density evolution
Michael Doran, Khamphee Karwan, Christof Wetterich
We constrain the evolution of the dark energy density from Cosmic Microwave Background, Large Scale Structure and Supernovae Ia measurements. While Supernovae Ia are most sensitive…
Non-linear Structure Formation in Cosmologies with Early Dark Energy
Matthias Bartelmann, Michael Doran, Christof Wetterich
We argue that a few per cent of "Early Dark Energy" can be detected by the statistics of nonlinear structures. The presence of Dark Energy during linear structure formation is natu…
Chiral freedom and the scale of weak interactions
C. Wetterich
A second rank antisymmetric tensor field is proposed as an alternative to the Higgs scalar. No mass term is allowed by the symmetries. At the scale where the asymptotically free ch…
Universality in Phase Transitions for Ultracold Fermionic Atoms
S. Diehl, C. Wetterich
We describe the gas of ultracold fermionic atoms by a functional integral for atom and molecule fields. The crossover from Bose-Einstein condensation (BEC) to BCS-type superfluidit…
Dark energy cosmologies for codimension-two branes
Jan-Markus Schwindt, Christof Wetterich
A six-dimensional universe with two branes in the "football-shaped" geometry leads to an almost realistic cosmology. We describe a family of exact solutions with time dependent cha…