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Conformal fixed point, Cosmological Constant and Quintessence
C. Wetterich
We connect a possible solution for the ``cosmological constant problem'' to the existence of a (postulated) conformal fixed point in a fundamental theory. The resulting cosmology l…
Universality of spontaneous chiral symmetry breaking in gauge theories
Holger Gies, Christof Wetterich
We investigate one-flavor QCD with an additional chiral scalar field. For a large domain in the space of coupling constants, this model belongs to the same universality class as QC…
Bosonic effective action for interacting fermions
Christof Wetterich
We compare different versions of a bosonic description for systems of interacting fermions, with particular emphasis on the free energy functional. The bosonic effective action mak…
Flow Equations without Mean Field Ambiguity
Joerg Jaeckel, Christof Wetterich
We compare different methods used for non-perturbative calculations in strongly interacting fermionic systems. Mean field theory often shows a basic ambiguity related to the possib…
Renormalization flow from UV to IR degrees of freedom
Holger Gies, Christof Wetterich
Within the framework of exact renormalization group flow equations, a scale-dependent transformation of the field variables provides for a continuous translation of UV to IR degree…
Quintessence and the cosmological constant
Michael Doran, Christof Wetterich
Quintessence -- the energy density of a slowly evolving scalar field -- may constitute a dynamical form of the homogeneous dark energy in the universe. We review the basic idea in…
Probing Quintessence with Time Variation of Couplings
C. Wetterich
Many models of quintessence predict a time variation of the fundamental constants as well as a composition-dependent gravity like long-range force mediated by the cosmon. We presen…