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Gluon condensates and effective gluon mass
Jan Horak, Friederike Ihssen, Joannis Papavassiliou +3
Lattice simulations along with studies in continuum QCD indicate that non-perturbative quantum fluctuations lead to an infrared regularisation of the gluon propagator in covariant…
Neutrino masses, vacuum stability and quantum gravity prediction for the mass of the top quark
Guillem Domènech, Mark Goodsell, Christof Wetterich
A general prediction from asymptotically safe quantum gravity is the approximate vanishing of all quartic scalar couplings at the UV fixed point beyond the Planck scale. A vanishin…
Isotropization from Color Field Condensate in heavy ion collisions
Stefan Floerchinger, Christof Wetterich
The expanding fireball shortly after a heavy ion collision may be qualitatively described by a condensate of color fields or gluons which is analogous to Bose-Einstein-condensation…
Where to look for solving the gauge hierarchy problem?
C. Wetterich
A mass of the Higgs boson close to 126 GeV may give a hint that the standard model of particle physics is valid up to the Planck scale. We discuss perspectives for the solution of…
Theoretical constraints on new generations with and without Quarks or Neutrinos
Alexander Knochel, Christof Wetterich
We consider large classes of chiral extensions of the Standard Model, including new quark generations that do not involve additional neutrinos as well as lepton generations without…
Asymptotically free four-fermion interactions and electroweak symmetry breaking
Jan-Markus Schwindt, Christof Wetterich
We investigate the fermions of the standard model without a Higgs scalar. Instead, we consider a non-local four-quark interaction in the tensor channel which is characterized by a…
Competing bounds on the present-day time variation of fundamental constants
Thomas Dent, Steffen Stern, Christof Wetterich
We compare the sensitivity of a recent bound on time variation of the fine structure constant from optical clocks with bounds on time varying fundamental constants from atomic cloc…
Time variation of fundamental couplings and dynamical dark energy
Thomas Dent, Steffen Stern, Christof Wetterich
Scalar field dynamics may give rise to a nonzero cosmological variation of fundamental constants. Within different scenarios based on the unification of gauge couplings, the variou…
Unifying cosmological and recent time variations of fundamental couplings
Thomas Dent, Steffen Stern, Christof Wetterich
A number of positive and null results on the time variation of fundamental constants have been reported. It is difficult to judge whether or not these claims are mutually consisten…
Chiral tensor fields and spontaneous breaking of Lorentz symmetry
Jan-Markus Schwindt, Christof Wetterich
Antisymmetric tensor fields interacting with quarks and leptons have been proposed as a possible solution to the gauge hierarchy problem. We compute the one-loop beta function for…
Light fermion masses and chiral freedom
Christof Wetterich
Within the scenario of chiral freedom we compute the quark and lepton masses of the first two generations in terms of their chiral couplings. This allows us to make a rough estimat…
Do Instantons Like a Colorful Background?
Holger Gies, Joerg Jaeckel, Jan M. Pawlowski +1
We investigate chiral symmetry breaking and color symmetry breaking in QCD. The effective potential of the corresponding scalar condensates is discussed in the presence of non-pert…
Chiral freedom and electroweak symmetry breaking
C. Wetterich
Antisymmetric tensor fields with chiral couplings to quarks and leptons may induce spontaneous electroweak symmetry breaking in a model without a ``fundamental'' Higgs scalar. No m…
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…
Higgs picture of the QCD-vacuum
C. Wetterich
The functional integral for QCD is reformulated by introducing explicitly an integration over the fluctuations of composite quark-antiquark bound states. Chiral symmetry breaking b…
Towards a renormalizable standard model without fundamental Higgs scalar
Holger Gies, Joerg Jaeckel, Christof Wetterich
We investigate the possibility of constructing a renormalizable standard model with purely fermionic matter content. The Higgs scalar is replaced by point-like fermionic self-inter…
First Order Chiral Phase Transition from a Six-fermion ''Instanton''-Interaction
Joerg Jaeckel, Christof Wetterich
We compute the first order chiral phase transition for an instanton motivated quark model with a local six-quark interaction. In order to compare different solutions of the gap equ…
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…
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…
Cosmon dark matter?
C. Wetterich
We investigate if the fluctuations of the scalar field mediating quintessence -- the cosmon -- can play an important role in cosmology. Small fluctuations with short wavelength beh…
Phase transition between three- and two-flavor QCD?
C. Wetterich
We explore the possibility that QCD may undergo a phase transition as a function of the strange quark mass. This would hint towards models with ``spontaneous color symmetry breakin…
Connection between Chiral Symmetry Restoration and Deconfinement
Christof Wetterich
We propose a simple explanation for the connection between chiral symmetry restoration and deconfinement in QCD at high temperature. In the Higgs description of the QCD vacuum both…
Evolution equations for the effective four-quark interactions in QCD
Enrico Meggiolaro, Christof Wetterich
A nonperturbative renormalization group equation describes how the momentum dependent four-quark vertex depends on an infrared cutoff. We find a quasilocal one-particle irreducible…