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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…
Three-body loss in lithium from functional renormalization
R. Schmidt, S. Floerchinger, C. Wetterich
We use functional integral methods for an estimate of the three-body loss in a three-component Li ultracold atom gas. We advocate a simple picture where the loss proceeds by th…
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…
Quantum entanglement and interference from classical statistics
C. Wetterich
Quantum mechanics for a four-state-system is derived from classical statistics. Entanglement, interference, the difference between identical fermions or bosons and the unitary time…
Functional renormalization for trion formation in ultracold fermion gases
S. Floerchinger, R. Schmidt, S. Moroz +1
The energy spectrum for three species of identical fermionic atoms close to a Feshbach resonance is computed by use of a nonperturbative flow equation. Already a simple truncation…
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…
Particle-hole fluctuations in the BCS-BEC Crossover
S. Floerchinger, M. Scherer, S. Diehl +1
The effect of particle-hole fluctuations for the BCS-BEC crossover is investigated by use of functional renormalization. We compute the critical temperature for the whole range in…
Superfluid Bose gas in two dimensions
S. Floerchinger, C. Wetterich
We investigate Bose-Einstein condensation for ultracold bosonic atoms in two-dimensional systems. The functional renormalization group for the average action allows us to follow th…
Cosmon Lumps and Horizonless Black Holes
Timm Krueger, Matthias Neubert, Christof Wetterich
We investigate non-linear, spherically symmetric solutions to the coupled system of a quintessence field and Einstein gravity. In the presence of a scalar potential, we find regula…
Functional renormalization for Bose-Einstein Condensation
S. Floerchinger, C. Wetterich
We investigate Bose-Einstein condensation for interacting bosons at zero and nonzero temperature. Functional renormalization provides us with a consistent method to compute the eff…
Generation of d-wave coupling in the two-dimensional Hubbard model from functional renormalization
H. C. Krahl, J. A. Müller, C. Wetterich
Within the two-dimensional repulsive t-t'-Hubbard model, an attractive coupling in the d-wave pairing channel is induced by antiferromagnetic fluctuations. We investigate this coup…