Some selected publications
Abstract | |
Non-perturbative numerical lattice studies of the Higgs-Yukawa sector of the standard model with exact chiral symmetry are reviewed. In particular, we discuss bounds on the Higgs boson mass at the standard model top quark mass, and in the presence of heavy fermions. We present a comprehensive study of the phase structure of the theory at weak and very strong values of the Yukawa coupling as well as at non-zero temperature. |
Abstract | |
We discuss the non-thermal phase structure of a chirally invariant Higgs-Yukawa model on the lattice in the presence of a higher dimensional ΦΦ6-term. For the exploration of the phase diagram we use analytical, lattice perturbative calculations of the constraint effectice potential as well as numerical simulations. We also present first results of the effects of the Φ6-term on the lower Higgs boson mass bounds. |
These have been our works about Higgs boson mass bounds | |
We have computed the lower and upper Higgs boson mass bounds fully non-perturbatively in the Higgs-Yukawa sector of the standard model. In case, the Higgs boson is found, these bounds can serve to determine the energy scale up to which the standard model is valid. | |
Lattice Conference Plenary Talk |
Content | |
This has been a review of the finite temperature electroweak phase transition. The graph shows that there is a only crossover for Higgs boson masses larger than about 80GeV. Therefore, the baryon asymmetry of the universe cannot be explained within the standard model. Also, the universe did not undergo any kind of electroweak (nor QCD) phase transition in its evolution, a fact, I find most remarkable, see this paper. | |
my Ph.D. work |
Content | |
The four-dimensional 0(4) Phi**4 scalar theory is investigated in the broken phase at different values of the quartic coupling lampda. The scalar mass, the field expectation value and the wave function renormalization constant are calculated. We demonstrate the lambda dependence of the ratio the Higgs boson mass to the renormalized vacuum expectation value estimate its upper bound to be around 2.7(1 ). | |
first publication ever |
Content | |
We describe a rich phase structure observed in Monte Carlo simulations of the d = 4 U(1) gauge-Higgs system on lattices up to size 8**4. The charge-one Higgs field has a dynamical radial degree of freedom. The phase transition between the Coulomb and the Higgs phases is of first order for small values of the quartic coupling lambda and weakens when either lambda or the inverse gauge field coupling beta increase. The confinement-Higgs transition approaches with decreasing lambda the two frustrations phases found for beta < -1 and might be analogous to a spin-glass transition. | |