Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2011-02-09
Phys.Rev.D83:114502,2011
Physics
High Energy Physics
High Energy Physics - Lattice
20 pages, 22 figures
Scientific paper
10.1103/PhysRevD.83.114502
We study the phases and phase transition lines of the finite temperature G(2) Higgs model. Our work is based on an efficient local hybrid Monte-Carlo algorithm which allows for accurate measurements of expectation values, histograms and susceptibilities. On smaller lattices we calculate the phase diagram in terms of the inverse gauge coupling $\beta$ and the hopping parameter $\kappa$. For $\kappa\to 0$ the model reduces to G(2) gluodynamics and for $\kappa\to\infty$ to SU(3) gluodynamics. In both limits the system shows a first order confinement-deconfinement transition. We show that the first order transitions at asymptotic values of the hopping parameter are almost joined by a line of first order transitions. A careful analysis reveals that there exists a small gap in the line where the first order transitions turn into continuous transitions or a cross-over region. For $\beta\to\infty$ the gauge degrees of freedom are frozen and one finds a nonlinear O(7) sigma model which exhibits a second order transition from a massive O(7)-symmetric to a massless O(6)-symmetric phase. The corresponding second order line for large $\beta$ remains second order for intermediate $\beta$ until it comes close to the gap between the two first order lines. Besides this second order line and the first order confinement-deconfinement transitions we find a line of monopole-driven bulk transitions which do not interfer with the confinement-deconfinment transitions.
Wellegehausen Björn H.
Wipf Andreas
Wozar Christian
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