Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-05-15
Nucl.Phys.B757:259-279,2006
Physics
High Energy Physics
High Energy Physics - Theory
16 pages, 3 figures, 1 table. Version to appear in Nucl Phys B
Scientific paper
10.1016/j.nuclphysb.2006.09.011
We formulate the low energy limit of QCD like partition functions with bosonic quarks at nonzero chemical potential. The partition functions are evaluated in the parameter domain that is dominated by the zero momentum modes of the Goldstone fields. We find that partition functions with bosonic quarks differ structurally from partition functions with fermionic quarks. Contrary to the theory with one fermionic flavor, where the partition function in this domain does not depend on the chemical potential, a phase transition takes place in the theory with one bosonic flavor when the chemical potential is equal to $m_\pi/2$. For a pair of conjugate bosonic flavors the partition function shows no phase transition, whereas the fermionic counterpart has a phase transition at $\mu = m_\pi/2$. The difference between the bosonic theories and the fermionic ones originates from the convergence requirements of bosonic integrals resulting in a noncompact Goldstone manifold and a covariant derivative with the commutator replaced by an anti-commutator.
Splittorff Kim
Verbaarschot Jacobus J. M.
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