Strongly interacting quark-gluon plasma, and the critical behavior of QCD at imaginary {mu}
- Dipartimento di Fisica dell'Universita di Genova and INFN, I-16146, Genova (Italy)
- Dipartimento di Fisica dell'Universita di Parma and INFN, I-43100, Parma (Italy)
- INFN-Laboratori Nazionali di Frascati, I-00044, Frascati (Italy)
We explore the highly nonperturbative hot region of the QCD phase diagram close to T{sub c} by use of an imaginary chemical potential {mu} which avoids the sign problem. The simulations use four flavors of staggered fermions and are carried out on a 16{sup 3}x4 lattice. The number density and the quark number susceptibility are consistent with a critical behavior associated with the transition line in the negative {mu}{sup 2} half-plane. We compare the analytic continuation of these results with various phenomenological models, none of which provides a satisfactory description of data, a failure on which we make some comments. These results complement and extend the information obtained via the analysis of the susceptibilities evaluated at zero {mu}, yielding a simple description of the candidate strongly interacting quark-gluon plasma phase. As a byproduct of our analysis we investigate the Polyakov loop and its hermitian conjugate. Our data offer vivid evidence of the importance of the complex nature of the functional integral measure, which results in L({mu}){ne}L({mu}) for a real chemical potential {mu}.
- OSTI ID:
- 21023939
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 76, Issue 11; Other Information: DOI: 10.1103/PhysRevD.76.114509; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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