کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10726279 | 1035832 | 2012 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Chiral nuclear thermodynamics
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک هسته ای و انرژی بالا
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چکیده انگلیسی
We calculate the equation of state of nuclear matter for arbitrary isospin-asymmetry up to three loop order in the free energy density in the framework of in-medium chiral perturbation theory. In our approach 1Ï- and 2Ï-exchange dynamics with the inclusion of the Î-isobar excitation as an explicit degree of freedom, corresponding to the long- and intermediate-range correlations, are treated explicitly. Few contact terms fixed to reproduce selected known properties of nuclear matter encode the short-distance physics. Two-body as well as three-body forces are systematically included. We find a critical temperature of about 15Â MeV for symmetric nuclear matter. We investigate the dependence of the liquid-gas first-order phase transition on isospin-asymmetry. In the same chiral framework we calculate the chiral condensate of isospin-symmetric nuclear matter at finite temperatures. The contribution of the Î-isobar excitation is essential for stabilizing the condensate. As a result, we find no indication of a chiral phase transition for densities Ïâ²2Ï0 and at temperatures Tâ²100Â MeV.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Progress in Particle and Nuclear Physics - Volume 67, Issue 2, April 2012, Pages 317-321
Journal: Progress in Particle and Nuclear Physics - Volume 67, Issue 2, April 2012, Pages 317-321
نویسندگان
S. Fiorilla, N. Kaiser, W. Weise,