Vector mesons in asymmetric nuclear matter |
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| Institution: | 1. Metabolic Disease Research Center, Zhengzhou University Affiliated Zhengzhou Central Hospital, Zhengzhou, 450007, China;2. Research Center for Basic Medicine, Academy of Medical Sciences, Zhengzhou University, Zhengzhou, 450052, China;3. Key laboratory of Zhengzhou Obesity and Metabolic Diseases, Zhengzhou, Zhengzhou, 450007, China;1. College of Education, Health and Human Performance, Fairmont State University, Fairmont, WV, USA;2. College of Applied Human Science, West Virginia University, Morgantown, WV, USA;3. Programa de Pós-graduação em Ciências Aplicadas à Saúde, Universidade Federal de Jataí, Jataí, Brazil;4. College of Liberal Arts, Community Health Fairmont State University, Fairmont, WV, USA;5. Department of Health Promotion and Development, School of Nursing, University of Pittsburgh, Pittsburgh, PA, USA;1. ESIC Business & Marketing School, Barcelona, Spain;2. ESIC Business & Marketing School, ESIC University, Barcelona, Spain;1. Student Research Committee, Gerash University of Medical Sciences, Gerash, Iran;2. Department of Biostatistics, School of Health, Kermanshah University of Medical Sciences, Kermanshah, Iran;3. Department of Operating Room, Nahavand School of Allied Medical Sciences, Hamadan University of Medical Sciences, Hamadan, Iran;4. Cellular and Molecular Research Center, Gerash University of Medical Sciences, Gerash, Iran;5. Department of Biology, Faculty of Science, University Putra Malaysia, Serdang, Selangor, Malaysia |
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| Abstract: | The propagation of a vector meson (? and ω) in dense asymmetric nuclear matter (with the number density of protons and neutrons different) is studied. Of particular interest is the density dependence of the vector meson masses, as also their variation with the asymmetry parameter, mass splitting among the ? isospin multiplets and the change of the form of the ? meson self-energy or the polarization tensor (IIμν) when the p ? n symmetry is broken. Contributions of both the Fermi sea and Dirac vacuum have been considered. It is shown that while the density dependent dressing of the vector meson propagator lifts the dispersion characteristics into the region of instability, the Dirac vacuum on the other hand contributes with opposite sign, thereby enhancing the possibility of stable collective modes even for higher values of vector meson momenta. The role of tensor coupling on the dispersion characteristics is also presented. |
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