Conventional and Unconventional Pairing and Condensates in Dilute Nuclear Matter

18th International Conference on Recent Progress in Many-Body Theories

Clark, John W.^1,2 ; Sedrakian, Armen^3 ; Stein, Martin^3 ; Huang, Xu-Guang^4 ; Khodel, Victor A.^1,5 ; Shaginyan, Vasily R.^6 ; Zverev, Mikhail V.^5,7

Department of Physics, McDonnell Center for the Space Sciences, Washington University, St. Louis

MO

63130, United States^1

Center for Mathematical Sciences, University of Madeira, Funchal

9000-390, Portugal^2

Institute for Theoretical Physics, J. W. Goethe-University, Frankfurt am Main

D-60438, Germany^3

Physics Department, Center for Particle Physics and Field Theory, Fudan University, Shanghai

200433, China^4

National Research Centre, Kurchatov Institute, Moscow

123182, Russia^5

Petersburg Nuclear Physics Institute, NRC Kurchatov Institute, Gatchina

188300, Russia^6

Moscow Institute of Physics and Technology, Dolgoprudny, Moscow District

141700, Russia^7

关键词: Isospin asymmetries;    Many-body techniques;    Nuclear matters;    Occupation numbers;    Recent progress;    Strong coupling;    Superfluid phasis;    Translational invariance;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/702/1/012012/pdf
DOI  :  10.1088/1742-6596/702/1/012012

来源: IOP

【 摘 要 】

This contribution will survey recent progress toward an understanding of diverse pairing phenomena in dilute nuclear matter at small and moderate isospin asymmetry, with results of potential relevance to supernova envelopes and proto-neutron stars. Application of ab initio many-body techniques has revealed a rich array of temperature-density phase diagrams, indexed by isospin asymmetry, which feature both conventional and unconventional superfluid phases. At low density there exist a homogeneous translationally invariant BCS phase, a homogeneous LOFF phase violating translational invariance, and an inhomogeneous translationally invariant phase-separated BCS phase. The transition from the BCS to the BEC phases is characterized in terms of the evolution, from weak to strong coupling, of the pairing gap, condensate wave function, and quasiparticle occupation numbers and spectra. Additionally, a schematic formal analysis of pairing in neutron matter at low to moderate densities is presented that establishes conditions for the emergence of both conventional and unconventional pairing solutions and encompasses the possibility of dineutron formation.