Inhomogeneous condensates in dilute nuclear matter and BCS-BEC crossovers

2nd International Symposium on the Modern Physics of Compact Stars and Relativistic Gravity

物理学;天文学

Stein, Martin^1 ; Sedrakian, Armen^1 ; Huang, Xu-Guang^2 ; Clark, John W.^3,5 ; Röpke, Gerd^4

Institute for Theoretical Physics, J. W. Goethe-University, D-60438 Frankfurt-Main, Germany^1

Physics Department, Center for Particle Physics and Field Theory, Fudan University, Shanghai 200433, China^2

Department of Physics, McDonnell Center for the Space Sciences, Washington University, St. Louis, MO 63130, United States^3

Institut für Physik, Universität Rostock, Universitätsplatz 3, D-18051 Rostock, Germany^4

Center for Mathematical Sciences, University of Madeira, Funchal, Portugal^5

关键词: BCS-BEC crossover;    Density distributions;    Isospin asymmetries;    Nuclear matters;    Recent progress;    Second moments;    Superfluid phasis;    Weak couplings;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/496/1/012008/pdf
DOI  :  10.1088/1742-6596/496/1/012008

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

We report on recent progress in understanding pairing phenomena in low-density nuclear matter at small and moderate isospin asymmetry. A rich phase diagram has been found comprising various superfluid phases that include a homogeneous and phase-separated BEC phase of deuterons at low density and a homogeneous BCS phase, an inhomogeneous LOFF phase, and a phase-separated BCS phase at higher densities. The transition from the BEC phases to the BCS phases is characterized in terms of the evolution, from strong to weak coupling, of the condensate wavefunction and the second moment of its density distribution in r-space. We briefly discuss approaches to higher-order clustering in low-density nuclear matter.