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Title: Equation of state of neutron-rich matter in d -dimensions

Journal Article · · Annals of Physics

Nuclear systems under constraints, with high degrees of symmetries and/or collectivities may be considered as moving effectively in spaces with reduced spatial dimensions. We first derive analytical expressions for the nucleon specific energy E0 (ρ), pressure P0 (ρ), incompressibility coefficient K0 (ρ) and skewness coefficient J0 (ρ) of symmetric nucleonic matter (SNM), the quadratic symmetry energy Esym (ρ), its slope parameter L(ρ) and curvature coefficient Ksym (ρ) as well as the fourth-order symmetry energy Esym,4 (ρ) of neutron-rich matter in general d spatial dimensions (abbreviated as "dD") in terms of the isoscalar and isovector parts of the isospin-dependent single-nucleon potential according to the generalized Hugenholtz-Van Hove (HVH) theorem. The equation of state (EOS) of nuclear matter in dD can be linked to that in the conventional 3-dimensional (3D) space by the ε-expansion which is a perturbative approach successfully used previously in treating second-order phase transitions and related critical phenomena and more recently in studying the EOS of cold atoms. The ε-expansion of nuclear EOS in dD based on a reference dimension df = d – ε is shown to be effective with –1 ≲ ε ≲ 1 starting from 1 ≲ df ≲ 3 in comparison with the exact expressions derived using the HVH theorem. Moreover, the EOS of SNM (with/without considering its potential part) is found to be reduced (enhanced) in lower (higher) dimensions, indicating in particular that the many-nucleon system tends to be deeper bounded but saturate at higher densities in spaces with lower dimensions. Here, the links between the EOSs in 3D and dD spaces from the ε-expansion provide new perspectives to the EOS of neutron-rich matter.

Research Organization:
Texas A & M Univ., Commerce, TX (United States); Texas A&M University-Commerce, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0013702; SC0009971
OSTI ID:
1882659
Alternate ID(s):
OSTI ID: 1961232; OSTI ID: 2280884
Journal Information:
Annals of Physics, Vol. 444; ISSN 0003-4916
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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