9,284 research outputs found
Holographic three flavor baryon in the Witten-Sakai-Sugimoto model with the D0-D4 background
With the construction of the Witten-Sakai-Sugimoto model in the D0-D4
background, we systematically investigate the holographic baryon spectrum in
the case of three flavors. The background geometry in this model is
holographically dual to Yang-Mills theory in large
limit involving an excited state with a nonzero angle or glue
condensate , which is proportional to the charge density of
the smeared D0-branes through a parameter or . The
classical solution of baryon in this model can be modified by embedding the
Belavin-Polyakov-Schwarz-Tyupkin (BPST) instanton and we carry out the
quantization of the collective modes with this solution. Then we extend the
analysis to include the heavy flavor and find that the heavy meson is always
bound in the form of the zero mode of the flavor instanton in strong coupling
limit. The mass spectrum of heavy-light baryons in the situation with single-
and double-heavy baryon is derived by solving the eigen equation of the
quantized collective Hamiltonian. Afterwards we obtain that the constraint of
stable baryon states has to be and the difference in the baryon
spectrum becomes smaller as the D0 charge increases. It indicates that quarks
or mesons can not form stable baryons if the angle or glue condensate
is sufficiently large. Our work is an extension of the previous study of this
model and also agrees with those conclusions.Comment: 35 pages, 2 figures, 1 table, this version includes the
acknowledgement and some revision
Effects of Neutron-Proton Short-Range Correlation on the Equation of State of Dense Neutron-Rich Nucleonic Matter
The strongly isospin-dependent tensor force leads to short-range correlations
(SRC) between neutron-proton (deuteron-like) pairs much stronger than those
between proton-proton and neutron-neutron pairs. As a result of the short-range
correlations, the single-nucleon momentum distribution develops a high-momentum
tail above the Fermi surface. Because of the strongly isospin-dependent
short-range correlations, in neutron-rich matter a higher fraction of protons
will be depleted from its Fermi sea and populate above the Fermi surface
compared to neutrons. This isospin-dependent nucleon momentum distribution may
have effects on: (1) nucleon spectroscopic factors of rare isotopes, (2) the
equation of state especially the density dependence of nuclear symmetry energy,
(3) the coexistence of a proton-skin in momentum space and a neutron-skin in
coordinate space (i.e., protons move much faster than neutrons near the surface
of heavy nuclei). In this talk, we discuss these features and their possible
experimental manifestations. As an example, SRC effects on the nuclear symmetry
energy are discussed in detail using a modified Gogny-Hartree-Fock (GHF) energy
density functional (EDF) encapsulating the SRC-induced high momentum tail (HMT)
in the single-nucleon momentum distribution
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