A dynamical description of neutron star crusts
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description
A dynamical description of neutron star crusts. V. de la Mota , F. Sébille and Ph. Eudes. Crust: Exotic Shapes. at sub-nuclear densities: frustration. ρ ≤ 10 14 g/cm 3 T≈ 0.1 MeV. « Nuclear Pasta ». crust. spheres rods slabs cylindrical holes spherical holes. fluid. - PowerPoint PPT Presentation
Transcript of A dynamical description of neutron star crusts
fluid
ρ
0 ρ∞
a) spheresb) rodsc) slabsd) cylindrical
holese) spherical holes
« Nuclear Pasta »
crust
ρ ≤ 1014 g/cm3
T≈ 0.1MeV
Studying the behavior of matter at the crust:
interacting nucleons in a uniform electron background
: moving basis (Gabor wavelets)
= 0.145 fm-3 ½ neutrons q= - ½ protons
lattice calculation with Ewald summation technique
J=31.5 MeVc=20 MeV
★ K. Oyamatsu and K. Iida, Phys. Rev. C 75 (2007) 015801
★
FP B. Friedman et B.R. Pandharipande, Nucl. Phys. 361(1981) 501SKM H. Krivine et al, Nucl. Phys. A 336 (1980) 155Sly4 F. Douchin et al, Phys. Lett. B 435 (2000) 107
static properties of neutron matter static properties of neutron matter
neutron matter
L
SC cells 16O T=0
SCC lattice oxygen xp=0.1 <ρ>=0.0726fm- 3 L=23.1fm ρt=0.065fm-3
shapes ρt
embedded structures
ρt=0.05fm- 3 ρt=0.1fm- 3
t=210 fm/c
☐ G. Watanabe et al. Phys. Rev. C 69 (2004) 055805
the tracks of the initial configuration are washed out
SCC O cell <ρ>=0.06 fm-3 ρt=0.04 fm-3
xp=0.5
xp=0.2
the effects depend on the proton fraction value and on the symmetry of the lattice
Lattice perturbations
FCC O cell xp=0.2<ρ>=0.03 fm-3
Influence of the EoS
non perturbed O SCC lattice xp=0.2
stiffer force favours spherical & sponge-like structures,restrains cylinder & slabs.
