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Considering contact forces during the formation of planetesimals by gravitational collapse: mutual orbits, spin states, and shapes
Jackson T. Barnes, Stephen R. Schwartz, Seth A. Jacobson
https://arxiv.org/abs/2507.16739

Considering contact forces during the formation of planetesimals by gravitational collapse: mutual orbits, spin states, and shapes
In this work, we apply a soft-sphere discrete element method (SSDEM) within the PKDGRAV N-body integrator to investigate the formation of planetesimal systems through the gravitational collapse of clouds of super-particles. Previously published numerical models have demonstrated that the gravitational collapse of pebble clouds is an efficient pathway to produce binary planetesimal systems. However, such investigations were limited by their use of a perfect-merger and inflated-radii super-partic…

Properties and microscopic structures of dense stellar matter in RMF models
Jia-Xing Niu, Hao Sun, Cheng-Jun Xia, Toshiki Maruyama
https://arxiv.org/abs/2506.11492

Properties and microscopic structures of dense stellar matter in RMF models
Data tables on the equation of state (EOS) and microscopic structures for cold dense stellar matter with proton fractions $Y_p =0.01$-$0.65$ and baryon number densities $n_\text{b}=10^{-8}$-$2 \ \mathrm{fm}^{-3}$ are obtained adopting 13 different relativistic density functionals, i.e., NL3, PK1, PK1r, GM1, MTVTC, DD-LZ1, PKDD, DD-ME2, TW99, DD-MEX, DD-MEX1, DD-MEX2, and DD-MEY. The EOSs of dense stellar matter inside neutron stars with baryon number densities $n_\text{b}=7.6\times 10^{-11}$-$2…

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