Multi-pomeron repulsion and the Neutron-star mass
Y. Yamamoto, T. Furumoto, N. Yasutake, and TH.A. Rijken
TL;DR
This paper introduces a multi-pomeron exchange potential to model three-body repulsion in neutron-star matter, leading to an equation of state that predicts neutron-star masses exceeding observed values.
Contribution
It proposes a universal multi-pomeron exchange potential for three- and four-baryon interactions, and demonstrates its impact on neutron-star mass predictions.
Findings
Maximum neutron-star mass exceeds 1.97 solar masses
The MPP model fits nucleus-nucleus scattering data
The EoS includes multi-pomeron repulsion effects
Abstract
A multi-pomeron exchange potential (MPP) is proposed as a model for the three-body repulsion indicated in neutron-star matter, which works universally among three- and four-baryons. Its strength is determined by analyzing the nucleus-nucleus scattering with the G-matrix folding model. The EoS in neutron matter is obtained including the MPP contribution. The neutron-star mass is calculated by solving the TOV equation. The maximum mass is obtained to be larger than the observed one on the basis of the experimental data.
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