# nEoS: Neutron Star Equation of State from hadron physics alone

## TL;DR

This paper provides a set of neutron star equations of state derived solely from hadron physics principles, enabling tests of gravity theories without relying on observational data or General Relativity.

## Contribution

It offers publicly available EoS tables based on hadron physics, free from observational feedback, to test gravity theories with neutron star data.

## Key findings

- EoS constrained by hadron physics and fundamental principles
- Applicable for testing gravity theories independently of observations
- Combines chiral potentials and pQCD results for a broad density range

## Abstract

We contribute a publicly available set of tables and code to provide Equations of State (EoS) for matter at neutron star densities. Our EoSes are constrained only by input from hadron physics and fundamental principles, without feedback from neutron star observations, and so without relying on General Relativity. They can therefore be used to test General Relativity itself, as well as modified gravity theories, with neutron star observables, without logical circularity. We have adapted state of the art results from NN chiral potentials for the low--density limit, pQCD results for the asymptotically high-density EoS, and use monotonicity and causality as the only restrictions for intermediate densities, for the EoS sets to remain as model-independent as is feasible today.