# From the microscopic to the macroscopic world: from nucleons to neutron stars

## TL;DR

This paper reviews how recent neutron star observations, especially gravitational waves, constrain nuclear interactions by connecting microscopic nucleon interactions to macroscopic neutron star properties.

## Contribution

It provides a comprehensive review of first-principles calculations of the equation of state of nuclear matter and their implications for neutron star observations.

## Key findings

- Constraints on nuclear interactions from gravitational wave data
- Correlation between microscopic models and neutron star properties
- Advances in first-principles calculations of nuclear matter

## Abstract

Recent observations of neutron-star properties, in particular the recent detection of gravitational waves emitted from binary neutron stars, GW 170817, open the way to put strong constraints on nuclear interactions. In this paper, we review the state of the art in calculating the equation of state of strongly interacting matter from first principle calculations starting from microscopic interactions among nucleons. We then review selected properties of neutron stars that can be directly compared with present and future observations.