TL;DR
This paper estimates the mass and radius of axion stars by solving coupled Einstein-Klein-Gordon equations, suggesting they could be asteroid-mass objects with centimeter-scale radii, advancing understanding of axion compact objects.
Contribution
It provides a detailed estimation of axion star properties using quantum field theory and general relativity, considering higher-order potential terms.
Findings
Axion stars have masses around asteroids.
Their radii are a few centimeters.
The study incorporates up to sixth-order potential terms.
Abstract
In this work we estimate the radius and the mass of a self-gravitating system made of axions. The quantum axion field satisfies the Klein-Gordon equation in a curved space-time and the metric components of this space-time are solutions to the Einstein equations with a source term given by the vacuum expectation value of the energy-momentum operator constructed from the axion field. As a first step towards an axion star we consider the up to the sixth term in the axion potential expansion. We found that axion stars would have masses of the order of asteroids and radius of the order of few centimeters.
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