Radial oscillations of boson stars made of ultralight repulsive dark matter
arXiv:1904.07191 · doi:10.1016/j.nuclphysb.2020.115266
Abstract
We compute the lowest frequency radial oscillation modes of boson stars. It is assumed that the object is made of pseudo-Goldstone bosons subjected to a scalar potential that leads to a repulsive self-interaction force, and which is characterized by two unknown mass scales (mass of the particle) and (decay constant). First we integrate the Tolman-Oppenheimer-Volkoff equations for the hydrostatic equilibrium of the star, and then we solve the Sturm-Liouville boundary value problem for the perturbations using the shooting method. The effective potential that enters into the Schr{ö}dinger-like equation as well as several associated eigenfunctions are shown as well. Moreover, we found that the large frequency separation, i.e. the difference between consecutive modes, is proportional to the square root of the mass of the star and the cube of the mass scale defined by .
References added
References in corpus (19)
- Tidal Love numbers of neutron stars
- Dark Matter Self-interactions and Small Scale Structure
- Review of LHC Dark Matter Searches
- Dilute and dense axion stars
- Gravitational Stability of Boson Stars
- Phase transitions between dilute and dense axion stars
- Dark stars: gravitational and electromagnetic observables
- Gravitational effects of condensate dark matter on compact stellar objects
- Axion Stars and Fast Radio Bursts
- Natural Inflation: Consistency with Cosmic Microwave Background Observations of Planck and BICEP2
- Axion Stars in the Infrared Limit
- Radial oscillations of strange quark stars admixed with condensed dark matter
- Axion star collisions with Neutron stars and Fast Radio Bursts
- Axionic dark energy and a composite QCD axion
- Towards the use of asteroseismology to investigate the nature of dark matter
- A Radio Astronomy Search for Cold Dark Matter Axions
- TASI Lectures on Dark Matter
- Detectability of Small-Scale Dark Matter Clumps with Pulsar Timing Arrays
- Nearby stars as gravitational wave detectors