Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 9, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2019/09/061
Keywords
gravity; axions; massive stars
Funding
- European Union's H2020 ERC [DarkGRA-757480]
- Amaldi Research Center - MIUR program Dipartimento di Eccellenza [CUP: B81I18001170001]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
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We study novel solitonic solutions to Einstein-Klein-Gordon theory in the presence of a periodic scalar potential arising in models of axion-like particles. The potential depends on two parameters: the mass of the scalar field m(a) and the decay constant f(a); the standard case of the QCD axion is recovered when m(a) alpha 1/f(a). When f(a) -> infinity the solutions reduce to the standard case of mini boson stars supported by a massive free scalar field. As the energy scale f(a) of the scalar self-interactions decreases we unveil several novel features of the solution: new stability branches emerge at high density, giving rise to very compact, radially stable, boson stars. Some of the most compact configurations acquire a photon sphere. When f(a) is at the GUT scale, a boson star made of QCD axions can have a mass up to ten solar masses and would be more compact than a neutron star. Gravitational-wave searches for these exotic compact objects might provide indirect evidence for ultralight axion-like particles in a region not excluded by the black-hole superradiant instability.
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