Rotating hybrid axion-miniboson stars

Abstract

Abstract We construct rotating hybrid axion-miniboson stars (RHABSs), which are asymptotically flat, stationary, axially symmetric solutions of (3+1)-dimensional Einstein–Klein–Gordon theory. RHABSs consist of an axion field (ground state) and a free complex scalar field (first excited state). The solutions of RHABSs have two types of nodes, including $$^1S^2S$$ 1 S 2 S state and $$^1S^2P$$ 1 S 2 P state. For different axion decay constants $$f_a$$ f a , we present the mass M of RHABSs as a function of the synchronized frequency, as well as the nonsynchronized frequency, and explore the mass M versus the angular momentum J for the synchronized frequency and the nonsynchronized frequency, respectively. Furthermore, we study the effect of axion decay constant $$f_a$$ f a and free scalar field mass $$\mu _f$$ μ f on the existence domain of the synchronized frequency $$\omega $$ ω .