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arXiv · 2307.00044

Self-interacting dipolar boson stars and their dynamics

Pedro Ildefonso·Miguel Zilhão·Carlos Herdeiro·Eugen Radu·Nuno M. Santos
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Abstract

We construct and dynamically evolve dipolar, self-interacting scalar boson stars in a model with sextic (+ quartic) self-interactions. The domain of existence of such dipolar $Q$-stars has a similar structure to that of the fundamental monopolar stars of the same model. For the latter it is structured in a Newtonian plus a relativistic branch, wherein perturbatively stable solutions exist, connected by a middle unstable branch. Our evolutions support similar dynamical properties of the dipolar $Q$-stars that: 1) in the Newtonian and relativistic branches are dynamically robust over time scales longer than those for which dipolar stars without self-interactions are seen to decay; 2) in the middle branch migrate to either the Newtonian or the relativistic branch; 3) beyond the relativistic branch decay to black holes. Overall, these results strengthen the observation, seen in other contexts, that self-interactions can mitigate dynamical instabilities of scalar boson star models.

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Pedro Ildefonso, Miguel Zilhão, Carlos Herdeiro, Eugen Radu, Nuno M. Santos. 2023-06-30. Self-interacting dipolar boson stars and their dynamics. https://doi.org/10.1103/physrevd.108.064011

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