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arXiv · 2506.22248

Phase transitions and gravitational waves in a non-abelian vector dark matter scenario

Nico Benincasa·Luigi Delle Rose·Luca Panizzi·Maimoona Razzaq·Savio Urzetta
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Abstract

We study a scenario where the Standard Model is extended by a SU(2) gauge group in the dark sector. The three associated dark gauge bosons are stabilised via a custodial symmetry triggered by an additional dark SU(2) scalar doublet, thus making them viable dark-matter candidates. After considering the most recent constraints for this model, we analyse the phase transition dynamics and compute the power spectrum of resulting stochastic gravitational-wave background. Finally, we find regions of the parameter space yielding the observed dark-matter relic density while also leading to strong enough phase transition with an associated gravitational-wave signal reaching the sensitivity of future space-based gravitational-wave detector, such as LISA, DECIGO, BBO, TianQin or Taiji.

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Nico Benincasa, Luigi Delle Rose, Luca Panizzi, Maimoona Razzaq, Savio Urzetta. 2025-06-27. Phase transitions and gravitational waves in a non-abelian vector dark matter scenario. https://arxiv.org/abs/2506.22248

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