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arXiv · 2505.07586

Primordial Black Holes and Gravitational Waves in Extensions of the Standard Model

Indra Kumar Banerjee·Ujjal Kumar Dey·Shaaban Khalil
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Abstract

We investigate the phenomenology of a Standard Model extension incorporating an inert scalar doublet and a gauged $U(1)_{B-L}$ symmetry. Our analysis reveals regions of the parameter space that support strong first-order phase transitions, including cases featuring two successive transitions. Each transition can generate a stochastic gravitational wave background within the sensitivity reach of upcoming experiments. Remarkably, the high-scale transition may also produce primordial black holes with appreciable abundance.

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Indra Kumar Banerjee, Ujjal Kumar Dey, Shaaban Khalil. 2025-05-12. Primordial Black Holes and Gravitational Waves in Extensions of the Standard Model. https://arxiv.org/abs/2505.07586

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