Twin-peaked gravitational wave signal from a dark sector phase transition
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866917348673323008 |
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| author | Roshan, Rishav Saha, Indrajit |
| author_facet | Roshan, Rishav Saha, Indrajit |
| contents | We compute the gravitational wave spectrum from a dark sector phase transition driven by spontaneous $\ZDW$ breaking. If the transition is second-order, the only source of gravitational waves is the annihilation of domain walls (biased by quantum gravity). However, if the transition is first-order, this yields a twin-peaked signal from both the transition itself and the biased domain wall annihilation. Both scenarios originate when a scalar singlet odd under the $\ZDW$ obtains a non-zero vacuum expectation value. An additional $\ZDM$ odd scalar doublet strengthens the transition and produces fermionic dark matter via freeze-in, matching observed dark matter relic density. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_15829 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Twin-peaked gravitational wave signal from a dark sector phase transition Roshan, Rishav Saha, Indrajit High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics We compute the gravitational wave spectrum from a dark sector phase transition driven by spontaneous $\ZDW$ breaking. If the transition is second-order, the only source of gravitational waves is the annihilation of domain walls (biased by quantum gravity). However, if the transition is first-order, this yields a twin-peaked signal from both the transition itself and the biased domain wall annihilation. Both scenarios originate when a scalar singlet odd under the $\ZDW$ obtains a non-zero vacuum expectation value. An additional $\ZDM$ odd scalar doublet strengthens the transition and produces fermionic dark matter via freeze-in, matching observed dark matter relic density. |
| title | Twin-peaked gravitational wave signal from a dark sector phase transition |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2603.15829 |