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Supercooled phase transitions in conformal dark sectors explain NANOGrav data

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arxiv 2501.11619 v3 pith:64OLQ4OV submitted 2025-01-20 hep-ph astro-ph.COhep-ex

João Gonçalves , Danny Marfatia , António P. Morais , Roman Pasechnik This is my paper · ORCID
classification hep-phastro-ph.COhep-ex
keywords darkexplainsupercooledconformalfoptsnanogravphasetransitions
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According to recent lore, it is difficult to explain the evidence for a stochastic gravitational wave background obtained by pulsar timing arrays with supercooled first-order phase transitions (FOPTs). We demonstrate that supercooled FOPTs in dark U(1)' models with a conformal dark sector easily explain the nHz signal at NANOGrav.

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Cited by 4 Pith papers

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    The one-loop over-the-barrier nucleation rate in a thermal QFT is Affleck’s formula generalized to fields, not Linde’s, and still carries quantum prefactor effects even when the bounce is classically symmetric.

  2. Can the universe be matter-dominated after a supercooled first-order phase transition?

    hep-ph 2026-07 conditional novelty 7.0 of 10

    After a supercooled first-order phase transition, the scalar field's equation of state is set by the bubble-wall Lorentz factor γ*, and matter domination is delayed until a/a* ≃ γ* in the free-streaming limit.

  3. Beyond the Daisy Chain: Running and the 3D EFT View of Supercooled Phase Transitions

    hep-ph 2025-11 conditional novelty 5.0 of 10

    With renormalisation-group running included, the one-loop high-temperature Daisy-resummed potential at µ=πT reproduces the phase-transition parameters of the two-loop dimensionally reduced EFT, while the no-running on...

  4. Can a secluded self-interacting dark sector generate detectable gravitational waves?

    hep-ph 2025-02 conditional novelty 4.0 of 10

    In a secluded self-interacting dark sector with a dark U(1)' and dark radiation, existing Neff and Lyman-alpha limits remove nearly all gravitational-wave-detectable parameter space; one charge assignment keeps a smal...

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