REVIEW 8 cited by
Does NANOGrav observe a dark sector phase transition?
Not yet reviewed by Pith; the record is open.
This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.
SPECIMEN: schema-true, not a live event
T0 review · schema-true
One-sentence machine reading of the paper's core claim.
pith:XXXXXXXX · record.json · timestamp
read the original abstract
Gravitational waves from a first-order cosmological phase transition, at temperatures at the MeV-scale, would arguably be the most exciting explanation of the common red spectrum reported by the NANOGrav collaboration, not the least because this would be direct evidence of physics beyond the standard model. Here we perform a detailed analysis of whether such an interpretation is consistent with constraints on the released energy deriving from big bang nucleosynthesis and the cosmic microwave background. We find that a phase transition in a completely secluded dark sector is strongly disfavoured with respect to the more conventional astrophysical explanation of the putative gravitational wave signal in terms of supermassive black hole binaries. On the other hand, a phase transition in a dark sector that subsequently decays, before the time of neutrino decoupling, remains an intriguing possibility to explain the data. From the model-building perspective, such an option is easily satisfied for couplings with the visible sector that are small enough to evade current collider and astrophysical constraints. The first indication that could eventually corroborate such an interpretation, once the observed common red spectrum is confirmed as a nHz gravitational wave background, could be the spectral tilt of the signal. In fact, the current data already show a very slight preference for a spectrum that is softer than what is expected from the leading astrophysical explanation.
Forward citations
Cited by 8 Pith papers
-
Quantum field nucleating and Wigner functions
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.
-
Can the universe be matter-dominated after a supercooled first-order phase transition?
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.
-
Boiling After the Dust Settles: Constraining First-Order Phase Transitions During Dark Energy Domination
CMB anisotropies from stochastic bubble nucleation constrain late-time phase transitions to release less than ~1% of dark energy when β/H⋆≲25, much tighter than Hubble-budget limits.
-
Domain Walls From Confining Bubbles: $SU(N_{c})$ Yang Mills at Finite $\theta$
A nonzero theta angle weakens supercooling in SU(Nc) Yang-Mills confinement and makes any resulting domain-wall gravitational-wave signal invisible except under severe fine-tuning.
-
Gravitational Waves from Dark Gauge Sectors
A dark SU(2) gauge sector that explains vector dark matter can produce LISA-detectable gravitational waves from a first-order phase transition, with a companion six-top signature at the HL-LHC.
-
Beyond the Daisy Chain: Running and the 3D EFT View of Supercooled Phase Transitions
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...
-
Implications for Pulsar Timing Arrays of Sub-solar Black Hole Detections: From LVK to Einstein Telescope and Cosmic Explorer
A Bayesian analysis shows that a future sub-solar PBH detection would make the primordial SIGW interpretation of PTA data favored over the SMBH interpretation, but this preference is driven by the detection prior.
-
Impact of Primordial Magnetic Fields on the First-Order Electroweak Phase Transition
A primordial hypermagnetic field slows the first-order electroweak transition, forms Higgs vortices above g'B/m_W^2 ~ 3.63, and helical fields boost sphaleron rates and baryon asymmetry.
Discussion (0). Sign in to comment.