Constraints on holographic QCD phase transitions from PTA observations

Abstract

The underlying physics of QCD phase transition in the early Universe remains largely unknown due to its strong-coupling nature during the quark-gluon plasma/hadron gas transition, yet a holographic model has been proposed to quantitatively fit the lattice QCD data while with its duration of the first-order phase transition (FoPT) left undetermined. At specific baryon chemical potential, the first-order QCD phase transition agrees with the observational constraint of baryon asymmetry. It, therefore, provides a scenario for phase transition gravitational waves (GWs) within the Standard Model of particle physics. If these background GWs could contribute dominantly to the recently claimed common-spectrum red noise from pulsar timing array (PTA) observations, the duration of this FoPT can be well constrained, and the associated primordial black holes are still allowed by current observations.

v1, 9 pages, 4 figures; v2, references added; v2, 10 pages, 4 figures, references updated, minor revision, accepted for publication in Sci. China Phys. Mech. Astron

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Cited by in corpus (12)

• Exploring the NANOGrav Signal and Planet-mass Primordial Black Holes through Higgs Inflation
• Realisation of the ultra-slow roll phase in Galileon inflation and PBH overproduction
• Slaying Axion-Like Particles via Gravitational Waves and Primordial Black Holes from Supercooled Phase Transition
• Can we distinguish the adiabatic fluctuations and isocurvature fluctuations with pulsar timing arrays?
• Untangling PBH overproduction in $w$-SIGWs generated by Pulsar Timing Arrays for MST-EFT of single field inflation
• Constraining the impact of standard model phase transitions on primordial black holes
• Revisiting holographic model for thermal and dense QCD with a critical point
• Transition rate and gravitational wave spectrum from first-order QCD phase transitions
• Dark Matter Spike surrounding Supermassive Black Holes Binary and the Nanohertz Stochastic Gravitational Wave Background
• Bubbles kick off primordial black holes to form more binaries
• Chiral phase transition: effective field theory and holography
• Numerical simulations of primordial black hole formation via delayed first-order phase transitions