Imprints of Early Universe on Gravitational Waves from First-Order Phase Transition in QCD

TL;DR

This paper investigates the gravitational wave signals generated during the QCD phase transition in the early universe, using holographic models, and assesses their detectability by current and future observatories.

Contribution

It provides a detailed analysis of gravitational wave spectra from QCD phase transitions in holographic models, including various transition modes and parameter regimes.

Findings

Detectable gravitational wave signals for large chemical potentials.

Distinct spectra for deflagration, detonation, and runaway cases.

Potential observation by EPTA/IPTA and eLISA for certain parameters.

Abstract

We study the gravitational wave spectrum from the confinement-deconfinement phase transi-tion in the holographic QCD models for both light quark and heavy quark. We obtain the gravitationalwave spectrum in the deflagration, detonation and runaway cases for different chemical potentials and duration of the phase transition. We find that the gravitational wave spectrum could be observed by EPTA/IPTA and eLISA for large chemical potential and short duartion of phase transtions.