Deconfinement Transition Effects on Cosmological Parameters and Primordial Gravitational Wave Spectrum
arXiv:1804.04989 · doi:10.1103/PhysRevD.98.023007
Abstract
The cosmological evolution can be described in terms of directly measurable cosmological scalar parameters (deceleration , jerk , snap , etc...) constructed out of high order derivatives of the scale factor. Their behavior at the critical temperature of the Quantum Chromodynamics (QCD) phase transition in early universe could be a specific tool to study the transition, analogously to the fluctuations of conserved charges in QCD. We analyze the effect of the crossover transition from quarks and gluons to hadrons in early universe on the cosmological scalars and on the gravitational wave spectrum, by using the recent lattice QCD equation of state and including the electroweak degrees of freedom and different models of dark matter. Near the transition the cosmological parameters follow the behavior of QCD trace anomaly and of the speed of sound of the entire system. The effects of deconfinement turn out to be more relevant for the modification of the primordial spectrum of gravitational waves and our complete analysis, based on lattice QCD simulations and on the hadron resonance gas below the critical temperature, refines previous results.
arXiv comment13 pages,13 figures
References in corpus (20)
- Planck 2015 results. XIII. Cosmological parameters
- The equation of state in (2+1)-flavor QCD
- Full result for the QCD equation of state with 2+1 flavors
- Interferometer design of the KAGRA gravitational wave detector
- The QCD equation of state with dynamical quarks
- Gravitational Radiation from First-Order Phase Transitions
- Jerk, snap, and the cosmological equation of state
- QCD Equation of State and Hadron Resonance Gas
- Fluctuations and Correlations of net baryon number, electric charge, and strangeness: A comparison of lattice QCD results with the hadron resonance gas model
- Improved Calculation of the Primordial Gravitational Wave Spectrum in the Standard Model
- Hadron Resonance Mass Spectrum and Lattice QCD Thermodynamics
- IndIGO and LIGO-India: Scope and Plans for Gravitational Wave Research and Precision Metrology in India
- The first second of the Universe
- Cosmic Jerk, Snap and Beyond
- Evolution of gravitational waves through the cosmological QCD transition
- Imprints of the QCD Phase Transition on the Spectrum of Gravitational Waves
- Conserved charge fluctuations at vanishing and non-vanishing chemical potential
- The realistic QCD equation of state in relativistic heavy-ion collisions and the early Universe
- QCD Equation of State and Cosmological Parameters in Early Universe
- Energy density fluctuations in Early Universe
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- Resolution of the cosmological constant problem by unimodular gravity and signature reversal symmetry
- Finite temperature QCD crossover at non-zero chemical potential: A Dyson-Schwinger approach