# Effects of the QCD equation of state and lepton asymmetry on primordial gravitational waves

Hajkarim F, Schaffner-Bielich J, Wystub S, Wygas M (2019)
Physical Review D 99(10): 103527.

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Zeitschriftenaufsatz | Veröffentlicht | Englisch
Autor
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Einrichtung
Abstract / Bemerkung
Using the quantum chromodynamics (QCD) equation of state from lattice calculations we investigate effects from QCD on primordial gravitational waves produced during the inflationary era. We also consider different cases for vanishing and nonvanishing lepton asymmetry where the latter one is constrained by cosmic microwave background experiments. Our results show that there is up to a few percent deviation in the predicted gravitational wave background in the frequency range around the QCD transition (10(-10)-10(-7) Hz) for different lattice QCD equations of state, or at larger frequencies for nonvanishing lepton asymmetry using perturbative QCD. Future gravitational wave experiments with high enough sensitivity in the measurement of the amplitude of primordial gravitational waves like SKA, EPTA, DECIGO, and LISA can probe these differences and can shed light on the real nature of the cosmic QCD transition and the existence of a nonvanishing lepton asymmetry in the early Universe.
Erscheinungsjahr
Zeitschriftentitel
Physical Review D
Band
99
Ausgabe
10
Art.-Nr.
103527
ISSN
eISSN
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### Zitieren

Hajkarim F, Schaffner-Bielich J, Wystub S, Wygas M. Effects of the QCD equation of state and lepton asymmetry on primordial gravitational waves. Physical Review D. 2019;99(10): 103527.
Hajkarim, F., Schaffner-Bielich, J., Wystub, S., & Wygas, M. (2019). Effects of the QCD equation of state and lepton asymmetry on primordial gravitational waves. Physical Review D, 99(10), 103527. doi:10.1103/PhysRevD.99.103527
Hajkarim, F., Schaffner-Bielich, J., Wystub, S., and Wygas, M. (2019). Effects of the QCD equation of state and lepton asymmetry on primordial gravitational waves. Physical Review D 99:103527.
Hajkarim, F., et al., 2019. Effects of the QCD equation of state and lepton asymmetry on primordial gravitational waves. Physical Review D, 99(10): 103527.
F. Hajkarim, et al., “Effects of the QCD equation of state and lepton asymmetry on primordial gravitational waves”, Physical Review D, vol. 99, 2019, : 103527.
Hajkarim, F., Schaffner-Bielich, J., Wystub, S., Wygas, M.: Effects of the QCD equation of state and lepton asymmetry on primordial gravitational waves. Physical Review D. 99, : 103527 (2019).
Hajkarim, Fazlollah, Schaffner-Bielich, Jürgen, Wystub, Stephan, and Wygas, Mandy. “Effects of the QCD equation of state and lepton asymmetry on primordial gravitational waves”. Physical Review D 99.10 (2019): 103527.

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### Quellen

arXiv: 1904.01046

Inspire: 1727772