The effects of QCD equation of state on the relic density of WIMP dark matter M Drees, F Hajkarim, ER Schmitz Journal of Cosmology and Astroparticle Physics 2015 (06), 025, 2015 | 105 | 2015 |

Dark matter production in an early matter dominated era M Drees, F Hajkarim Journal of Cosmology and Astroparticle Physics 2018 (02), 057, 2018 | 47* | 2018 |

Primordial gravitational waves in nonstandard cosmologies N Bernal, F Hajkarim Physical Review D 100 (6), 063502, 2019 | 37 | 2019 |

Neutralino dark matter in scenarios with early matter domination M Drees, F Hajkarim Journal of High Energy Physics 2018 (12), 1-28, 2018 | 34 | 2018 |

Thermal history of the early Universe and primordial gravitational waves from induced scalar perturbations F Hajkarim, J Schaffner-Bielich Physical Review D 101 (4), 043522, 2020 | 32 | 2020 |

Stability of Einstein static universe over Lyra geometry F Darabi, Y Heydarzade, F Hajkarim Canadian Journal of Physics 93 (12), 1566-1570, 2015 | 24 | 2015 |

Shedding new light on sterile neutrinos from XENON1T experiment S Soroush, H Fazlollah, X She-Sheng Journal of High Energy Physics 2020 (12), 2020 | 10* | 2020 |

Effects of the QCD equation of state and lepton asymmetry on primordial gravitational waves S Wystub, MM Wygas, F Hajkarim, J Schaffner-Bielich Physical Review D 99 (arXiv: 1904.01046), 2019 | 10* | 2019 |

Pion condensation in the early universe at nonvanishing lepton flavor asymmetry and its gravitational wave signatures V Vovchenko, BB Brandt, F Cuteri, G Endrődi, F Hajkarim, ... Physical Review Letters 126 (1), 012701, 2021 | 6 | 2021 |

Primordial gravitational wave signals in modified cosmologies N Bernal, A Ghoshal, F Hajkarim, G Lambiase Journal of Cosmology and Astroparticle Physics 2020 (11), 051, 2020 | 5 | 2020 |

On the viability of Planck scale cosmology with quartessence M Khodadi, K Nozari, F Hajkarim The European Physical Journal C 78 (9), 1-12, 2018 | 5 | 2018 |

Thermal QCD Axions across Thresholds F D'Eramo, F Hajkarim, S Yun arXiv preprint arXiv:2108.05371, 2021 | 1 | 2021 |

Thermal axion production at low temperatures: a smooth treatment of the QCD phase transition F D'Eramo, F Hajkarim, S Yun arXiv preprint arXiv:2108.04259, 2021 | 1 | 2021 |

Axion Dark Matter in the Time of Primordial Black Holes N Bernal, F Hajkarim, Y Xu arXiv preprint arXiv:2107.13575, 2021 | 1 | 2021 |

Production of Dark Matter in Cosmological Models with Low Reheating Temperature F Hajkarim Universitäts-und Landesbibliothek Bonn, 2018 | | 2018 |