Local clustering of relic neutrinos: comparison of kinetic field theory and the Vlasov equation

Holm EB, Zentarra S, Oldengott IM (2024)
Journal of Cosmology and Astroparticle Physics (7): 050.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Autor*in
Holm, Emil Brinch; Zentarra, Stefan; Oldengott, Isabel MiraUniBi
Abstract / Bemerkung
Gravitational clustering in our cosmic vicinity is expected to lead to an enhancement of the local density of relic neutrinos. We derive expressions for the neutrino density, using a perturbative approach to kinetic field theory and perturbative solutions of the Vlasov equation up to second order. Our work reveals that both formalisms give exactly the same results and can thus be considered equivalent. Numerical evaluation of the local relic neutrino density at first and second order provides some fundamental insights into the frequently applied approach of linear response to neutrino clustering (also known as the Gilbert equation). Against the naive expectation, including the second-order contribution does not lead to an improvement of the prediction for the local relic neutrino density but to a dramatic overestimation. This is because perturbation theory breaks down in a momentum-dependent fashion and in particular for densities well below unity.
Stichworte
cosmological neutrinos; cosmological simulations; neutrino experiments
Erscheinungsjahr
2024
Zeitschriftentitel
Journal of Cosmology and Astroparticle Physics
Ausgabe
7
Art.-Nr.
050
eISSN
1475-7516
Finanzierungs-Informationen
Open-Access-Publikationskosten wurden durch die Universität Bielefeld gefördert.
Page URI
https://pub.uni-bielefeld.de/record/2991989

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Holm EB, Zentarra S, Oldengott IM. Local clustering of relic neutrinos: comparison of kinetic field theory and the Vlasov equation. Journal of Cosmology and Astroparticle Physics . 2024;(7): 050.
Holm, E. B., Zentarra, S., & Oldengott, I. M. (2024). Local clustering of relic neutrinos: comparison of kinetic field theory and the Vlasov equation. Journal of Cosmology and Astroparticle Physics (7), 050. https://doi.org/10.1088/1475-7516/2024/07/050
Holm, Emil Brinch, Zentarra, Stefan, and Oldengott, Isabel Mira. 2024. “Local clustering of relic neutrinos: comparison of kinetic field theory and the Vlasov equation”. Journal of Cosmology and Astroparticle Physics , no. 7: 050.
Holm, E. B., Zentarra, S., and Oldengott, I. M. (2024). Local clustering of relic neutrinos: comparison of kinetic field theory and the Vlasov equation. Journal of Cosmology and Astroparticle Physics :050.
Holm, E.B., Zentarra, S., & Oldengott, I.M., 2024. Local clustering of relic neutrinos: comparison of kinetic field theory and the Vlasov equation. Journal of Cosmology and Astroparticle Physics , (7): 050.
E.B. Holm, S. Zentarra, and I.M. Oldengott, “Local clustering of relic neutrinos: comparison of kinetic field theory and the Vlasov equation”, Journal of Cosmology and Astroparticle Physics , 2024, : 050.
Holm, E.B., Zentarra, S., Oldengott, I.M.: Local clustering of relic neutrinos: comparison of kinetic field theory and the Vlasov equation. Journal of Cosmology and Astroparticle Physics . : 050 (2024).
Holm, Emil Brinch, Zentarra, Stefan, and Oldengott, Isabel Mira. “Local clustering of relic neutrinos: comparison of kinetic field theory and the Vlasov equation”. Journal of Cosmology and Astroparticle Physics 7 (2024): 050.
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2025-01-21T09:54:42Z
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