When feebly interacting massive particles decay into neutrinos: The N-eff story

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Standard

When feebly interacting massive particles decay into neutrinos : The N-eff story. / Boyarsky, Alexey; Ovchynnikov, Maksym; Sabti, Nashwan; Syvolap, Vsevolod.

I: Physical Review D, Bind 104, Nr. 3, 035006, 10.08.2021.

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt

Harvard

Boyarsky, A, Ovchynnikov, M, Sabti, N & Syvolap, V 2021, 'When feebly interacting massive particles decay into neutrinos: The N-eff story', Physical Review D, bind 104, nr. 3, 035006. https://doi.org/10.1103/PhysRevD.104.035006

APA

Boyarsky, A., Ovchynnikov, M., Sabti, N., & Syvolap, V. (2021). When feebly interacting massive particles decay into neutrinos: The N-eff story. Physical Review D, 104(3), [035006]. https://doi.org/10.1103/PhysRevD.104.035006

Vancouver

Boyarsky A, Ovchynnikov M, Sabti N, Syvolap V. When feebly interacting massive particles decay into neutrinos: The N-eff story. Physical Review D. 2021 aug. 10;104(3). 035006. https://doi.org/10.1103/PhysRevD.104.035006

Author

Boyarsky, Alexey ; Ovchynnikov, Maksym ; Sabti, Nashwan ; Syvolap, Vsevolod. / When feebly interacting massive particles decay into neutrinos : The N-eff story. I: Physical Review D. 2021 ; Bind 104, Nr. 3.

Bibtex

@article{d7c3b15e8da344b39cd08c258ff2e529,
title = "When feebly interacting massive particles decay into neutrinos: The N-eff story",
abstract = "The existence of feebly interacting massive particles (FIMPs) could have significant implications on the effective number of relativistic species N-eff in the early Universe. In this work, we investigate in detail how short-lived FIMPs that can decay into neutrinos affect N-eff and highlight the relevant effects that govern its evolution. We show that even if unstable FIMPs inject most of their energy into neutrinos, they may still decrease N-eff, and identify neutrino spectral distortions as the driving power behind this effect. As a case study, we consider heavy neutral leptons (HNLs) and indicate which regions of their parameter space increase or decrease Neff. Moreover, we derive bounds on the HNL lifetime from the cosmic microwave background and comment on the possible role that HNLs could play in alleviating the Hubble tension.",
keywords = "BIG-BANG NUCLEOSYNTHESIS, DARK-MATTER, STERILE NEUTRINO, BOUNDS, VMSM",
author = "Alexey Boyarsky and Maksym Ovchynnikov and Nashwan Sabti and Vsevolod Syvolap",
year = "2021",
month = aug,
day = "10",
doi = "10.1103/PhysRevD.104.035006",
language = "English",
volume = "104",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "3",

}

RIS

TY - JOUR

T1 - When feebly interacting massive particles decay into neutrinos

T2 - The N-eff story

AU - Boyarsky, Alexey

AU - Ovchynnikov, Maksym

AU - Sabti, Nashwan

AU - Syvolap, Vsevolod

PY - 2021/8/10

Y1 - 2021/8/10

N2 - The existence of feebly interacting massive particles (FIMPs) could have significant implications on the effective number of relativistic species N-eff in the early Universe. In this work, we investigate in detail how short-lived FIMPs that can decay into neutrinos affect N-eff and highlight the relevant effects that govern its evolution. We show that even if unstable FIMPs inject most of their energy into neutrinos, they may still decrease N-eff, and identify neutrino spectral distortions as the driving power behind this effect. As a case study, we consider heavy neutral leptons (HNLs) and indicate which regions of their parameter space increase or decrease Neff. Moreover, we derive bounds on the HNL lifetime from the cosmic microwave background and comment on the possible role that HNLs could play in alleviating the Hubble tension.

AB - The existence of feebly interacting massive particles (FIMPs) could have significant implications on the effective number of relativistic species N-eff in the early Universe. In this work, we investigate in detail how short-lived FIMPs that can decay into neutrinos affect N-eff and highlight the relevant effects that govern its evolution. We show that even if unstable FIMPs inject most of their energy into neutrinos, they may still decrease N-eff, and identify neutrino spectral distortions as the driving power behind this effect. As a case study, we consider heavy neutral leptons (HNLs) and indicate which regions of their parameter space increase or decrease Neff. Moreover, we derive bounds on the HNL lifetime from the cosmic microwave background and comment on the possible role that HNLs could play in alleviating the Hubble tension.

KW - BIG-BANG NUCLEOSYNTHESIS

KW - DARK-MATTER

KW - STERILE NEUTRINO

KW - BOUNDS

KW - VMSM

U2 - 10.1103/PhysRevD.104.035006

DO - 10.1103/PhysRevD.104.035006

M3 - Journal article

VL - 104

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 3

M1 - 035006

ER -

ID: 276377577