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Refined bounds on MeV-scale thermal dark sectors from BBN and the CMB

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Refined bounds on MeV-scale thermal dark sectors from BBN and the CMB. / Sabti, Nashwan; Alvey, James; Escudero, Miguel; Fairbairn, Malcolm; Blas, Diego.

In: Journal of Cosmology and Astroparticle Physics, Vol. 2020, No. 1, 004, 02.01.2020.

Research output: Contribution to journalArticlepeer-review

Harvard

Sabti, N, Alvey, J, Escudero, M, Fairbairn, M & Blas, D 2020, 'Refined bounds on MeV-scale thermal dark sectors from BBN and the CMB', Journal of Cosmology and Astroparticle Physics, vol. 2020, no. 1, 004. https://doi.org/10.1088/1475-7516/2020/01/004

APA

Sabti, N., Alvey, J., Escudero, M., Fairbairn, M., & Blas, D. (2020). Refined bounds on MeV-scale thermal dark sectors from BBN and the CMB. Journal of Cosmology and Astroparticle Physics, 2020(1), [004]. https://doi.org/10.1088/1475-7516/2020/01/004

Vancouver

Sabti N, Alvey J, Escudero M, Fairbairn M, Blas D. Refined bounds on MeV-scale thermal dark sectors from BBN and the CMB. Journal of Cosmology and Astroparticle Physics. 2020 Jan 2;2020(1). 004. https://doi.org/10.1088/1475-7516/2020/01/004

Author

Sabti, Nashwan ; Alvey, James ; Escudero, Miguel ; Fairbairn, Malcolm ; Blas, Diego. / Refined bounds on MeV-scale thermal dark sectors from BBN and the CMB. In: Journal of Cosmology and Astroparticle Physics. 2020 ; Vol. 2020, No. 1.

Bibtex Download

@article{41210f4ad1e84eaa8c5611891b4e77d7,
title = "Refined bounds on MeV-scale thermal dark sectors from BBN and the CMB",
abstract = "New light states thermally coupled to the Standard Model plasma alter the expansion history of the Universe and impact the synthesis of the primordial light elements. In this work, we carry out an exhaustive and precise analysis of the implications of MeV-scale BSM particles in Big Bang Nucleosynthesis (BBN) and for Cosmic Microwave Background (CMB) observations. We find that BBN observations set a lower bound on the thermal dark matter mass of mχ > 0.4 MeV at 2s. This bound is independent of the spin and number of internal degrees of freedom of the particle, of the annihilation being s-wave or p-wave, and of the annihilation final state. Furthermore, we show that current BBN plus CMB observations constrain purely electrophilic and neutrinophilic BSM species to have a mass, mχ > 3.7 MeV at 2s. We explore the reach of future BBN measurements and show that upcoming CMB missions should improve the bounds on light BSM thermal states to mχ > (10 - 15) MeV. Finally, we demonstrate that very light BSM species thermally coupled to the SM plasma are highly disfavoured by current cosmological observations.",
keywords = "Big bang nucleosynthesis, Cosmology of theories beyond the SM, Dark matter theory, Particle physics - cosmology connection",
author = "Nashwan Sabti and James Alvey and Miguel Escudero and Malcolm Fairbairn and Diego Blas",
year = "2020",
month = jan,
day = "2",
doi = "10.1088/1475-7516/2020/01/004",
language = "English",
volume = "2020",
journal = "Journal of Cosmology and Astroparticle Physics",
issn = "1475-7516",
publisher = "IOP Publishing",
number = "1",

}

RIS (suitable for import to EndNote) Download

TY - JOUR

T1 - Refined bounds on MeV-scale thermal dark sectors from BBN and the CMB

AU - Sabti, Nashwan

AU - Alvey, James

AU - Escudero, Miguel

AU - Fairbairn, Malcolm

AU - Blas, Diego

PY - 2020/1/2

Y1 - 2020/1/2

N2 - New light states thermally coupled to the Standard Model plasma alter the expansion history of the Universe and impact the synthesis of the primordial light elements. In this work, we carry out an exhaustive and precise analysis of the implications of MeV-scale BSM particles in Big Bang Nucleosynthesis (BBN) and for Cosmic Microwave Background (CMB) observations. We find that BBN observations set a lower bound on the thermal dark matter mass of mχ > 0.4 MeV at 2s. This bound is independent of the spin and number of internal degrees of freedom of the particle, of the annihilation being s-wave or p-wave, and of the annihilation final state. Furthermore, we show that current BBN plus CMB observations constrain purely electrophilic and neutrinophilic BSM species to have a mass, mχ > 3.7 MeV at 2s. We explore the reach of future BBN measurements and show that upcoming CMB missions should improve the bounds on light BSM thermal states to mχ > (10 - 15) MeV. Finally, we demonstrate that very light BSM species thermally coupled to the SM plasma are highly disfavoured by current cosmological observations.

AB - New light states thermally coupled to the Standard Model plasma alter the expansion history of the Universe and impact the synthesis of the primordial light elements. In this work, we carry out an exhaustive and precise analysis of the implications of MeV-scale BSM particles in Big Bang Nucleosynthesis (BBN) and for Cosmic Microwave Background (CMB) observations. We find that BBN observations set a lower bound on the thermal dark matter mass of mχ > 0.4 MeV at 2s. This bound is independent of the spin and number of internal degrees of freedom of the particle, of the annihilation being s-wave or p-wave, and of the annihilation final state. Furthermore, we show that current BBN plus CMB observations constrain purely electrophilic and neutrinophilic BSM species to have a mass, mχ > 3.7 MeV at 2s. We explore the reach of future BBN measurements and show that upcoming CMB missions should improve the bounds on light BSM thermal states to mχ > (10 - 15) MeV. Finally, we demonstrate that very light BSM species thermally coupled to the SM plasma are highly disfavoured by current cosmological observations.

KW - Big bang nucleosynthesis

KW - Cosmology of theories beyond the SM

KW - Dark matter theory

KW - Particle physics - cosmology connection

UR - http://www.scopus.com/inward/record.url?scp=85080098984&partnerID=8YFLogxK

U2 - 10.1088/1475-7516/2020/01/004

DO - 10.1088/1475-7516/2020/01/004

M3 - Article

AN - SCOPUS:85080098984

VL - 2020

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

SN - 1475-7516

IS - 1

M1 - 004

ER -

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