The dispirited case of gauged U(1)B − L dark matter

Escudero, Miguel; Witte, Samuel J.; Rius, Nuria

doi:10.1007/jhep08(2018)190

Cited by 43 publications

(42 citation statements)

References 88 publications

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“…The bounds derived for BSM species that annihilate into electrons and neutrinos with different ratios are, for instance, relevant for scenarios involving a gauging of SM global symmetries such as U (1) Lµ−Lτ [32,142,143] or U (1) B−L [144,145]. Finally, these bounds also apply to asymmetric dark matter sectors interacting with SM species [146,147].…”

Section: Vii1 Particle Physics Scenariosmentioning

confidence: 95%

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

Sabti

Alvey

Escudero

et al. 2020

J. Cosmol. Astropart. Phys.

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187

174

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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 2σ. 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 2σ. 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. S nashwan.sabti@kcl.ac.uk

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Section: Vii1 Particle Physics Scenariosmentioning

confidence: 95%

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

Sabti

Alvey

Escudero

et al. 2020

J. Cosmol. Astropart. Phys.

Self Cite

187

174

View full text Add to dashboard Cite

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“…The bounds derived for WIMPs that annihilate to both electrons and neutrinos are Y p = 0.245 ± 0.006 (95% CL) Constraints e : ν B, g = 1 B, g = 2 F, g = 2 B, g = 3 F, g = 4 relevant for various physically well motivated scenarios. For instance, a dark matter particle charged under a gauged U (1) B−L symmetry will annihilate to electrons and neutrinos at a similar rate [77,78]. Also, some neutrinophilic dark matter candidates do have small (10 −5 −10 −4 ) but non-negligible annihilations to electrons, as in the case of dark matter within a U (1) µ−τ gauge symmetry [79] or in scenarios with mixing between active and sterile neutrino states [80].…”

Section: Resultsmentioning

confidence: 99%

Neutrino decoupling beyond the Standard Model: CMB constraints on the Dark Matter mass with a fast and precise N_eff evaluation

Escudero

2019

J. Cosmol. Astropart. Phys.

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148

196

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The number of effective relativistic neutrino species represents a fundamental probe of the thermal history of the early Universe, and as such of the Standard Model of Particle Physics. Traditional approaches to the process of neutrino decoupling are either very technical and computationally expensive, or assume that neutrinos decouple instantaneously. In this work, we aim to fill the gap between these two approaches by modeling neutrino decoupling in terms of two simple coupled differential equations for the electromagnetic and neutrino sector temperatures, in which all the relevant interactions are taken into account and which allows for a straightforward implementation of BSM species. Upon including finite temperature QED corrections we reach an accuracy on N eff in the SM of 0.01. We illustrate the usefulness of this approach to neutrino decoupling by considering, in a model independent manner, the impact of MeV thermal dark matter on N eff . We show that Planck rules out electrophilic and neutrinophilic thermal dark matter particles of m < 3.0 MeV at 95% CL regardless of their spin, and of their annihilation being s-wave or p-wave. We point out that thermal dark matter particles with non-negligible interactions with both electrons and neutrinos are more elusive to CMB observations than purely electrophilic or neutrinophilic ones. In addition, assisted by the accuracy of our approach, we show that CMB Stage-IV experiments will generically test thermal dark matter particles with m 15 MeV. We make publicly available the codes developed for this study at https://github.com/MiguelEA/ nudec_BSM.

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“…For the above estimate we adopted a conservative bound, m Z 4 TeV, suggested by the current Z searches for g B−L 10 −1 [75,76,83]. The impact of future experiments on this bound can be gauged by considering the prospects for sequential Z models at collider with increased luminosity or center of mass energy.…”

Section: Phenomenological Consequencesmentioning

confidence: 99%

Phase transition and vacuum stability in the classically conformal B–L model

2019

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Within classically conformal models, the spontaneous breaking of scale invariance is usually associated to a strong first order phase transition that results in a gravitational wave background within the reach of future space-based interferometers. In this paper we study the case of the classically conformal gauged B-L model, analysing the impact of this minimal extension of the Standard Model on the dynamics of the electroweak symmetry breaking and derive its gravitational wave signature. Particular attention is paid to the problem of vacuum stability and to the role of the QCD phase transition, which we prove responsible for concluding the symmetry breaking transition in part of the considered parameter space. Finally, we calculate the gravitational wave signal emitted in the process, finding that a large part of the parameter space of the model can be probed by LISA. * carlo.marzo@kbfi.ee † luca.marzola@cern.ch ‡ ville.vaskonen@kcl.ac.uk 1 We refer the reader to for analyses of non-conformal B-L models.

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The dispirited case of gauged U(1)B − L dark matter

Cited by 43 publications

References 88 publications

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

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

Neutrino decoupling beyond the Standard Model: CMB constraints on the Dark Matter mass with a fast and precise N_eff evaluation

Phase transition and vacuum stability in the classically conformal B–L model

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The dispirited case of gauged U(1)B − L dark matter

Cited by 43 publications

References 88 publications

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

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

Neutrino decoupling beyond the Standard Model: CMB constraints on the Dark Matter mass with a fast and precise Neff evaluation

Phase transition and vacuum stability in the classically conformal B–L model

Contact Info

Product

Resources

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Neutrino decoupling beyond the Standard Model: CMB constraints on the Dark Matter mass with a fast and precise N_eff evaluation