publication . Article . Other literature type . Preprint . 2019

Cosmology with A Very Light L$_{\mu}$ − L$_{\tau}$ Gauge Boson

Miguel Escudero; Dan Hooper; Gordan Krnjaic; Mathias Pierre;
Open Access English
  • Published: 01 Mar 2019
  • Publisher: HAL CCSD
In this paper, we explore in detail the cosmological implications of an abelian L − L gauge extension of the Standard Model featuring a light and weakly coupled Z′. Such a scenario is motivated by the longstanding ∼ 4σ discrepancy between the measured and predicted values of the muon’s anomalous magnetic moment, (g − 2) , as well as the tension between late and early time determinations of the Hubble constant. If sufficiently light, the Z′ population will decay to neutrinos, increasing the overall energy density of radiation and altering the expansion history of the early universe. We identify two distinct regions of parameter space in this model in which the Hu...
free text keywords: Z': coupling, space-time: expansion, gauge boson: abelian, Hubble constant, cosmological model, energy: density, muon: magnetic moment, radiation: density, neutrino: decoupling, Neutrino Physics, Beyond Standard Model, Cosmology of Theories beyond the SM, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798, High Energy Physics - Phenomenology, Astrophysics - Cosmology and Nongalactic Astrophysics, Nuclear and High Energy Physics, Gauge boson, Muon, Population, education.field_of_study, education, Particle physics, Neutrino, Hubble's law, symbols.namesake, symbols, Physics, Standard Model, Anomalous magnetic dipole moment, Neutrino decoupling
Funded by
The Elusives Enterprise: Asymmetries of the Invisible Universe
  • Funder: European Commission (EC)
  • Project Code: 674896
  • Funding stream: H2020 | MSCA-ITN-ETN
EC| InvisiblesPlus
  • Funder: European Commission (EC)
  • Project Code: 690575
  • Funding stream: H2020 | MSCA-RISE
Dark Matter and the Early Universe in the LHC Era
  • Funder: European Commission (EC)
  • Project Code: 648680
  • Funding stream: H2020 | ERC | ERC-COG

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